Upload 150 files

.gitattributes

@@ -33,3 +33,5 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+assets/scramjet.png filter=lfs diff=lfs merge=lfs -text
+rewriter/native/flamegraph.svg filter=lfs diff=lfs merge=lfs -text

.github/workflows/main.yml

@@ -0,0 +1,226 @@
+name: CI
+
+on:
+  push:
+    paths-ignore:
+      - ".github/workflows/**"
+  pull_request:
+    paths-ignore:
+      - ".github/workflows/**"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: Build Scramjet
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "pnpm"
+
+      - name: Install pnpm dependencies
+        run: pnpm install
+
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "rewriter"
+          cache-all-crates: true
+
+      - name: Install wbg
+        uses: jetli/[email protected]
+        with:
+          version: "0.2.100"
+
+      - name: Setup Binaryen
+        uses: Aandreba/[email protected]
+        with:
+          token: ${{ github.token }}
+
+      - name: Setup wasm-snip
+        run: "cargo install --git https://github.com/r58playz/wasm-snip"
+
+      - name: Pack Scramjet
+        run: pnpm pack
+
+      - name: Upload Artifact (pnpm pack)
+        uses: actions/upload-artifact@v4
+        with:
+          name: packaged-scramjet
+          path: mercuryworkshop-scramjet-*.tgz
+
+      - name: Upload Artifact (dist)
+        uses: actions/upload-artifact@v4
+        with:
+          name: scramjet
+          path: |
+            dist/*.js
+            dist/*.js.map
+            dist/*.wasm
+  tests:
+    name: Run Scramjet Tests
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Get artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: scramjet
+          path: dist
+
+      - name: Install Playwright Browsers
+        run: npx playwright install --with-deps
+
+      - name: Run Playwright tests
+        run: pnpm test
+
+  upload:
+    name: Upload release
+    runs-on: ubuntu-latest
+    needs: [build, tests]
+    permissions: write-all
+    if: github.ref == 'refs/heads/main'
+
+    steps:
+      - name: Delete old release and tag
+        uses: dev-drprasad/[email protected]
+        with:
+          delete_release: true
+          tag_name: latest
+          github_token: ${{ github.token }}
+
+      - name: Get artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: packaged-scramjet
+          path: .
+
+      - name: Release to GitHub
+        uses: ncipollo/release-action@v1
+        with:
+          name: Continuous Build
+          tag: latest
+          commit: main
+          body: "${{ github.event.head_commit.url }} ${{ github.event.head_commit.message }}"
+          artifacts: "mercuryworkshop-scramjet-*.tgz"
+          prerelease: true
+
+  publish:
+    name: Publish Scramjet to NPM
+    runs-on: ubuntu-latest
+    needs: [build, tests]
+    if: false
+    permissions: write-all
+    steps:
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          registry-url: "https://registry.npmjs.org"
+
+      - name: Get artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: packaged-scramjet
+          path: .
+
+      - name: Extract package
+        run: tar xvf mercuryworkshop-scramjet-*.tgz package --strip-components=1
+
+      - name: Check the version
+        id: check
+        run: |
+          CURRENT_VERSION=$(jq -r .version package.json)
+          echo "Current version: $CURRENT_VERSION"
+          LATEST_VERSION=$(npm view @mercuryworkshop/scramjet version || echo "0.0.0")
+          echo "Latest NPM version: $LATEST_VERSION"
+
+          if [ "$LATEST_VERSION" != "$CURRENT_VERSION" ]; 
+          then
+            echo "Version changed"
+            echo "version_changed=true" >> $GITHUB_OUTPUT
+            echo "new_version=$CURRENT_VERSION" >> $GITHUB_OUTPUT
+          else
+            echo "Version not changed"
+            echo "version_changed=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Publish
+        if: steps.check.outputs.version_changed == 'true'
+        run: npm publish --access public --no-git-checks
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+
+  pages:
+    name: Upload to Github Pages
+    runs-on: ubuntu-latest
+    needs: [build, tests]
+    permissions: write-all
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Get artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: scramjet
+          path: dist
+
+      - name: build statics
+        run: bash ./ci/buildstatic.sh
+
+      - name: upload pages artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: "./staticbuild"
+
+      - name: deploy to github
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/wpt_diff_epoch.yml

@@ -0,0 +1,345 @@
+name: WPT Test Results
+
+on:
+  schedule:
+    # Every night at 0:30 UTC
+    - cron: "30 0 * * *"
+  workflow_dispatch:
+    inputs:
+      shard_count:
+        description: "Number of shards to run"
+        required: false
+        default: "2"
+        type: string
+      max_tests:
+        description: "Maximum total number of tests (divided across shards)"
+        required: false
+        default: ""
+        type: string
+      skip_combiner:
+        description: "Skip the report combination step"
+        required: false
+        default: false
+        type: boolean
+
+jobs:
+  check-changes:
+    name: Check for changes
+    runs-on: ubuntu-latest
+    outputs:
+      should-run: ${{ steps.check.outputs.should-run }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+
+      - name: Check for recent changes
+        id: check
+        run: |
+          # Check if there were any commits in the last day
+          SCRAMJET_CHANGED=$(git log --since="24 hours ago" --oneline | wc -l)
+
+          # Check WPT-diff repo
+          git clone --shallow-since="24 hours ago" https://github.com/MercuryWorkshop/WPT-diff.git wpt-diff-check
+          cd wpt-diff-check
+          WPTDIFF_CHANGED=$(git log --since="24 hours ago" --oneline | wc -l)
+          cd ..
+
+          # Check WPT upstream
+          # They are always committing (it must be the final hours of the world when they don't)
+          git clone --shallow-since="24 hours ago" https://github.com/web-platform-tests/wpt.git wpt-check
+          cd wpt-check
+          WPT_CHANGED=$(git log --since="24 hours ago" --oneline | wc -l)
+          cd ..
+
+          # Run tests if any repo has changes or if manually triggered
+          if [ "$SCRAMJET_CHANGED" -gt 0 ] || [ "$WPTDIFF_CHANGED" -gt 0 ] || [ "$WPT_CHANGED" -gt 0 ] || [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+            echo "should-run=true" >> "$GITHUB_OUTPUT"
+            echo "Changes detected or manually triggered (will run tests)"
+          else
+            echo "should-run=false" >> "$GITHUB_OUTPUT"
+            echo "No changes detected (skipping tests)"
+          fi
+
+  build-scramjet:
+    name: Build Scramjet
+    runs-on: ubuntu-latest
+    needs: check-changes
+    if: needs.check-changes.outputs.should-run == 'true'
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Cache Rust dependencies
+        uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: "rewriter"
+          cache-all-crates: true
+          env-vars: "CARGO CC CFLAGS CXX CMAKE RUST WASM_BINDGEN"
+          cache-targets: true
+          cache-bin: true
+
+      - name: Setup Rust toolchain
+        run: |
+          cd rewriter
+          rustup show
+
+      - name: Install wbg
+        uses: jetli/[email protected]
+        with:
+          version: 0.2.100
+
+      - name: Setup binaryen
+        uses: Aandreba/[email protected]
+        with:
+          token: ${{ github.token }}
+
+      - name: Install wasm-snip
+        run: cargo install --git https://github.com/r58playz/wasm-snip
+
+      - name: Pack Scramjet
+        run: pnpm pack
+
+      - name: Upload artifact (pnpm pack)
+        uses: actions/upload-artifact@v4
+        with:
+          name: packaged-scramjet
+          path: mercuryworkshop-scramjet-*.tgz
+
+      - name: Upload artifact (dist)
+        uses: actions/upload-artifact@v4
+        with:
+          name: scramjet-dist
+          path: |
+            dist/*.js
+            dist/*.js.map
+            dist/*.wasm
+
+  generate-matrix:
+    name: Generate shard matrix
+    runs-on: ubuntu-latest
+    needs: check-changes
+    if: needs.check-changes.outputs.should-run == 'true'
+    outputs:
+      shards: ${{ steps.generate.outputs.shards }}
+    steps:
+      - name: Generate shard list
+        id: generate
+        run: |
+          SHARD_COUNT="${{ github.event.inputs.shard_count || '2' }}"
+          SHARDS=$(seq -s'", "' 1 $SHARD_COUNT)
+          echo "shards=[\"$SHARDS\"]" >> "$GITHUB_OUTPUT"
+
+  run-wpt-tests:
+    name: WPT tests (shard ${{ matrix.shard }})
+    runs-on: ubuntu-latest
+    needs: [build-scramjet, generate-matrix]
+    timeout-minutes: 350
+    strategy:
+      matrix:
+        shard: ${{ fromJson(needs.generate-matrix.outputs.shards) }}
+      fail-fast: false
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Download build artifacts
+        uses: actions/download-artifact@v4
+        with:
+          name: scramjet-dist
+          path: dist
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: latest
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: latest
+          cache: pnpm
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Checkout WPT-diff
+        uses: actions/checkout@v4
+        with:
+          repository: MercuryWorkshop/WPT-diff
+          path: wpt-diff
+
+      - name: Checkout WPT
+        uses: actions/checkout@v4
+        with:
+          repository: web-platform-tests/wpt
+          ref: epochs/daily
+          path: wpt-diff/wpt
+          fetch-depth: 1
+
+      - name: Setup WPT hosts
+        run: |
+          cd wpt-diff/wpt
+          ./wpt make-hosts-file | sudo tee -a /etc/hosts
+
+      - name: Restore Playwright browsers cache
+        id: playwright-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: |
+            ~/.cache/ms-playwright
+            ~/Library/Caches/ms-playwright
+            C:\\Users\\runneradmin\\AppData\\Local\\ms-playwright
+          key: ${{ runner.os }}-playwright-${{ hashFiles('wpt-diff/pnpm-lock.yaml') }}
+          restore-keys: |
+            ${{ runner.os }}-playwright-
+
+      - name: Restore Typia validators cache
+        id: typia-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: wpt-diff/generatedValidators/
+          key: ${{ runner.os }}-typia-${{ hashFiles('wpt-diff/src/util/validators/**/*.ts', 'wpt-diff/types/**/*.ts', 'wpt-diff/tsconfig.json') }}
+          restore-keys: |
+            ${{ runner.os }}-typia-
+
+      - name: Setup WPT-diff dependencies
+        run: |
+          cd wpt-diff
+          pnpm install
+          # Install Playwright browsers only if cache miss
+          if [ "${{ steps.playwright-cache.outputs.cache-hit }}" != 'true' ]; then
+            pnpm exec playwright install chromium
+          fi
+          # Generate validators only if cache miss
+          if [ "${{ steps.typia-cache.outputs.cache-hit }}" != 'true' ]; then
+            pnpm generate:validators
+          fi
+
+      - name: Save Playwright browsers cache
+        if: steps.playwright-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            ~/.cache/ms-playwright
+            ~/Library/Caches/ms-playwright
+            C:\\Users\\runneradmin\\AppData\\Local\\ms-playwright
+          key: ${{ runner.os }}-playwright-${{ hashFiles('wpt-diff/pnpm-lock.yaml') }}
+
+      - name: Save Typia validators cache
+        if: steps.typia-cache.outputs.cache-hit != 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: wpt-diff/generatedValidators/
+          key: ${{ runner.os }}-typia-${{ hashFiles('wpt-diff/src/util/validators/**/*.ts', 'wpt-diff/types/**/*.ts', 'wpt-diff/tsconfig.json') }}
+
+      - name: Start Scramjet demo server
+        run: |
+          pnpm start &
+          DEMO_PID="$!"
+          echo "DEMO_PID=$DEMO_PID" >> "$GITHUB_ENV"
+
+      - name: Generate WPT-diff config
+        working-directory: wpt-diff
+        run: |
+          cat > config.toml << EOF
+          [debug]
+          debug = true
+          verbose = true
+
+          [wpt]
+          max_tests = "all"
+          under_proxy = true
+
+          [wpt.urls]
+          proxy_base_url = "http://localhost:1337/"
+          tests_base_url = "http://web-platform.test:8000"
+          api_base_url = "https://wpt.fyi"
+          EOF
+
+      - name: Start WPT server
+        working-directory: wpt-diff/wpt
+        run: |
+          ./wpt serve --no-h2 &
+          echo "WPT_PID=$!" >> "$GITHUB_ENV"
+
+      - name: Install xvfb
+        run: sudo apt install -y xvfb
+
+      - name: Run WPT tests
+        working-directory: wpt-diff
+        env:
+          CI: true
+          SHARD_COUNT: ${{ github.event.inputs.shard_count || '2' }}
+          MAX_TESTS_ARG: ${{ github.event.inputs.max_tests != '' && format('--max-tests {0}', github.event.inputs.max_tests) || '' }}
+        run: |
+          xvfb-run --auto-servernum pnpm start --report "wpt-report.json" --output-failed "failed-tests.json" --shard "${{ matrix.shard }}" --total-shards "$SHARD_COUNT" $MAX_TESTS_ARG
+
+      - name: Stop Scramjet demo server
+        if: always()
+        run: |
+          if [ -n "$DEMO_PID" ]; then
+            kill "$DEMO_PID" || true
+          fi
+
+      - name: Stop WPT server
+        if: always()
+        run: |
+          if [ -n "$WPT_PID" ]; then
+            kill "$WPT_PID" || true
+          fi
+
+      - name: Upload test results
+        uses: actions/upload-artifact@v4
+        with:
+          name: wpt-test-results-shard-${{ matrix.shard }}
+          path: |
+            wpt-diff/wpt-report-diff.json
+            wpt-diff/wpt-report-proxy.json
+            wpt-diff/failed-tests.json
+
+  combine-and-upload-reports:
+    name: Combine and upload reports
+    needs: [build-scramjet, generate-matrix, run-wpt-tests]
+    if: ${{ !cancelled() && needs.run-wpt-tests.result != 'failure' && github.event.inputs.skip_combiner != 'true' }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout WPT-diff
+        uses: actions/checkout@v4
+        with:
+          repository: MercuryWorkshop/WPT-diff
+          path: wpt-diff
+
+      - name: Combine reports and run regression check
+        uses: ./wpt-diff/
+        with:
+          location: wpt-diff
+          enable_regression_check: false
+          github_repository: MercuryWorkshop/WPT-diff
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          regression_check_workflow_name: "WPT Test Results"
+          artifact_name: wpt-test-reports

