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{"version":3,"sources":["../src/MemoryLeakError.ts","../src/Emitter.ts"],"sourcesContent":["import type { Emitter } from './Emitter'\n\nexport class MemoryLeakError extends Error {\n constructor(\n public readonly emitter: Emitter<any>,\n public readonly type: string | number | symbol,\n public readonly count: number\n ) {\n super(\n `Possible EventEmitter memory leak detected. ${count} ${type.toString()} listeners added. Use emitter.setMaxListeners() to increase limit`\n )\n this.name = 'MaxListenersExceededWarning'\n }\n}\n","import { MemoryLeakError } from './MemoryLeakError'\n\nexport type EventMap = {\n [eventName: string]: Array<unknown>\n}\n\nexport type InternalEventNames = 'newListener' | 'removeListener'\n\nexport type InternalListener<Events extends EventMap> = Listener<\n [eventName: keyof Events, listener: Listener<Array<unknown>>]\n>\n\nexport type Listener<Data extends Array<unknown>> = (...data: Data) => void\n\n/**\n * Node.js-compatible implementation of `EventEmitter`.\n *\n * @example\n * const emitter = new Emitter<{ hello: [string] }>()\n * emitter.on('hello', (name) => console.log(name))\n * emitter.emit('hello', 'John')\n */\nexport class Emitter<Events extends EventMap> {\n private events: Map<keyof Events, Array<Listener<any>>>\n private maxListeners: number\n private hasWarnedAboutPotentialMemoryLeak: boolean\n\n static defaultMaxListeners = 10\n\n static listenerCount<Events extends EventMap>(\n emitter: Emitter<EventMap>,\n eventName: keyof Events\n ): number {\n return emitter.listenerCount<any>(eventName)\n }\n\n constructor() {\n this.events = new Map()\n this.maxListeners = Emitter.defaultMaxListeners\n this.hasWarnedAboutPotentialMemoryLeak = false\n }\n\n private _emitInternalEvent(\n internalEventName: InternalEventNames,\n eventName: keyof Events,\n listener: Listener<Array<unknown>>\n ): void {\n this.emit(\n internalEventName,\n // Anything to make TypeScript happy.\n ...([eventName, listener] as Events['newListener'] &\n Events['removeListener'])\n )\n }\n\n private _getListeners<EventName extends keyof Events>(\n eventName: EventName\n ): Array<Listener<Array<unknown>>> {\n // Always return a copy of the listeners array\n // so they are fixed at the time of the \"_getListeners\" call.\n return Array.prototype.concat.apply([], this.events.get(eventName)) || []\n