.gitignore

@@ -0,0 +1,19 @@
+node_modules
+dist
+static/scramjet*
+static/bare-mux.js
+static/bare-client.js
+static/curl-client.js
+static/epoxy-client.js
+static/bare-mux-worker.js
+meta.json
+rewriter/target
+rewriter/wasm/out
+static/wasm.js
+rewriter/*.js
+pnpm-lock.yaml
+playwright-report
+test-results
+*.tgz
+package-lock.json
+rebuild.sh

.prettierignore

@@ -0,0 +1,6 @@
+pnpm-lock.yaml
+README.md
+tsconfig.json
+tests/
+dist/
+rewriter/

.zed/settings.json

@@ -0,0 +1,9 @@
+{
+	"lsp": {
+		"biome": {
+			"enabled": false
+		}
+	},
+	"format_on_save": "on",
+	"formatter": "prettier"
+}

CONTRIBUTOR_LICENSING.md

@@ -0,0 +1,33 @@
+# What is this / Why do we need it
+
+Agreeing to these terms allows us (Mercury Workshop) to use the code you contribute to the project without restrictions.
+
+This is necessary for us to use the software commercially and avoid frivolous legal complaints
+
+This does **not** transfer ownership of your code to Mercury Workshop.
+
+# Contributor License Agreement
+
+In order to clarify the intellectual property license granted with Contributions from any person or entity, Mercury Workshop Inc must have a Contributor License Agreement ("CLA") on file that has been signed by each Contributor, indicating agreement to the license terms below. This license is for your protection as a Contributor as well as the protection of Mercury Workshop; it does not change your rights to use your own Contributions for any other purpose.
+
+You accept and agree to the following terms and conditions for Your present and future Contributions submitted to Mercury Workshop. Except for the license granted herein to Mercury Workshop and recipients of software distributed by Mercury Workshop, You reserve all right, title, and interest in and to Your Contributions.
+
+# Definitions
+
+"You" (or "Your") shall mean the copyright owner or legal entity authorized by the copyright owner that is making this Agreement with Mercury Workshop Inc. For legal entities, the entity making a Contribution and all other entities that control, are controlled by, or are under common control with that entity are considered to be a single Contributor. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
+
+"Contribution" shall mean any original work of authorship, including any modifications or additions to an existing work, that is intentionally submitted by You to Mercury Workshop Inc for inclusion in, or documentation of, any of the products owned or managed by Mercury Workshop Inc (the "Work"). For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to Mercury Workshop Inc or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, Mercury Workshop Inc for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by You as "Not a Contribution."
+
+Grant of Copyright License. Subject to the terms and conditions of this Agreement, You hereby grant to Mercury Workshop Inc and to recipients of software distributed by Mercury Workshop Inc a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Your Contributions and such derivative works.
+
+Grant of Patent License. Subject to the terms and conditions of this Agreement, You hereby grant to Mercury Workshop Inc and to recipients of software distributed by Mercury Workshop Inc a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by You that are necessarily infringed by Your Contribution(s) alone or by combination of Your Contribution(s) with the Work to which such Contribution(s) was submitted. If any entity institutes patent litigation against You or any other entity (including a cross-claim or counterclaim in a lawsuit) alleging that your Contribution, or the Work to which you have contributed, constitutes direct or contributory patent infringement, then any patent licenses granted to that entity under this Agreement for that Contribution or Work shall terminate as of the date such litigation is filed.
+
+You represent that you are legally entitled to grant the above license. If your employer(s) has rights to intellectual property that you create that includes your Contributions, you represent that you have received permission to make Contributions on behalf of that employer, that your employer has waived such rights for your Contributions to Mercury Workshop Inc, or that your employer has executed a separate Corporate CLA with Mercury Workshop Inc.
+
+You represent that each of Your Contributions is Your original creation (see section 7 for submissions on behalf of others). You represent that Your Contribution submissions include complete details of any third-party license or other restriction (including, but not limited to, related patents and trademarks) of which you are personally aware and which are associated with any part of Your Contributions.
+
+You are not expected to provide support for Your Contributions, except to the extent You desire to provide support. You may provide support for free, for a fee, or not at all. Unless required by applicable law or agreed to in writing, You provide Your Contributions on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON- INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE.
+
+Should You wish to submit work that is not Your original creation, You may submit it to Mercury Workshop Inc separately from any Contribution, identifying the complete details of its source and of any license or other restriction (including, but not limited to, related patents, trademarks, and license agreements) of which you are personally aware, and conspicuously marking the work as "Submitted on behalf of a third-party: [named here]".
+
+You agree to notify Mercury Workshop Inc of any facts or circumstances of which you become aware that would make these representations inaccurate in any respect.

INTERCEPTION_PROXY_BIBLE.md

@@ -0,0 +1 @@
+# The Interception Proxy Bible

LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+  14. Revised Versions of this License.
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+  17. Interpretation of Sections 15 and 16.
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+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -1,10 +1,51 @@
----
-title: Scramjet
-emoji: 👀
-colorFrom: indigo
-colorTo: pink
-sdk: docker
-pinned: false
----
-
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+<div align="center">
+  <img src="assets/scramjet.png" height="200" />
+</div>
+
+---
+
+> [!WARNING]  
+> Scramjet is not currently production ready, DO NOT USE THIS AS THE MAIN OPTION IN YOUR SITE.
+
+<a href="https://www.npmjs.com/package/@mercuryworkshop/scramjet"><img src="https://img.shields.io/npm/v/@mercuryworkshop/scramjet.svg?maxAge=3600" alt="npm version" /></a>
+
+Scramjet is an experimental interception based web proxy that aims to be the successor to Ultraviolet. It is designed with security, developer friendliness, and performance in mind. Scramjet strives to have a clean, organized codebase to improve maintainability. Scramjet is made to evade internet censorship and bypass arbitrary web browser restrictions.
+
+## Supported Sites
+
+Some of the popular websites that Scramjet supports include:
+
+-   [Google](https://google.com)
+-   [Youtube](https://www.youtube.com)
+-   [Spotify](https://spotify.com)
+-   [Discord](https://discord.com)
+-   [Reddit](https://reddit.com)
+-   [GeForce NOW](https://play.geforcenow.com/)
+-   [now.gg](https://now.gg)
+
+## Development
+
+### Dependencies
+
+-   Recent versions of `node.js` and `pnpm`
+-   `rustup`
+-   `wasm-bindgen`
+-   [Binaryen's `wasm-opt`](https://github.com/WebAssembly/binaryen)
+-   [this `wasm-snip` fork](https://github.com/r58Playz/wasm-snip)
+
+#### Building
+
+-   Clone the repository with `git clone --recursive https://github.com/MercuryWorkshop/scramjet`
+-   Install the dependencies with `pnpm i`
+-   Build the rewriter with `pnpm rewriter:build`
+-   Build Scramjet with `pnpm build`
+
+### Running Scramjet Locally
+
+You can run the Scramjet dev server with the command
+
+```sh
+pnpm dev
+```
+
+Scramjet should now be running at `localhost:1337` and should rebuild upon a file being changed (excluding the rewriter).

ci/buildstatic.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+DST=staticbuild
+
+rm -rf $DST
+mkdir -p $DST
+
+cp -r node_modules/@mercuryworkshop/bare-mux/dist/ $DST/baremux
+cp -r node_modules/@mercuryworkshop/epoxy-transport/dist/ $DST/epoxy
+cp -r node_modules/@mercuryworkshop/libcurl-transport/dist/ $DST/libcurl
+cp -r assets/ $DST/assets
+cp -r dist/ $DST/scram
+cp -r static/* $DST
+
+echo 'let _CONFIG = { wispurl: "wss://anura.pro/", bareurl: "https://aluu.xyz/bare/" }' > $DST/config.js

codespace-basic-setup.sh

@@ -0,0 +1,14 @@
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+source "$HOME/.cargo/env" # to import rustup in current shell
+pnpm i
+cargo install wasm-bindgen-cli
+VER=$(curl --silent -qI https://github.com/WebAssembly/binaryen/releases/latest | awk -F '/' '/^location/ {print  substr($NF, 1, length($NF)-1)}'); \
+curl -LO https://github.com/WebAssembly/binaryen/releases/download/$VER/binaryen-${VER}-x86_64-linux.tar.gz
+tar xvf binaryen-${VER}-x86_64-linux.tar.gz
+rm -rf binaryen-${VER}-x86_64-linux.tar.gz
+mv binaryen-${VER}/bin/* ~/.local/bin
+mv binaryen-${VER}/lib/* ~/.local/lib
+rm -rf binaryen-${VER}
+cargo install --git https://github.com/r58playz/wasm-snip
+pnpm rewriter:build
+pnpm build

eslint.config.mjs

@@ -0,0 +1,67 @@
+import typescriptEslint from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import js from "@eslint/js";
+import { FlatCompat } from "@eslint/eslintrc";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+	baseDirectory: __dirname,
+	recommendedConfig: js.configs.recommended,
+	allConfig: js.configs.all,
+});
+
+export default [
+	...compat
+		.extends("eslint:recommended", "plugin:@typescript-eslint/recommended")
+		.map((config) => ({
+			...config,
+			files: ["**/*.ts"],
+		})),
+	{
+		ignores: ["dist", "rewriter"],
+	},
+	{
+		files: ["**/*.ts"],
+		plugins: {
+			"@typescript-eslint": typescriptEslint,
+		},
+
+		languageOptions: {
+			parser: tsParser,
+		},
+
+		rules: {
+			"no-await-in-loop": "warn",
+			"no-unused-labels": "warn",
+			quotes: ["error", "double"],
+			"getter-return": "error",
+			"newline-before-return": "error",
+			"no-multiple-empty-lines": "error",
+			"no-var": "error",
+			"no-this-before-super": "warn",
+			"no-useless-return": "error",
+			"no-shadow": "error",
+			"prefer-const": "warn",
+			"no-unreachable": "warn",
+			"no-undef": "off",
+			"no-empty": "off",
+			"no-debugger": "off",
+			"no-shadow": "off",
+			"@typescript-eslint/no-explicit-any": "off",
+			"@typescript-eslint/ban-ts-comment": "off",
+			"@typescript-eslint/ban-types": "off",
+			"@typescript-eslint/no-require-imports": "off",
+			"@typescript-eslint/no-unused-vars": [
+				"warn",
+				{
+					argsIgnorePattern: "^_",
+					varsIgnorePattern: "^_",
+					caughtErrorsIgnorePattern: "^_",
+				},
+			],
+		},
+	},
+];

lib/index.cjs

@@ -0,0 +1,7 @@
+"use strict";
+
+const { resolve } = require("node:path");
+
+const scramjetPath = resolve(__dirname, "..", "dist");
+
+exports.scramjetPath = scramjetPath;

lib/index.d.ts

@@ -0,0 +1,22 @@
+declare const scramjetPath: string;
+
+import * as controller from "../dist/types/controller/index.ts";
+import * as worker from "../dist/types/worker/index.ts";
+import * as types from "../dist/types/types.ts";
+import * as frame from "../dist/types/controller/frame.ts";
+
+declare global {
+	function $scramjetLoadController(): typeof controller;
+	function $scramjetLoadWorker(): typeof worker;
+	function $scramjetLoadClient(config: ScramjetConfig);
+	type ScramjetController = controller.ScramjetController;
+	type ScramjetFrame = frame.ScramjetFrame;
+
+	type ScramjetConfig = types.ScramjetConfig;
+	type ScramjetInitConfig = types.ScramjetInitConfig;
+	var $scramjetVersion: {
+		build: string;
+		version: string;
+	};
+}
+export { scramjetPath };

package.json

@@ -0,0 +1,72 @@
+{
+	"name": "@mercuryworkshop/scramjet",
+	"version": "1.0.2-dev",
+	"description": "An experimental web proxy that aims to be the successor to Ultraviolet",
+	"main": "./lib/index.cjs",
+	"types": "./lib/index.d.js",
+	"type": "module",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/MercuryWorkshop/scramjet"
+	},
+	"scripts": {
+		"build": "rspack build --mode production",
+		"rewriter:build": "cd rewriter/wasm/ && bash build.sh && cd ../../",
+		"dev": "node server.js",
+		"dev:debug": "DEBUG=1 node server.js",
+		"prepack": "RELEASE=1 npm run rewriter:build && tsc && npm run build",
+		"pub": "npm publish --no-git-checks --access public",
+		"format": "prettier --write .",
+		"lint": "eslint ./src/",
+		"lint:fix": "eslint ./src/ --fix",
+		"test": "npx playwright test",
+		"preinstall": "npx only-allow pnpm"
+	},
+	"files": [
+		"dist/*.js",
+		"dist/*.js.map",
+		"dist/*.wasm",
+		"lib"
+	],
+	"keywords": [],
+	"author": "",
+	"license": "MIT",
+	"devDependencies": {
+		"@eslint/eslintrc": "^3.3.1",
+		"@eslint/js": "^9.30.0",
+		"@estruyf/github-actions-reporter": "^1.10.0",
+		"@fastify/static": "^8.2.0",
+		"@mercuryworkshop/bare-as-module3": "^2.2.5",
+		"@mercuryworkshop/epoxy-transport": "^2.1.27",
+		"@mercuryworkshop/libcurl-transport": "^1.5.0",
+		"@mercuryworkshop/wisp-js": "^0.3.3",
+		"@nebula-services/bare-server-node": "^2.0.4",
+		"@playwright/test": "^1.53.1",
+		"@rsdoctor/rspack-plugin": "^1.1.5",
+		"@rspack/cli": "^1.4.8",
+		"@rspack/core": "^1.4.8",
+		"@types/eslint": "^9.6.1",
+		"@types/estree": "^1.0.8",
+		"@types/node": "^24.0.6",
+		"@types/serviceworker": "^0.0.139",
+		"@typescript-eslint/eslint-plugin": "^8.35.0",
+		"@typescript-eslint/parser": "^8.35.0",
+		"dotenv": "^17.0.0",
+		"eslint": "^9.30.0",
+		"fastify": "^5.4.0",
+		"playwright": "^1.53.1",
+		"prettier": "^3.6.2",
+		"ts-checker-rspack-plugin": "^1.1.4",
+		"tslib": "^2.8.1",
+		"typescript": "^5.8.3"
+	},
+	"dependencies": {
+		"@mercuryworkshop/bare-mux": "^2.1.7",
+		"dom-serializer": "^2.0.0",
+		"domhandler": "^5.0.3",
+		"domutils": "^3.2.2",
+		"htmlparser2": "10.0.0",
+		"parse-domain": "^8.2.2",
+		"set-cookie-parser": "^2.7.1"
+	}
+}

playwright.config.ts

@@ -0,0 +1,52 @@
+import { defineConfig, devices } from "@playwright/test";
+import type { GitHubActionOptions } from "@estruyf/github-actions-reporter";
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+export default defineConfig({
+	testDir: "./tests",
+	fullyParallel: true,
+	forbidOnly: !!process.env.CI,
+	retries: 2,
+	reporter: process.env.CI
+		? [
+				[
+					"@estruyf/github-actions-reporter",
+					{
+						title: "Test summary",
+						useDetails: true,
+						showError: true,
+					} as GitHubActionOptions,
+				],
+				["github"],
+			]
+		: "html",
+	timeout: 20000,
+	/* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+	use: {
+		/* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
+		trace: "on-first-retry",
+		actionTimeout: 10000,
+		baseURL: "http://localhost:1337",
+	},
+
+	/* Configure projects for major browsers */
+	projects: [
+		{
+			name: "chromium",
+			use: { ...devices["Desktop Chrome"] },
+		},
+		// {
+		//   name: "firefox",
+		//   use: { ...devices["Desktop Firefox"] },
+		// },
+	],
+
+	/* Run your local dev server before starting the tests */
+	webServer: {
+		command: "pnpm run dev",
+		url: "http://127.0.0.1:1337",
+		reuseExistingServer: false,
+	},
+});

pnpm-workspace.yaml

@@ -0,0 +1,5 @@
+ignoredBuiltDependencies:
+  - bufferutil
+
+packages:
+  - "./"

prettier.config.js

@@ -0,0 +1,11 @@
+/**
+ * @type {import("prettier").Config}
+ */
+const config = {
+	trailingComma: "es5",
+	useTabs: true,
+	semi: true,
+	singleQuote: false,
+};
+
+export default config;

rewriter/Cargo.lock

@@ -0,0 +1,1985 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
+[[package]]
+name = "anstream"
+version = "0.6.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "301af1932e46185686725e0fad2f8f2aa7da69dd70bf6ecc44d6b703844a3933"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "862ed96ca487e809f1c8e5a8447f6ee2cf102f846893800b20cebdf541fc6bbd"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e7644824f0aa2c7b9384579234ef10eb7efb6a0deb83f9630a49594dd9c15c2"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c8bdeb6047d8983be085bab0ba1472e6dc604e7041dbf6fcd5e71523014fae9"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "403f75924867bb1033c59fbf0797484329750cfbe3c4325cd33127941fabc882"
+dependencies = [
+ "anstyle",
+ "once_cell_polyfill",
+ "windows-sys",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.98"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e16d2d3311acee920a9eb8d33b8cbc1787ce4a264e85f964c2404b969bdcd487"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7c02d123df017efcdfbd739ef81735b36c5ba83ec3c59c80a9d7ecc718f92e50"
+
+[[package]]
+name = "autocfg"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
+
+[[package]]
+name = "bitflags"
+version = "2.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
+
+[[package]]
+name = "boa_ast"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c340fe0f0b267787095cbe35240c6786ff19da63ec7b69367ba338eace8169b"
+dependencies = [
+ "bitflags",
+ "boa_interner",
+ "boa_macros",
+ "boa_string",
+ "indexmap",
+ "num-bigint",
+ "rustc-hash",
+]
+
+[[package]]
+name = "boa_engine"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f620c3f06f51e65c0504ddf04978be1b814ac6586f0b45f6019801ab5efd37f9"
+dependencies = [
+ "arrayvec",
+ "bitflags",
+ "boa_ast",
+ "boa_gc",
+ "boa_interner",
+ "boa_macros",
+ "boa_parser",
+ "boa_profiler",
+ "boa_string",
+ "bytemuck",
+ "cfg-if",
+ "dashmap",
+ "fast-float2",
+ "hashbrown 0.15.4",
+ "icu_normalizer 1.5.0",
+ "indexmap",
+ "intrusive-collections",
+ "itertools",
+ "num-bigint",
+ "num-integer",
+ "num-traits",
+ "num_enum",
+ "once_cell",
+ "pollster",
+ "portable-atomic",
+ "rand",
+ "regress",
+ "rustc-hash",
+ "ryu-js",
+ "serde",
+ "serde_json",
+ "sptr",
+ "static_assertions",
+ "tap",
+ "thin-vec",
+ "thiserror",
+ "time",
+]
+
+[[package]]
+name = "boa_gc"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2425c0b7720d42d73eaa6a883fbb77a5c920da8694964a3d79a67597ac55cce2"
+dependencies = [
+ "boa_macros",
+ "boa_profiler",
+ "boa_string",
+ "hashbrown 0.15.4",
+ "thin-vec",
+]
+
+[[package]]
+name = "boa_interner"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42407a3b724cfaecde8f7d4af566df4b56af32a2f11f0956f5570bb974e7f749"
+dependencies = [
+ "boa_gc",
+ "boa_macros",
+ "hashbrown 0.15.4",
+ "indexmap",
+ "once_cell",
+ "phf 0.11.3",
+ "rustc-hash",
+ "static_assertions",
+]
+
+[[package]]
+name = "boa_macros"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fd3f870829131332587f607a7ff909f1af5fc523fd1b192db55fbbdf52e8d3c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
+
+[[package]]
+name = "boa_parser"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9cc142dac798cdc6e2dbccfddeb50f36d2523bb977a976e19bdb3ae19b740804"
+dependencies = [
+ "bitflags",
+ "boa_ast",
+ "boa_interner",
+ "boa_macros",
+ "boa_profiler",
+ "fast-float2",
+ "icu_properties 1.5.1",
+ "num-bigint",
+ "num-traits",
+ "regress",
+ "rustc-hash",
+]
+
+[[package]]
+name = "boa_profiler"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4064908e7cdf9b6317179e9b04dcb27f1510c1c144aeab4d0394014f37a0f922"
+
+[[package]]
+name = "boa_string"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7debc13fbf7997bf38bf8e9b20f1ad5e2a7d27a900e1f6039fe244ce30f589b5"
+dependencies = [
+ "fast-float2",
+ "paste",
+ "rustc-hash",
+ "sptr",
+ "static_assertions",
+]
+
+[[package]]
+name = "bumpalo"
+version = "3.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
+dependencies = [
+ "allocator-api2",
+]
+
+[[package]]
+name = "bytemuck"
+version = "1.23.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c76a5792e44e4abe34d3abf15636779261d45a7450612059293d1d2cfc63422"
+dependencies = [
+ "bytemuck_derive",
+]
+
+[[package]]
+name = "bytemuck_derive"
+version = "1.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ecc273b49b3205b83d648f0690daa588925572cc5063745bfe547fe7ec8e1a1"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
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rewriter/Cargo.toml

@@ -0,0 +1,20 @@
+[workspace]
+members = ["transform", "js", "html", "native", "wasm"]
+resolver = "2"
+
+[profile.release]
+opt-level = 3
+debug = true
+lto = true
+codegen-units = 1
+panic = "abort"
+
+[workspace.dependencies]
+oxc = { version = "0.77.2", features = ["ast_visit"] }
+
+[workspace.lints.clippy]
+pedantic = { level = "warn", priority = -1 }
+struct-excessive-bools = "allow"
+missing-errors-doc = "allow"
+cast-possible-truncation = "allow"
+must-use-candidate = "allow"

rewriter/html/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "html"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+oxc = { workspace = true }
+thiserror = "2.0.12"
+tl = { git = "https://github.com/r58playz/tl" }
+transform = { version = "0.1.0", path = "../transform" }
+
+[lints]
+workspace = true
+
+[features]
+debug = ["transform/debug"]

rewriter/html/src/changes.rs

@@ -0,0 +1,154 @@
+use oxc::{allocator::Allocator, span::Span};
+use transform::{
+	TransformResult, Transformer,
+	transform::{Transform, TransformLL},
+	transforms,
+};
+
+use crate::RewriterError;
+
+#[derive(PartialEq, Eq)]
+enum HtmlRewriteType<'alloc: 'data, 'data> {
+	AddScramAttr { key: &'data str, val: &'data str },
+	ReplaceAttr { new: &'alloc str },
+	ReplaceText { new: &'alloc str },
+	InsertText { text: &'alloc str },
+	RemoveText,
+}
+
+#[derive(PartialEq, Eq)]
+pub struct HtmlRewrite<'alloc: 'data, 'data> {
+	span: Span,
+	ty: HtmlRewriteType<'alloc, 'data>,
+}
+
+impl<'alloc: 'data, 'data> HtmlRewrite<'alloc, 'data> {
+	pub fn add_scram_attr(after: Span, key: &'data str, val: &'data str) -> Self {
+		Self {
+			span: Span::new(after.end, after.end),
+			ty: HtmlRewriteType::AddScramAttr { key, val },
+		}
+	}
+
+	pub fn replace_attr(val: Span, new: &'alloc str) -> Self {
+		Self {
+			span: val,
+			ty: HtmlRewriteType::ReplaceAttr { new },
+		}
+	}
+	pub fn remove_attr(data: &'data str, key: Span, value: Span) -> Self {
+		let end = if Self::attr_is_quoted(data, value) {
+			value.end + 1
+		} else {
+			value.end
+		};
+
+		Self {
+			span: Span::new(key.start, end),
+			ty: HtmlRewriteType::RemoveText,
+		}
+	}
+
+	pub fn replace(node: Span, text: &'alloc str) -> Self {
+		Self {
+			span: node,
+			ty: HtmlRewriteType::ReplaceText { new: text },
+		}
+	}
+
+	pub fn insert_text(after: Span, text: &'alloc str) -> Self {
+		Self {
+			span: Span::new(after.end, after.end),
+			ty: HtmlRewriteType::InsertText { text },
+		}
+	}
+
+	pub fn remove_node(node: Span) -> Self {
+		Self {
+			span: node,
+			ty: HtmlRewriteType::RemoveText,
+		}
+	}
+
+	fn attr_is_quoted(data: &str, attr: Span) -> bool {
+		data.get((attr.start - 1) as usize..attr.start as usize)
+			.is_some_and(|x| x == "\'" || x == "\"")
+	}
+}
+
+impl<'alloc: 'data, 'data> Transform<'data> for HtmlRewrite<'alloc, 'data> {
+	type ToLowLevelData = &'data str;
+
+	fn span(&self) -> Span {
+		self.span
+	}
+
+	fn into_low_level(self, data: &Self::ToLowLevelData, _offset: i32) -> TransformLL<'data> {
+		let data = *data;
+		match self.ty {
+			HtmlRewriteType::AddScramAttr { key, val } => {
+				TransformLL::insert(transforms![" scramjet-attr-", key, "=\"", val, "\""])
+			}
+			HtmlRewriteType::ReplaceAttr { new } => {
+				TransformLL::replace(if Self::attr_is_quoted(data, self.span) {
+					transforms![new]
+				} else {
+					transforms!["\"", new, "\""]
+				})
+			}
+			HtmlRewriteType::ReplaceText { new } => TransformLL::replace(transforms![new]),
+			HtmlRewriteType::InsertText { text } => TransformLL::insert(transforms![text]),
+			HtmlRewriteType::RemoveText => TransformLL::replace(transforms![]),
+		}
+	}
+}
+
+impl PartialOrd for HtmlRewrite<'_, '_> {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl Ord for HtmlRewrite<'_, '_> {
+	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+		self.span.start.cmp(&other.span.start)
+	}
+}
+
+pub(crate) struct HtmlChanges<'alloc: 'data, 'data> {
+	inner: Transformer<'alloc, 'data, HtmlRewrite<'alloc, 'data>>,
+}
+
+impl<'alloc: 'data, 'data> HtmlChanges<'alloc, 'data> {
+	#[inline]
+	pub fn new() -> Self {
+		Self {
+			inner: Transformer::new(),
+		}
+	}
+
+	#[inline]
+	pub fn add(&mut self, rewrite: HtmlRewrite<'alloc, 'data>) {
+		self.inner.add(std::iter::once(rewrite));
+	}
+
+	#[inline]
+	pub fn set_alloc(&mut self, alloc: &'alloc Allocator) -> Result<(), RewriterError> {
+		Ok(self.inner.set_alloc(alloc)?)
+	}
+
+	#[inline]
+	pub fn take_alloc(&mut self) -> Result<(), RewriterError> {
+		Ok(self.inner.take_alloc()?)
+	}
+
+	#[inline]
+	pub fn empty(&self) -> bool {
+		self.inner.empty()
+	}
+
+	#[inline]
+	pub fn perform(&mut self, html: &'data str) -> Result<TransformResult<'alloc>, RewriterError> {
+		Ok(self.inner.perform(html, &html, false)?)
+	}
+}

rewriter/html/src/lib.rs

@@ -0,0 +1,142 @@
+use std::{cell::RefCell, error::Error, num::TryFromIntError};
+
+use changes::HtmlChanges;
+use oxc::allocator::Allocator;
+use rule::RewriteRule;
+use thiserror::Error;
+use tl::ParserOptions;
+use visitor::Visitor;
+
+mod changes;
+pub mod rule;
+mod visitor;
+
+pub use visitor::{VisitorExternalTool, VisitorExternalToolCallback};
+
+#[derive(Debug, Error)]
+pub enum RewriterError {
+	#[error("tl: {0}")]
+	Tl(#[from] tl::ParseError),
+	#[error("transformer: {0}")]
+	Transformer(#[from] transform::TransformError),
+
+	#[error("rewrite function: {0}")]
+	Rewrite(Box<dyn Error + Sync + Send>),
+	#[error("external tool function: {0}")]
+	ExternalTool(Box<dyn Error + Sync + Send>),
+	#[error("external tool didn't return anything")]
+	ExternalToolEmpty,
+
+	#[error("Not utf8")]
+	NotUtf8,
+	#[error("usize too big")]
+	ConversionFailed(#[from] TryFromIntError),
+	#[error("Already rewriting")]
+	AlreadyRewriting,
+	#[error("Not rewriting")]
+	NotRewriting,
+	#[error("Changes left over")]
+	Leftover,
+}
+
+pub struct Rewriter<T> {
+	rules: Vec<RewriteRule<T>>,
+	external_tool: VisitorExternalToolCallback<T>,
+
+	changes: RefCell<Option<HtmlChanges<'static, 'static>>>,
+}
+
+impl<T> Rewriter<T> {
+	pub fn new(
+		rules: Vec<RewriteRule<T>>,
+		external_tool: VisitorExternalToolCallback<T>,
+	) -> Result<Self, RewriterError> {
+		Ok(Self {
+			rules,
+			external_tool,
+			changes: RefCell::new(Some(HtmlChanges::new())),
+		})
+	}
+
+	fn take_changes<'alloc: 'data, 'data>(
+		&'data self,
+		alloc: &'alloc Allocator,
+	) -> Result<HtmlChanges<'alloc, 'data>, RewriterError> {
+		let mut slot = self
+			.changes
+			.try_borrow_mut()
+			.map_err(|_| RewriterError::AlreadyRewriting)?;
+
+		slot.take()
+			.ok_or(RewriterError::AlreadyRewriting)
+			.and_then(|x| {
+				let mut x = unsafe {
+					std::mem::transmute::<HtmlChanges<'static, 'static>, HtmlChanges<'alloc, 'data>>(
+						x,
+					)
+				};
+				x.set_alloc(alloc)?;
+				Ok(x)
+			})
+	}
+
+	fn put_changes<'alloc: 'data, 'data>(
+		&'data self,
+		mut changes: HtmlChanges<'alloc, 'data>,
+	) -> Result<(), RewriterError> {
+		if !changes.empty() {
+			return Err(RewriterError::Leftover);
+		}
+
+		let mut slot = self
+			.changes
+			.try_borrow_mut()
+			.map_err(|_| RewriterError::AlreadyRewriting)?;
+
+		if slot.is_some() {
+			Err(RewriterError::NotRewriting)
+		} else {
+			changes.take_alloc()?;
+
+			let changes = unsafe {
+				std::mem::transmute::<HtmlChanges<'alloc, 'data>, HtmlChanges<'static, 'static>>(
+					changes,
+				)
+			};
+
+			slot.replace(changes);
+
+			Ok(())
+		}
+	}
+
+	pub fn rewrite<'alloc: 'data, 'data>(
+		&'data self,
+		alloc: &'alloc Allocator,
+		html: &'data str,
+		data: &T,
+		from_top: bool,
+	) -> Result<oxc::allocator::Vec<'alloc, u8>, RewriterError> {
+		let tree = tl::parse(html, ParserOptions::default())?;
+
+		let mut changes = self.take_changes(alloc)?;
+
+		let visitor = Visitor {
+			alloc,
+			rules: &self.rules,
+			external_tool_func: &self.external_tool,
+			rule_data: data,
+
+			data: html,
+			tree,
+			from_top,
+		};
+		visitor.rewrite(&mut changes)?;
+
+		let res = changes.perform(html)?;
+
+		self.put_changes(changes)?;
+
+		Ok(res.source)
+	}
+}

rewriter/html/src/rule.rs

@@ -0,0 +1,40 @@
+use std::{
+	collections::{HashMap, HashSet},
+	error::Error,
+};
+
+use oxc::allocator::Allocator;
+
+pub type RewriteRuleCallback<T> = Box<
+	dyn for<'alloc, 'data> Fn(
+		&'alloc Allocator,
+		&'data str,
+		&'data T,
+	) -> Result<Option<&'alloc str>, Box<dyn Error + Sync + Send>>,
+>;
+
+pub struct RewriteRule<T> {
+	pub attrs: HashMap<String, Option<HashSet<String>>>,
+	pub func: RewriteRuleCallback<T>,
+}
+
+#[macro_export]
+macro_rules! attrmap {
+	({
+		$($attr:literal: [$($el:literal),*]),*
+	}) => {
+		{
+			let mut map = std::collections::HashMap::<String, Option<std::collections::HashSet<String>>>::new();
+			$(
+				{
+					let mut vec = std::collections::HashSet::new();
+					$(
+						vec.insert($el.to_string());
+					)*
+					map.insert($attr.to_string(), Some(vec));
+				}
+			)*
+			map
+		}
+    };
+}

rewriter/html/src/visitor.rs

@@ -0,0 +1,365 @@
+use std::error::Error;
+
+use oxc::{
+	allocator::{Allocator, StringBuilder},
+	span::Span,
+};
+use tl::{Bytes, HTMLTag, Node, NodeHandle, VDom};
+
+use crate::{
+	HtmlChanges, RewriterError,
+	changes::HtmlRewrite,
+	rule::{RewriteRule, RewriteRuleCallback},
+};
+
+const EVENT_ATTRIBUTES: [&str; 100] = [
+	"onbeforexrselect",
+	"onabort",
+	"onbeforeinput",
+	"onbeforematch",
+	"onbeforetoggle",
+	"onblur",
+	"oncancel",
+	"oncanplay",
+	"oncanplaythrough",
+	"onchange",
+	"onclick",
+	"onclose",
+	"oncontentvisibilityautostatechange",
+	"oncontextlost",
+	"oncontextmenu",
+	"oncontextrestored",
+	"oncuechange",
+	"ondblclick",
+	"ondrag",
+	"ondragend",
+	"ondragenter",
+	"ondragleave",
+	"ondragover",
+	"ondragstart",
+	"ondrop",
+	"ondurationchange",
+	"onemptied",
+	"onended",
+	"onerror",
+	"onfocus",
+	"onformdata",
+	"oninput",
+	"oninvalid",
+	"onkeydown",
+	"onkeypress",
+	"onkeyup",
+	"onload",
+	"onloadeddata",
+	"onloadedmetadata",
+	"onloadstart",
+	"onmousedown",
+	"onmouseenter",
+	"onmouseleave",
+	"onmousemove",
+	"onmouseout",
+	"onmouseover",
+	"onmouseup",
+	"onmousewheel",
+	"onpause",
+	"onplay",
+	"onplaying",
+	"onprogress",
+	"onratechange",
+	"onreset",
+	"onresize",
+	"onscroll",
+	"onsecuritypolicyviolation",
+	"onseeked",
+	"onseeking",
+	"onselect",
+	"onslotchange",
+	"onstalled",
+	"onsubmit",
+	"onsuspend",
+	"ontimeupdate",
+	"ontoggle",
+	"onvolumechange",
+	"onwaiting",
+	"onwebkitanimationend",
+	"onwebkitanimationiteration",
+	"onwebkitanimationstart",
+	"onwebkittransitionend",
+	"onwheel",
+	"onauxclick",
+	"ongotpointercapture",
+	"onlostpointercapture",
+	"onpointerdown",
+	"onpointermove",
+	"onpointerrawupdate",
+	"onpointerup",
+	"onpointercancel",
+	"onpointerover",
+	"onpointerout",
+	"onpointerenter",
+	"onpointerleave",
+	"onselectstart",
+	"onselectionchange",
+	"onanimationend",
+	"onanimationiteration",
+	"onanimationstart",
+	"ontransitionrun",
+	"ontransitionstart",
+	"ontransitionend",
+	"ontransitioncancel",
+	"oncopy",
+	"oncut",
+	"onpaste",
+	"onscrollend",
+	"onscrollsnapchange",
+	"onscrollsnapchanging",
+];
+
+pub type VisitorExternalToolCallback<T> = Box<
+	dyn for<'alloc, 'data> Fn(
+		&'alloc Allocator,
+		VisitorExternalTool<'data>,
+		&'data T,
+	) -> Result<Option<&'alloc str>, Box<dyn Error + Sync + Send>>,
+>;
+
+pub struct Visitor<'alloc: 'data, 'data, T> {
+	pub alloc: &'alloc Allocator,
+	pub rules: &'data [RewriteRule<T>],
+	pub external_tool_func: &'data VisitorExternalToolCallback<T>,
+	pub rule_data: &'data T,
+
+	pub data: &'data str,
+	pub tree: VDom<'data>,
+	pub from_top: bool,
+}
+
+pub enum VisitorExternalTool<'data> {
+	SetMetaBase(&'data str),
+	Base64(&'data str),
+	RewriteInlineScript { code: &'data str, module: bool },
+	RewriteJsAttr { attr: &'data str, code: &'data str },
+	RewriteHttpEquivContent(&'data str),
+	RewriteCss(&'data str),
+	GetScriptText { found_head: bool },
+	Log(&'data str),
+}
+
+impl<'alloc, 'data, T> Visitor<'alloc, 'data, T> {
+	fn boundaries(&self, tag: &HTMLTag<'data>) -> Result<Span, RewriterError> {
+		let (start, end) = tag.boundaries(self.tree.parser());
+		let end = end + 1;
+		Ok(Span::new(start.try_into()?, end.try_into()?))
+	}
+
+	fn calculate_bounds(&self, raw: &Bytes<'data>) -> Result<Span, RewriterError> {
+		let input = self.data.as_ptr();
+		let start = raw.as_ptr();
+		let offset = start as usize - input as usize;
+		let end = offset + raw.as_bytes().len();
+
+		Ok(Span::new(offset.try_into()?, end.try_into()?))
+	}
+
+	fn get(&'data self, handle: NodeHandle) -> &'data Node<'data> {
+		unsafe { handle.get(self.tree.parser()).unwrap_unchecked() }
+	}
+
+	fn check_rules(&self, name: &str, attr: &str) -> Option<&RewriteRuleCallback<T>> {
+		self.rules
+			.iter()
+			.find(|x| {
+				x.attrs.get(attr).is_some_and(|x| {
+					x.as_ref()
+						.is_none_or(|x| x.contains(name) || x.contains("*"))
+				})
+			})
+			.map(|x| &x.func)
+	}
+
+	fn match_script_type(ty: Option<&str>) -> bool {
+		ty.is_none_or(|x| {
+			matches!(
+				x,
+				"application/javascript" | "text/javascript" | "module" | "importmap",
+			)
+		})
+	}
+
+	fn external_tool(
+		&self,
+		tool: VisitorExternalTool<'data>,
+	) -> Result<Option<&'alloc str>, RewriterError> {
+		(self.external_tool_func)(self.alloc, tool, self.rule_data)
+			.map_err(RewriterError::ExternalTool)
+	}
+
+	fn external_tool_val(
+		&self,
+		tool: VisitorExternalTool<'data>,
+	) -> Result<&'alloc str, RewriterError> {
+		self.external_tool(tool)?
+			.ok_or(RewriterError::ExternalToolEmpty)
+	}
+
+	#[expect(clippy::too_many_lines)]
+	pub fn rewrite(
+		&'data self,
+		changes: &mut HtmlChanges<'alloc, 'data>,
+	) -> Result<(), RewriterError> {
+		let mut head = None;
+
+		for node in self.tree.nodes() {
+			if let Node::Tag(tag) = node {
+				let name = tag.name().try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+
+				if name == "head" && head.is_none() {
+					head.replace(tag);
+				}
+
+				if name == "base"
+					&& let Some(Some(val)) = tag.attributes().get(&"href".into())
+				{
+					self.external_tool(VisitorExternalTool::SetMetaBase(
+						val.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?,
+					))?;
+				}
+
+				for (k, v) in tag.attributes().iter() {
+					let attr = k.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+
+					if let Some(cb) = self.check_rules(name, attr)
+						&& let Some(v) = v
+					{
+						let value = v.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+						let change = (cb)(self.alloc, value, self.rule_data)
+							.map_err(RewriterError::Rewrite)?;
+
+						let bounds = self.calculate_bounds(v)?;
+
+						if let Some(change) = change {
+							let change = if name == "script"
+								&& attr == "src" && let Some(Some(ty)) =
+								tag.attributes().get(&"type".into())
+								&& ty.try_as_utf8_str().ok_or(RewriterError::NotUtf8)? == "module"
+							{
+								self.alloc.alloc_concat_strs_array([change, "?type=module"])
+							} else {
+								change
+							};
+
+							changes.add(HtmlRewrite::replace_attr(bounds, change));
+						} else {
+							let key = self.calculate_bounds(k)?;
+							changes.add(HtmlRewrite::remove_attr(self.data, key, bounds));
+						}
+					}
+
+					if EVENT_ATTRIBUTES.contains(&attr)
+						&& let Some(v) = v
+					{
+						let value = v.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+						let bounds = self.calculate_bounds(v)?;
+						let rewritten =
+							self.external_tool_val(VisitorExternalTool::RewriteJsAttr {
+								attr,
+								code: value,
+							})?;
+
+						changes.add(HtmlRewrite::replace_attr(bounds, rewritten));
+						changes.add(HtmlRewrite::add_scram_attr(bounds, attr, value));
+					}
+				}
+
+				if name == "style"
+					&& let Some(child) = tag.children().top().get(0)
+					&& let Node::Raw(child) = self.get(*child)
+				{
+					let rewritten = self.external_tool_val(VisitorExternalTool::RewriteCss(
+						child.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?,
+					))?;
+
+					changes.add(HtmlRewrite::replace(
+						self.calculate_bounds(child)?,
+						rewritten,
+					));
+				}
+
+				if name == "script"
+					&& let ty = tag
+						.attributes()
+						.get(&"type".into())
+						.and_then(|x| x.as_ref())
+						.map(|x| x.try_as_utf8_str().ok_or(RewriterError::NotUtf8))
+						.transpose()? && Self::match_script_type(ty)
+					&& tag.attributes().get(&"src".into()).is_none()
+				{
+					let child = tag.inner_html();
+					let code = child.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+					let module = ty.is_some_and(|x| x == "module");
+
+					let b64 = self.external_tool_val(VisitorExternalTool::Base64(code))?;
+					let rewritten =
+						self.external_tool_val(VisitorExternalTool::RewriteInlineScript {
+							code,
+							module,
+						})?;
+
+					changes.add(HtmlRewrite::add_scram_attr(
+						self.calculate_bounds(tag.name())?,
+						"script-source-src",
+						b64,
+					));
+					changes.add(HtmlRewrite::replace(
+						self.calculate_bounds(child)?,
+						rewritten,
+					));
+				}
+
+				if name == "meta"
+					&& let Some(Some(eqiv)) = tag.attributes().get(&"http-equiv".into())
+				{
+					let mut val = StringBuilder::from_str_in(
+						eqiv.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?,
+						self.alloc,
+					);
+					val.as_mut_str().make_ascii_lowercase();
+
+					if val == "content-security-policy" {
+						changes.add(HtmlRewrite::remove_node(self.boundaries(tag)?));
+					} else if val == "refresh"
+						&& let Some(Some(content)) = tag.attributes().get(&"content".into())
+					{
+						let val = content.try_as_utf8_str().ok_or(RewriterError::NotUtf8)?;
+						let rewritten = self
+							.external_tool_val(VisitorExternalTool::RewriteHttpEquivContent(val))?;
+						changes.add(HtmlRewrite::replace_attr(
+							self.calculate_bounds(content)?,
+							rewritten,
+						));
+					}
+				}
+			}
+		}
+
+		if self.from_top {
+			let (head_span, head_text) = if let Some(head) = head {
+				let outer = self.boundaries(head)?;
+				let inner = self.calculate_bounds(head.inner_html())?;
+
+				let start = Span::new(outer.start, inner.start);
+				let text = self
+					.external_tool_val(VisitorExternalTool::GetScriptText { found_head: true })?;
+				(start, text)
+			} else {
+				let text = self
+					.external_tool_val(VisitorExternalTool::GetScriptText { found_head: false })?;
+				(Span::new(0, 0), text)
+			};
+
+			changes.add(HtmlRewrite::insert_text(head_span, head_text));
+		}
+
+		Ok(())
+	}
+}

rewriter/js/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "js"
+version = "0.1.0"
+edition = "2024"
+
+[lints]
+workspace = true
+
+[dependencies]
+oxc = { workspace = true }
+smallvec = "1.15.0"
+thiserror = "2.0.12"
+transform = { version = "0.1.0", path = "../transform" }
+
+[features]
+default = ["debug"]
+debug = ["transform/debug"]

rewriter/js/src/cfg.rs

@@ -0,0 +1,38 @@
+use std::error::Error;
+
+use oxc::allocator::StringBuilder;
+
+pub trait UrlRewriter {
+	fn rewrite(
+		&self,
+		cfg: &Config,
+		flags: &Flags,
+		url: &str,
+		builder: &mut StringBuilder,
+		module: bool,
+	) -> Result<(), Box<dyn Error + Sync + Send>>;
+}
+
+pub struct Config {
+	pub prefix: String,
+
+	pub wrapfn: String,
+	pub wrapthisfn: String,
+	pub importfn: String,
+	pub rewritefn: String,
+	pub setrealmfn: String,
+	pub metafn: String,
+	pub pushsourcemapfn: String,
+}
+
+#[derive(Debug)]
+pub struct Flags {
+	pub base: String,
+	pub sourcetag: String,
+
+	pub is_module: bool,
+	pub capture_errors: bool,
+	pub scramitize: bool,
+	pub do_sourcemaps: bool,
+	pub strict_rewrites: bool,
+}

rewriter/js/src/changes.rs

@@ -0,0 +1,215 @@
+use std::cmp::Ordering;
+
+use oxc::{
+	allocator::Allocator,
+	ast::ast::AssignmentOperator,
+	span::{Atom, Span},
+};
+use transform::{
+	TransformResult, Transformer,
+	transform::{Transform, TransformLL},
+	transforms,
+};
+
+use crate::{
+	RewriterError,
+	cfg::{Config, Flags},
+	rewrite::Rewrite,
+};
+
+// const STRICTCHECKER: &str = "(function(a){arguments[0]=false;return a})(true)";
+const STRICTCHECKER: &str = "(function(){return!this;})()";
+
+macro_rules! change {
+    ($span:expr, $($ty:tt)*) => {
+		$crate::changes::JsChange::new($span, $crate::changes::JsChangeType::$($ty)*)
+    };
+}
+pub(crate) use change;
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum JsChangeType<'alloc: 'data, 'data> {
+	/// insert `${cfg.wrapfn}(`
+	WrapFnLeft { wrap: bool },
+	/// insert `,strictchecker)`
+	WrapFnRight { wrap: bool },
+	/// insert `${cfg.setrealmfn}({}).`
+	SetRealmFn,
+	/// insert `${cfg.wrapthis}(`
+	WrapThisFn,
+	/// insert `$scramerr(ident);`
+	ScramErrFn { ident: Atom<'data> },
+	/// insert `$scramitize(`
+	ScramitizeFn,
+	/// insert `eval(${cfg.rewritefn}(`
+	EvalRewriteFn,
+	/// insert `: ${cfg.wrapfn}(ident)`
+	ShorthandObj { ident: Atom<'data> },
+	/// insert scramtag
+	SourceTag,
+
+	/// replace span with `${cfg.importfn}`
+	ImportFn,
+	/// replace span with `${cfg.metafn}("${cfg.base}")`
+	MetaFn,
+	/// replace span with `((t)=>$scramjet$tryset(${name},"${op}",t)||(${name}${op}t))(`
+	AssignmentLeft {
+		name: Atom<'data>,
+		op: AssignmentOperator,
+	},
+
+	/// insert `)`
+	ClosingParen { semi: bool, replace: bool },
+
+	/// replace span with text
+	Replace { text: &'alloc str },
+	/// replace span with ""
+	Delete,
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct JsChange<'alloc: 'data, 'data> {
+	pub span: Span,
+	pub ty: JsChangeType<'alloc, 'data>,
+}
+
+impl<'alloc: 'data, 'data> JsChange<'alloc, 'data> {
+	pub fn new(span: Span, ty: JsChangeType<'alloc, 'data>) -> Self {
+		Self { span, ty }
+	}
+}
+
+impl<'alloc: 'data, 'data> Transform<'data> for JsChange<'alloc, 'data> {
+	type ToLowLevelData = (&'data Config, &'data Flags);
+
+	fn span(&self) -> Span {
+		self.span
+	}
+
+	fn into_low_level(
+		self,
+		(cfg, flags): &Self::ToLowLevelData,
+		offset: i32,
+	) -> TransformLL<'data> {
+		use JsChangeType as Ty;
+		use TransformLL as LL;
+		match self.ty {
+			Ty::WrapFnLeft { wrap } => LL::insert(if wrap {
+				transforms!["(", &cfg.wrapfn, "("]
+			} else {
+				transforms![&cfg.wrapfn, "("]
+			}),
+			Ty::WrapFnRight { wrap } => LL::insert(if wrap {
+				transforms![",", STRICTCHECKER, "))"]
+			} else {
+				transforms![",", STRICTCHECKER, ")"]
+			}),
+			Ty::SetRealmFn => LL::insert(transforms![&cfg.setrealmfn, "({})."]),
+			Ty::WrapThisFn => LL::insert(transforms![&cfg.wrapthisfn, "("]),
+			Ty::ScramErrFn { ident } => LL::insert(transforms!["$scramerr(", ident, ");"]),
+			Ty::ScramitizeFn => LL::insert(transforms![" $scramitize("]),
+			Ty::EvalRewriteFn => LL::replace(transforms!["eval(", &cfg.rewritefn, "("]),
+			Ty::ShorthandObj { ident } => {
+				LL::insert(transforms![":", &cfg.wrapfn, "(", ident, ")"])
+			}
+			Ty::SourceTag => LL::insert(transforms![
+				"/*scramtag ",
+				self.span.start.wrapping_add_signed(offset),
+				" ",
+				&flags.sourcetag,
+				"*/"
+			]),
+			Ty::ImportFn => LL::replace(transforms![&cfg.importfn, "(\"", &flags.base, "\","]),
+			Ty::MetaFn => LL::replace(transforms![&cfg.metafn, "(\"", &flags.base, "\")"]),
+			Ty::AssignmentLeft { name, op } => LL::replace(transforms![
+				"((t)=>$scramjet$tryset(",
+				name,
+				",\"",
+				op,
+				"\",t)||(",
+				name,
+				op,
+				"t))("
+			]),
+			Ty::ClosingParen { semi, replace } => {
+				let vec = if semi {
+					transforms![");"]
+				} else {
+					transforms![")"]
+				};
+
+				if replace {
+					LL::replace(vec)
+				} else {
+					LL::insert(vec)
+				}
+			}
+			Ty::Replace { text } => LL::replace(transforms![text]),
+			Ty::Delete => LL::replace(transforms![]),
+		}
+	}
+}
+
+impl PartialOrd for JsChange<'_, '_> {
+	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl Ord for JsChange<'_, '_> {
+	fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+		use JsChangeType as Ty;
+
+		match self.span.start.cmp(&other.span.start) {
+			Ordering::Equal => match (&self.ty, &other.ty) {
+				(Ty::ScramErrFn { .. }, _) => Ordering::Less,
+				(_, Ty::ScramErrFn { .. }) => Ordering::Greater,
+				_ => Ordering::Equal,
+			},
+			x => x,
+		}
+	}
+}
+
+pub(crate) struct JsChanges<'alloc: 'data, 'data> {
+	inner: Transformer<'alloc, 'data, JsChange<'alloc, 'data>>,
+}
+
+impl<'alloc: 'data, 'data> JsChanges<'alloc, 'data> {
+	#[inline]
+	pub fn new() -> Self {
+		Self {
+			inner: Transformer::new(),
+		}
+	}
+
+	#[inline]
+	pub fn add(&mut self, rewrite: Rewrite<'alloc, 'data>) {
+		self.inner.add(rewrite.into_inner());
+	}
+
+	#[inline]
+	pub fn set_alloc(&mut self, alloc: &'alloc Allocator) -> Result<(), RewriterError> {
+		Ok(self.inner.set_alloc(alloc)?)
+	}
+
+	#[inline]
+	pub fn take_alloc(&mut self) -> Result<(), RewriterError> {
+		Ok(self.inner.take_alloc()?)
+	}
+
+	#[inline]
+	pub fn empty(&self) -> bool {
+		self.inner.empty()
+	}
+
+	#[inline]
+	pub fn perform(
+		&mut self,
+		js: &'data str,
+		cfg: &'data Config,
+		flags: &'data Flags,
+	) -> Result<TransformResult<'alloc>, RewriterError> {
+		Ok(self.inner.perform(js, &(cfg, flags), true)?)
+	}
+}

rewriter/js/src/lib.rs

@@ -0,0 +1,174 @@
+use std::cell::RefCell;
+
+use oxc::{
+	allocator::{Allocator, Vec},
+	ast_visit::Visit,
+	diagnostics::OxcDiagnostic,
+	parser::{ParseOptions, Parser},
+	span::SourceType,
+};
+use thiserror::Error;
+
+pub mod cfg;
+mod changes;
+mod rewrite;
+mod visitor;
+
+use cfg::{Config, Flags, UrlRewriter};
+use changes::JsChanges;
+use visitor::Visitor;
+
+#[derive(Error, Debug)]
+pub enum RewriterError {
+	#[error("transformer error: {0}")]
+	Transformer(#[from] transform::TransformError),
+	#[error("url rewriter error: {0}")]
+	Url(Box<dyn std::error::Error + Sync + Send>),
+	#[error("formatting error: {0}")]
+	Formatting(#[from] std::fmt::Error),
+
+	#[error("oxc panicked in parser: {0}")]
+	OxcPanicked(String),
+	#[error("Already rewriting")]
+	AlreadyRewriting,
+	#[error("Not rewriting")]
+	NotRewriting,
+	#[error("Changes left over")]
+	Leftover,
+}
+
+#[derive(Debug)]
+pub struct RewriteResult<'alloc> {
+	pub js: Vec<'alloc, u8>,
+	pub sourcemap: Vec<'alloc, u8>,
+
+	pub errors: std::vec::Vec<OxcDiagnostic>,
+	pub flags: Flags,
+}
+
+pub struct Rewriter<E: UrlRewriter> {
+	cfg: Config,
+	url: E,
+
+	changes: RefCell<Option<JsChanges<'static, 'static>>>,
+}
+
+impl<E: UrlRewriter> Rewriter<E> {
+	fn take_changes<'alloc: 'data, 'data>(
+		&'data self,
+		alloc: &'alloc Allocator,
+	) -> Result<JsChanges<'alloc, 'data>, RewriterError> {
+		let mut slot = self
+			.changes
+			.try_borrow_mut()
+			.map_err(|_| RewriterError::AlreadyRewriting)?;
+
+		slot.take()
+			.ok_or(RewriterError::AlreadyRewriting)
+			.and_then(|x| {
+				let mut x = unsafe {
+					std::mem::transmute::<JsChanges<'static, 'static>, JsChanges<'alloc, 'data>>(x)
+				};
+				x.set_alloc(alloc)?;
+				Ok(x)
+			})
+	}
+
+	fn put_changes<'alloc: 'data, 'data>(
+		&'data self,
+		mut changes: JsChanges<'alloc, 'data>,
+	) -> Result<(), RewriterError> {
+		if !changes.empty() {
+			return Err(RewriterError::Leftover);
+		}
+
+		let mut slot = self
+			.changes
+			.try_borrow_mut()
+			.map_err(|_| RewriterError::AlreadyRewriting)?;
+
+		if slot.is_some() {
+			Err(RewriterError::NotRewriting)
+		} else {
+			changes.take_alloc()?;
+
+			let changes = unsafe {
+				std::mem::transmute::<JsChanges<'alloc, 'data>, JsChanges<'static, 'static>>(
+					changes,
+				)
+			};
+
+			slot.replace(changes);
+
+			Ok(())
+		}
+	}
+
+	pub fn new(cfg: Config, url_rewriter: E) -> Self {
+		Self {
+			cfg,
+			url: url_rewriter,
+			changes: RefCell::new(Some(JsChanges::new())),
+		}
+	}
+
+	pub fn rewrite<'alloc: 'data, 'data>(
+		&'data self,
+		alloc: &'alloc Allocator,
+		js: &'data str,
+		flags: Flags,
+	) -> Result<RewriteResult<'alloc>, RewriterError> {
+		let source_type = SourceType::unambiguous()
+			.with_javascript(true)
+			.with_module(flags.is_module)
+			.with_standard(true);
+		let parsed = Parser::new(alloc, js, source_type)
+			.with_options(ParseOptions {
+				allow_v8_intrinsics: true,
+				allow_return_outside_function: true,
+				..Default::default()
+			})
+			.parse();
+
+		if parsed.panicked {
+			use std::fmt::Write;
+
+			let mut errors = String::new();
+			for error in parsed.errors {
+				writeln!(errors, "{error}")?;
+			}
+			return Err(RewriterError::OxcPanicked(errors));
+		}
+
+		let jschanges = self.take_changes(alloc)?;
+
+		let mut visitor = Visitor {
+			alloc,
+			jschanges,
+			error: None,
+
+			config: &self.cfg,
+			rewriter: &self.url,
+			flags,
+		};
+		visitor.visit_program(&parsed.program);
+		if let Some(error) = visitor.error {
+			return Err(RewriterError::Url(error));
+		}
+		let mut jschanges = visitor.jschanges;
+
+		let changed = jschanges.perform(js, &self.cfg, &visitor.flags)?;
+
+		self.put_changes(jschanges)?;
+
+		let js: Vec<'alloc, u8> = changed.source;
+		let sourcemap: Vec<'alloc, u8> = changed.map;
+
+		Ok(RewriteResult {
+			js,
+			sourcemap,
+			errors: parsed.errors,
+			flags: visitor.flags,
+		})
+	}
+}

rewriter/js/src/rewrite.rs

@@ -0,0 +1,152 @@
+use oxc::{
+	ast::ast::AssignmentOperator,
+	span::{Atom, Span},
+};
+use smallvec::{SmallVec, smallvec};
+
+use crate::changes::{JsChange, change};
+
+macro_rules! rewrite {
+    ($span:expr, $($ty:tt)*) => {
+		$crate::rewrite::Rewrite::new($span, $crate::rewrite::RewriteType::$($ty)*)
+    };
+}
+pub(crate) use rewrite;
+
+#[derive(Debug, PartialEq, Eq)]
+pub(crate) enum RewriteType<'alloc: 'data, 'data> {
+	/// `(cfg.wrapfn(ident,strictchecker))` | `cfg.wrapfn(ident,strictchecker)`
+	WrapFn {
+		wrap: bool,
+	},
+	/// `cfg.setrealmfn({}).ident`
+	SetRealmFn,
+	/// `cfg.wrapthis(this)`
+	WrapThisFn,
+	/// `(cfg.importfn("cfg.base"))`
+	ImportFn,
+	/// `cfg.metafn("cfg.base")`
+	MetaFn,
+
+	// dead code only if debug is disabled
+	#[allow(dead_code)]
+	/// `$scramerr(name)`
+	ScramErr {
+		ident: Atom<'data>,
+	},
+	/// `$scramitize(span)`
+	Scramitize,
+
+	/// `eval(cfg.rewritefn(inner))`
+	Eval {
+		inner: Span,
+	},
+	/// `((t)=>$scramjet$tryset(name,"op",t)||(name op t))(rhs)`
+	Assignment {
+		name: Atom<'data>,
+		rhs: Span,
+		op: AssignmentOperator,
+	},
+	/// `ident,` -> `ident: cfg.wrapfn(ident),`
+	ShorthandObj {
+		name: Atom<'data>,
+	},
+	SourceTag,
+
+	// don't use for anything static, only use for stuff like rewriteurl
+	Replace {
+		text: &'alloc str,
+	},
+	Delete,
+}
+
+pub(crate) struct Rewrite<'alloc, 'data> {
+	span: Span,
+	ty: RewriteType<'alloc, 'data>,
+}
+
+impl<'alloc: 'data, 'data> Rewrite<'alloc, 'data> {
+	pub fn new(span: Span, ty: RewriteType<'alloc, 'data>) -> Self {
+		Self { span, ty }
+	}
+
+	pub fn into_inner(self) -> SmallVec<[JsChange<'alloc, 'data>; 2]> {
+		self.ty.into_inner(self.span)
+	}
+}
+
+impl<'alloc: 'data, 'data> RewriteType<'alloc, 'data> {
+	fn into_inner(self, span: Span) -> SmallVec<[JsChange<'alloc, 'data>; 2]> {
+		macro_rules! span {
+			(start) => {
+				Span::new(span.start, span.start)
+			};
+			(end) => {
+				Span::new(span.end, span.end)
+			};
+			($span1:ident $span2:ident start) => {
+				Span::new($span1.start, $span2.start)
+			};
+			($span1:ident $span2:ident end) => {
+				Span::new($span1.end, $span2.end)
+			};
+		}
+
+		match self {
+			Self::WrapFn { wrap } => smallvec![
+				change!(span!(start), WrapFnLeft { wrap }),
+				change!(span!(end), WrapFnRight { wrap }),
+			],
+			Self::SetRealmFn => smallvec![change!(span, SetRealmFn)],
+			Self::WrapThisFn => smallvec![
+				change!(span!(start), WrapThisFn),
+				change!(
+					span!(end),
+					ClosingParen {
+						semi: false,
+						replace: false
+					}
+				),
+			],
+			Self::ImportFn => smallvec![change!(span, ImportFn)],
+			Self::MetaFn => smallvec![change!(span, MetaFn)],
+			Self::ScramErr { ident } => smallvec![change!(span!(end), ScramErrFn { ident })],
+			Self::Scramitize => smallvec![
+				change!(span!(start), ScramitizeFn),
+				change!(
+					span!(end),
+					ClosingParen {
+						semi: false,
+						replace: false
+					}
+				)
+			],
+			Self::Eval { inner } => smallvec![
+				change!(span!(span inner start), EvalRewriteFn),
+				change!(
+					span!(inner span end),
+					ClosingParen {
+						semi: false,
+						replace: true
+					}
+				)
+			],
+			Self::Assignment { name, rhs, op } => smallvec![
+				change!(span!(span rhs start), AssignmentLeft { name, op }),
+				change!(
+					span!(rhs span end),
+					ClosingParen {
+						semi: false,
+						replace: true
+					}
+				)
+			],
+			Self::ShorthandObj { name } => {
+				smallvec![change!(span!(end), ShorthandObj { ident: name })]
+			}
+			Self::SourceTag => smallvec![change!(span, SourceTag)],
+			Self::Replace { text } => smallvec![change!(span, Replace { text })],
+			Self::Delete => smallvec![change!(span, Delete)],
+		}
+	}
+}

rewriter/js/src/visitor.rs

@@ -0,0 +1,313 @@
+use std::error::Error;
+
+use oxc::{
+	allocator::{Allocator, StringBuilder},
+	ast::ast::{
+		AssignmentExpression, AssignmentTarget, CallExpression, DebuggerStatement,
+		ExportAllDeclaration, ExportNamedDeclaration, Expression, FunctionBody,
+		IdentifierReference, ImportDeclaration, ImportExpression, MemberExpression, MetaProperty,
+		NewExpression, ObjectExpression, ObjectPropertyKind, ReturnStatement, StringLiteral,
+		ThisExpression, UnaryExpression, UnaryOperator, UpdateExpression,
+	},
+	ast_visit::{Visit, walk},
+	span::{Atom, GetSpan, Span},
+};
+
+use crate::{
+	cfg::{Config, Flags, UrlRewriter},
+	changes::JsChanges,
+	rewrite::rewrite,
+};
+
+// js MUST not be able to get a reference to any of these because sbx
+//
+// maybe move this out of this lib?
+const UNSAFE_GLOBALS: &[&str] = &[
+	"window",
+	"self",
+	"globalThis",
+	"this",
+	"parent",
+	"top",
+	"location",
+	"document",
+	"eval",
+	"frames",
+];
+
+pub struct Visitor<'alloc, 'data, E>
+where
+	E: UrlRewriter,
+{
+	pub alloc: &'alloc Allocator,
+	pub jschanges: JsChanges<'alloc, 'data>,
+	pub error: Option<Box<dyn Error + Sync + Send>>,
+
+	pub config: &'data Config,
+	pub rewriter: &'data E,
+	pub flags: Flags,
+}
+
+impl<'data, E> Visitor<'_, 'data, E>
+where
+	E: UrlRewriter,
+{
+	fn rewrite_url(&mut self, url: &StringLiteral<'data>, module: bool) {
+		let mut builder = StringBuilder::from_str_in(&self.config.prefix, self.alloc);
+		if self.error.is_some() {
+			builder.push_str("__URL_REWRITER_ALREADY_ERRORED__");
+		} else if let Err(err) =
+			self.rewriter
+				.rewrite(self.config, &self.flags, &url.value, &mut builder, module)
+		{
+			self.error.replace(err);
+			builder.push_str("__URL_REWRITER_ERROR__");
+		}
+		let text = builder.into_str();
+
+		self.jschanges
+			.add(rewrite!(url.span.shrink(1), Replace { text }));
+	}
+
+	fn rewrite_ident(&mut self, name: &Atom, span: Span) {
+		if UNSAFE_GLOBALS.contains(&name.as_str()) {
+			self.jschanges.add(rewrite!(span, WrapFn { wrap: true }));
+		}
+	}
+
+	fn walk_member_expression(&mut self, it: &Expression) -> bool {
+		match it {
+			Expression::Identifier(s) => {
+				self.rewrite_ident(&s.name, s.span);
+				true
+			}
+			Expression::StaticMemberExpression(s) => self.walk_member_expression(&s.object),
+			Expression::ComputedMemberExpression(s) => self.walk_member_expression(&s.object),
+			_ => false,
+		}
+	}
+
+	fn scramitize(&mut self, span: Span) {
+		self.jschanges.add(rewrite!(span, Scramitize));
+	}
+}
+
+impl<'data, E> Visit<'data> for Visitor<'_, 'data, E>
+where
+	E: UrlRewriter,
+{
+	fn visit_identifier_reference(&mut self, it: &IdentifierReference) {
+		// if self.config.capture_errors {
+		// 	self.jschanges.insert(JsChange::GenericChange {
+		// 		span: it.span,
+		// 		text: format!(
+		// 			"{}({}, typeof arguments != 'undefined' && arguments)",
+		// 			self.config.wrapfn, it.name
+		// 		),
+		// 	});
+		// } else {
+		//
+		if UNSAFE_GLOBALS.contains(&it.name.as_str()) {
+			self.jschanges
+				.add(rewrite!(it.span, WrapFn { wrap: false }));
+		}
+		// }
+	}
+
+	fn visit_new_expression(&mut self, it: &NewExpression<'data>) {
+		self.walk_member_expression(&it.callee);
+		walk::walk_arguments(self, &it.arguments);
+	}
+
+	fn visit_member_expression(&mut self, it: &MemberExpression<'data>) {
+		// TODO
+		// you could break this with ["postMessage"] etc
+		// however this code only exists because of recaptcha whatever
+		// and it would slow down js execution a lot
+		if let MemberExpression::StaticMemberExpression(s) = it {
+			if s.property.name == "postMessage" {
+				self.jschanges.add(rewrite!(s.property.span, SetRealmFn));
+
+				walk::walk_expression(self, &s.object);
+				return; // unwise to walk the rest of the tree
+			}
+
+			if !self.flags.strict_rewrites
+				&& !UNSAFE_GLOBALS.contains(&s.property.name.as_str())
+				&& let Expression::Identifier(_) | Expression::ThisExpression(_) = &s.object
+			{
+				// cull tree - this should be safe
+				return;
+			}
+
+			if self.flags.scramitize
+				&& !matches!(s.object, Expression::MetaProperty(_) | Expression::Super(_))
+			{
+				self.scramitize(s.object.span());
+			}
+		}
+
+		walk::walk_member_expression(self, it);
+	}
+	fn visit_this_expression(&mut self, it: &ThisExpression) {
+		self.jschanges.add(rewrite!(it.span, WrapThisFn));
+	}
+
+	fn visit_debugger_statement(&mut self, it: &DebuggerStatement) {
+		// delete debugger statements entirely. some sites will spam debugger as an anti-debugging measure, and we don't want that!
+		self.jschanges.add(rewrite!(it.span, Delete));
+	}
+
+	// we can't overwrite window.eval in the normal way because that would make everything an
+	// indirect eval, which could break things. we handle that edge case here
+	fn visit_call_expression(&mut self, it: &CallExpression<'data>) {
+		if let Expression::Identifier(s) = &it.callee {
+			// if it's optional that actually makes it an indirect eval which is handled separately
+			if s.name == "eval" && !it.optional {
+				self.jschanges.add(rewrite!(
+					it.span,
+					Eval {
+						inner: Span::new(s.span.end + 1, it.span.end),
+					}
+				));
+
+				// then we walk the arguments, but not the callee, since we want it to resolve to
+				// the real eval
+				walk::walk_arguments(self, &it.arguments);
+				return;
+			}
+		}
+		if self.flags.scramitize {
+			self.scramitize(it.span);
+		}
+		walk::walk_call_expression(self, it);
+	}
+
+	fn visit_import_declaration(&mut self, it: &ImportDeclaration<'data>) {
+		self.rewrite_url(&it.source, true);
+		walk::walk_import_declaration(self, it);
+	}
+	fn visit_import_expression(&mut self, it: &ImportExpression<'data>) {
+		self.jschanges.add(rewrite!(
+			Span::new(it.span.start, it.span.start + 7),
+			ImportFn
+		));
+		walk::walk_import_expression(self, it);
+	}
+
+	fn visit_export_all_declaration(&mut self, it: &ExportAllDeclaration<'data>) {
+		self.rewrite_url(&it.source, true);
+	}
+	fn visit_export_named_declaration(&mut self, it: &ExportNamedDeclaration<'data>) {
+		if let Some(source) = &it.source {
+			self.rewrite_url(source, true);
+		}
+		// do not walk further, we don't want to rewrite the identifiers
+	}
+
+	#[cfg(feature = "debug")]
+	fn visit_try_statement(&mut self, it: &oxc::ast::ast::TryStatement<'data>) {
+		// for debugging we need to know what the error was
+
+		if self.flags.capture_errors
+			&& let Some(h) = &it.handler
+			&& let Some(name) = &h.param
+			&& let Some(ident) = name.pattern.get_identifier_name()
+		{
+			let start = h.body.span.start + 1;
+			self.jschanges
+				.add(rewrite!(Span::new(start, start), ScramErr { ident }));
+		}
+
+		walk::walk_try_statement(self, it);
+	}
+
+	fn visit_object_expression(&mut self, it: &ObjectExpression<'data>) {
+		for prop in &it.properties {
+			if let ObjectPropertyKind::ObjectProperty(p) = prop
+				&& let Expression::Identifier(s) = &p.value
+				&& UNSAFE_GLOBALS.contains(&s.name.to_string().as_str())
+				&& p.shorthand
+			{
+				self.jschanges
+					.add(rewrite!(s.span, ShorthandObj { name: s.name }));
+				return;
+			}
+		}
+
+		walk::walk_object_expression(self, it);
+	}
+
+	fn visit_function_body(&mut self, it: &FunctionBody<'data>) {
+		// tag function for use in sourcemaps
+		if self.flags.do_sourcemaps {
+			self.jschanges
+				.add(rewrite!(Span::new(it.span.start, it.span.start), SourceTag));
+		}
+		walk::walk_function_body(self, it);
+	}
+
+	fn visit_return_statement(&mut self, it: &ReturnStatement<'data>) {
+		// if let Some(arg) = &it.argument {
+		// 	self.jschanges.insert(JsChange::GenericChange {
+		// 		span: Span::new(it.span.start + 6, it.span.start + 6),
+		// 		text: format!(" $scramdbg((()=>{{ try {{return arguments}} catch(_){{}} }})(),("),
+		// 	});
+		// 	self.jschanges.insert(JsChange::GenericChange {
+		// 		span: Span::new(expression_span(arg).end, expression_span(arg).end),
+		// 		text: format!("))"),
+		// 	});
+		// }
+		walk::walk_return_statement(self, it);
+	}
+
+	fn visit_unary_expression(&mut self, it: &UnaryExpression<'data>) {
+		if matches!(it.operator, UnaryOperator::Typeof) {
+			// don't walk to identifier rewrites since it won't matter
+			return;
+		}
+		walk::walk_unary_expression(self, it);
+	}
+
+	fn visit_update_expression(&mut self, _it: &UpdateExpression<'data>) {
+		// then no, don't walk it, we don't care
+	}
+
+	fn visit_meta_property(&mut self, it: &MetaProperty<'data>) {
+		if it.meta.name == "import" {
+			self.jschanges.add(rewrite!(it.span, MetaFn));
+		}
+	}
+
+	fn visit_assignment_expression(&mut self, it: &AssignmentExpression<'data>) {
+		match &it.left {
+			AssignmentTarget::AssignmentTargetIdentifier(s) => {
+				if ["location"].contains(&s.name.to_string().as_str()) {
+					self.jschanges.add(rewrite!(
+						it.span,
+						Assignment {
+							name: s.name,
+							rhs: it.right.span(),
+							op: it.operator,
+						}
+					));
+
+					// avoid walking rest of tree, i would need to figure out nested rewrites
+					// somehow
+					return;
+				}
+			}
+			AssignmentTarget::ArrayAssignmentTarget(_) => {
+				// [location] = ["https://example.com"]
+				// this is such a ridiculously specific edge case. just ignore it
+				return;
+			}
+			_ => {
+				// only walk the left side if it isn't an identifier, we can't replace the
+				// identifier with a function obviously
+				walk::walk_assignment_target(self, &it.left);
+			}
+		}
+		walk::walk_expression(self, &it.right);
+	}
+}

rewriter/native/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "native"
+version = "0.1.0"
+edition = "2024"
+
+[lints]
+workspace = true
+
+[dependencies]
+anyhow = "1.0.97"
+bytes = "1.10.1"
+oxc = { workspace = true }
+js = { version = "0.1.0", path = "../js", default-features = false }
+url = "2.5.4"
+urlencoding = "2.1.3"
+clap = { version = "4.5.39", features = ["cargo", "derive"] }
+html = { version = "0.1.0", path = "../html" }
+
+[features]
+debug = ["js/debug"]
+
+[dev-dependencies]
+boa_engine = "0.20.0"

rewriter/native/src/main.rs

@@ -0,0 +1,180 @@
+use std::{
+	env,
+	ffi::OsString,
+	fs,
+	path::PathBuf,
+	sync::Arc,
+	time::{Duration, Instant},
+};
+
+use anyhow::{Context, Result};
+use clap::Parser;
+use html::{Rewriter, attrmap, rule::RewriteRule};
+use oxc::{
+	allocator::{Allocator, StringBuilder},
+	diagnostics::NamedSource,
+};
+use rewriter::NativeRewriter;
+
+mod rewriter;
+mod test_runner;
+
+#[derive(Parser)]
+pub struct RewriterOptions {
+	#[clap(long, default_value = "/scrammedjet/")]
+	prefix: String,
+	#[clap(long, default_value = "$wrap")]
+	wrapfn: String,
+	#[clap(long, default_value = "$gwrap")]
+	wrapthisfn: String,
+	#[clap(long, default_value = "$import")]
+	importfn: String,
+	#[clap(long, default_value = "$rewrite")]
+	rewritefn: String,
+	#[clap(long, default_value = "$meta")]
+	metafn: String,
+	#[clap(long, default_value = "$setrealm")]
+	setrealmfn: String,
+	#[clap(long, default_value = "$pushsourcemap")]
+	pushsourcemapfn: String,
+
+	#[clap(long, default_value = "https://google.com/glorngle/si.js")]
+	base: String,
+	#[clap(long, default_value = "glongle1")]
+	sourcetag: String,
+
+	#[clap(long, default_value_t = false)]
+	is_module: bool,
+	#[clap(long, default_value_t = false)]
+	capture_errors: bool,
+	#[clap(long, default_value_t = false)]
+	do_sourcemaps: bool,
+	#[clap(long, default_value_t = false)]
+	scramitize: bool,
+	#[clap(long, default_value_t = false)]
+	strict_rewrites: bool,
+}
+
+impl Default for RewriterOptions {
+	fn default() -> Self {
+		Self::parse_from(std::iter::empty::<OsString>())
+	}
+}
+
+#[derive(Parser)]
+#[command(version = clap::crate_version!())]
+pub enum Cli {
+	/// Rewrite a file
+	Rewrite {
+		file: PathBuf,
+		#[clap(flatten)]
+		config: RewriterOptions,
+	},
+	/// Rewrite a file multiple times for flamegraphing
+	Bench {
+		file: PathBuf,
+		iterations: u32,
+		#[clap(flatten)]
+		config: RewriterOptions,
+	},
+	Html {
+		file: PathBuf,
+	},
+}
+
+fn main() -> Result<()> {
+	let args = Cli::parse();
+
+	match args {
+		Cli::Rewrite { file, config } => {
+			let mut rewriter = NativeRewriter::new(&config);
+
+			let data = fs::read_to_string(file).context("failed to read file")?;
+
+			let res = rewriter.rewrite(&data, &config)?;
+
+			let source =
+				Arc::new(NamedSource::new(data.clone(), config.base).with_language("javascript"));
+
+			println!(
+				"rewritten:\n{}",
+				str::from_utf8(&res.js).context("failed to parse rewritten js")?
+			);
+
+			let unrewritten = NativeRewriter::unrewrite(&res);
+
+			eprintln!("errors:");
+			for err in res.errors {
+				eprintln!("{}", err.with_source_code(source.clone()));
+			}
+
+			rewriter.reset();
+
+			println!(
+				"unrewritten matches orig: {}",
+				data.as_bytes() == unrewritten.as_slice()
+			);
+		}
+		Cli::Bench {
+			file,
+			iterations,
+			config,
+		} => {
+			let mut rewriter = NativeRewriter::new(&config);
+
+			let data = fs::read_to_string(file).context("failed to read file")?;
+			let mut duration = Duration::from_secs(0);
+
+			let cnt = iterations * 100;
+
+			for x in 1..=cnt {
+				let before = Instant::now();
+				rewriter
+					.rewrite(&data, &config)
+					.context("failed to rewrite")?;
+				let after = Instant::now();
+
+				rewriter.reset();
+
+				duration += after - before;
+
+				if x % 100 == 0 {
+					println!("{x}...");
+				}
+			}
+
+			println!("iterations: {cnt}");
+			println!("total time: {duration:?}");
+			println!("avg time: {:?}", duration / cnt);
+		}
+		Cli::Html { file } => {
+			let data = fs::read_to_string(file).context("failed to read file")?;
+
+			let mut alloc = Allocator::new();
+
+			let rules = vec![RewriteRule {
+				attrs: attrmap!({
+					"href": ["a", "link"]
+				}),
+				func: Box::new(|alloc, x, ()| {
+					let mut build = StringBuilder::from_str_in(x, alloc);
+					build.push_str(" :3");
+					Ok(Some(build.into_str()))
+				}),
+			}];
+
+			let rewriter = Rewriter::new(
+				rules,
+				Box::new(|_, _, ()| Ok(Some("__EXTERNAL_TOOL_VAL__"))),
+			)?;
+
+			let ret = rewriter.rewrite(&alloc, &data, &(), true)?;
+
+			println!("{}", str::from_utf8(&ret)?);
+
+			alloc.reset();
+		}
+	}
+
+	Ok(())
+}

rewriter/native/src/rewriter.rs

@@ -0,0 +1,154 @@
+use std::{error::Error, str::FromStr};
+
+use anyhow::{Context, Result};
+use bytes::Buf;
+use js::{
+	RewriteResult, Rewriter,
+	cfg::{Config, Flags, UrlRewriter},
+};
+use oxc::allocator::{Allocator, StringBuilder};
+use url::Url;
+use urlencoding::encode;
+
+use crate::RewriterOptions;
+
+struct NativeUrlRewriter;
+
+impl UrlRewriter for NativeUrlRewriter {
+	fn rewrite(
+		&self,
+		_cfg: &Config,
+		flags: &Flags,
+		url: &str,
+		builder: &mut StringBuilder,
+		_module: bool,
+	) -> Result<(), Box<dyn Error + Sync + Send>> {
+		let base = Url::from_str(&flags.base)?;
+		builder.push_str(encode(base.join(url)?.as_str()).as_ref());
+
+		Ok(())
+	}
+}
+
+#[derive(Debug)]
+enum RewriteType<'a> {
+	Insert { pos: u32, size: u32 },
+	Replace { start: u32, end: u32, str: &'a [u8] },
+}
+
+pub struct NativeRewriter {
+	alloc: Allocator,
+	rewriter: Rewriter<NativeUrlRewriter>,
+}
+
+impl NativeRewriter {
+	#[allow(dead_code)]
+	pub fn default() -> Self {
+		Self::new(&RewriterOptions::default())
+	}
+
+	pub fn new(cfg: &RewriterOptions) -> Self {
+		let rewriter = Rewriter::new(
+			Config {
+				prefix: cfg.prefix.clone(),
+				wrapfn: cfg.wrapfn.clone(),
+				wrapthisfn: cfg.wrapthisfn.clone(),
+				importfn: cfg.importfn.clone(),
+				rewritefn: cfg.rewritefn.clone(),
+				metafn: cfg.metafn.clone(),
+				setrealmfn: cfg.setrealmfn.clone(),
+				pushsourcemapfn: cfg.pushsourcemapfn.clone(),
+			},
+			NativeUrlRewriter,
+		);
+
+		Self {
+			alloc: Allocator::new(),
+			rewriter,
+		}
+	}
+
+	#[allow(dead_code)]
+	pub fn rewrite_default(&self, data: &str) -> Result<RewriteResult<'_>> {
+		self.rewrite(data, &RewriterOptions::default())
+	}
+
+	pub fn rewrite(&self, data: &str, cfg: &RewriterOptions) -> Result<RewriteResult<'_>> {
+		self.rewriter
+			.rewrite(
+				&self.alloc,
+				data,
+				Flags {
+					base: cfg.base.clone(),
+					sourcetag: cfg.sourcetag.clone(),
+
+					is_module: cfg.is_module,
+
+					capture_errors: cfg.capture_errors,
+					do_sourcemaps: cfg.do_sourcemaps,
+					scramitize: cfg.scramitize,
+					strict_rewrites: cfg.strict_rewrites,
+				},
+			)
+			.context("failed to rewrite file")
+	}
+	pub fn reset(&mut self) {
+		self.alloc.reset();
+	}
+
+	pub fn unrewrite(res: &RewriteResult) -> Vec<u8> {
+		let js = res.js.as_slice();
+		let mut map = res.sourcemap.as_slice();
+		let rewrite_cnt = map.get_u32_le();
+		let mut rewrites = Vec::with_capacity(rewrite_cnt as usize);
+
+		for x in 0..rewrite_cnt {
+			let pos = map.get_u32_le();
+			let size = map.get_u32_le();
+
+			let ty = map.get_u8();
+			if ty == 0 {
+				rewrites.push(RewriteType::Insert { pos, size });
+			} else if ty == 1 {
+				let len = map.get_u32_le();
+
+				let (str, new) = map.split_at(len as usize);
+				map = new;
+
+				rewrites.push(RewriteType::Replace {
+					start: pos,
+					end: pos + size,
+					str,
+				});
+			} else {
+				panic!(
+					"{x} {ty} {:X?} {:#?}",
+					&map[0..10],
+					&rewrites.last_chunk::<3>()
+				)
+			}
+		}
+
+		let mut out = Vec::with_capacity(res.js.len());
+
+		let mut cursor: u32 = 0;
+
+		for rewrite in rewrites {
+			match rewrite {
+				RewriteType::Insert { pos, size } => {
+					out.extend_from_slice(&js[cursor as usize..pos as usize]);
+					cursor = pos + size;
+				}
+				RewriteType::Replace { start, end, str } => {
+					out.extend_from_slice(&js[cursor as usize..start as usize]);
+					out.extend_from_slice(&str);
+					cursor = end;
+				}
+			}
+		}
+
+		out.extend_from_slice(&js[cursor as usize..]);
+
+		out.to_vec()
+	}
+}

rewriter/native/src/test_runner.rs

@@ -0,0 +1,110 @@
+#[cfg(test)]
+mod test {
+	use std::fs;
+
+	use crate::rewriter::NativeRewriter;
+	use boa_engine::{
+		Context, NativeFunction, Source, js_str, js_string,
+		object::ObjectInitializer,
+		property::{Attribute, PropertyDescriptorBuilder},
+	};
+
+	fn create_context() -> Context {
+		let mut context = Context::default();
+
+		let window = ObjectInitializer::new(&mut context).build();
+		context
+			.register_global_property(js_str!("window"), window, Attribute::READONLY)
+			.unwrap();
+		context
+			.global_object()
+			.define_property_or_throw(
+				js_str!("location"),
+				PropertyDescriptorBuilder::new()
+					.get(
+						NativeFunction::from_copy_closure(|_, _, _| Ok(js_str!("location").into()))
+							.to_js_function(context.realm()),
+					)
+					.set(
+						NativeFunction::from_copy_closure(|_, _, _| {
+							panic!("fail: window.location got set")
+						})
+						.to_js_function(context.realm()),
+					)
+					.build(),
+				&mut context,
+			)
+			.unwrap();
+
+		context
+			.register_global_callable(
+				js_string!("fail"),
+				0,
+				NativeFunction::from_copy_closure(|_, _, _| {
+					panic!("fail");
+				}),
+			)
+			.unwrap();
+
+		context
+			.eval(Source::from_bytes(
+				br#"
+function $wrap(val) {
+	if (val === window || val === "location" || val === globalThis) return "";
+
+    return val;
+}
+
+const $gwrap = $wrap;
+
+function $scramitize(val) { return val }
+
+function assert(val) {
+	if (!val) fail();
+}
+
+function check(val) {
+    if (val === window || val === "location") fail();
+}
+			    "#,
+			))
+			.unwrap();
+
+		context
+	}
+
+	#[test]
+	fn google() {
+		let source_text = include_str!("../sample/google.js");
+
+		let rewriter = NativeRewriter::default();
+		rewriter.rewrite_default(source_text).unwrap();
+	}
+
+	#[test]
+	fn rewrite_tests() {
+		let files = fs::read_dir("./tests").unwrap();
+
+		let mut rewriter = NativeRewriter::default();
+
+		for file in files.map(|x| x.unwrap()) {
+			if !file.path().extension().unwrap().eq_ignore_ascii_case("js") {
+				continue;
+			}
+
+			let content = fs::read_to_string(file.path()).unwrap();
+
+			let rewritten = rewriter.rewrite_default(&content).unwrap();
+			println!("{}", std::str::from_utf8(&rewritten.js).unwrap());
+
+			let mut ctx = create_context();
+
+			ctx.eval(Source::from_bytes(rewritten.js.as_slice()))
+				.unwrap();
+
+			println!("PASS");
+
+			rewriter.reset();
+		}
+	}
+}

rewriter/native/test.html

@@ -0,0 +1,8 @@
+<head a=b>:3:3:3:3;#:</head>
+
+<a href="goog" onclick=glorngle>test</a>
+<script type=module src=glorngle.js></script>
+<meta http-equiv=content-security-policy />
+<script>
+	glorngle.js();
+</script>

rewriter/native/test.js

@@ -0,0 +1,36 @@
+window.location.href = "http://example.com";
+
+console.log(top.window.aaa);
+consle.log(globalThis["win" + "dow"]);
+
+globalThis.eval("..");
+
+let ref = { b: this.top.window, c: globalThis["win" + "dow"] };
+
+
+export default ref;
+
+export { ref };
+
+
+export { ref as default };
+
+export { S } from "module";
+export * from "module";
+import sd from "d"
+
+location += "http://example.com";
+
+function f() { return import("x") }
+
+
+let window = (1, window);
+
+let x = new this.Abc();
+
+try{}catch(e){this.a.log()};
+
+await import("test")
+
+
+import{c as d,u as g,a as l,r as i,b,d as m,g as p,e as h,f as v,h as k}from"./1e3cB0WW.js";

rewriter/native/tests/0-sanity.js

@@ -0,0 +1,5 @@
+check(window);
+check(this);
+check(globalThis);
+check(location);
+check(globalThis["win" + "dow"])

rewriter/native/tests/1-destructure.js

@@ -0,0 +1,3 @@
+const { location: x } = globalThis;
+
+check(x);

rewriter/native/tests/2-function-default.js

@@ -0,0 +1,6 @@
+function f(g = globalThis, l = location) {
+  check(g);
+  check(l);
+}
+
+f();

rewriter/native/tests/3-shadow-globals.js

@@ -0,0 +1,7 @@
+
+function f(location, globalThis) {
+  assert(location === 1)
+  assert(globalThis === 2)
+}
+
+f(1, 2);

rewriter/native/tests/eval-overridden-globals.js.disabled

@@ -0,0 +1,8 @@
+
+let reached = false
+let eval = (t) => t === "location = 1" && (reached = true)
+
+// testing to make sure this doesn't get rewritten
+eval("location = 1")
+
+if (!reached) fail();

rewriter/native/tests/for-assignment.js.disabled

@@ -0,0 +1,3 @@
+for (location of ["https://google.com"]) {
+  //
+}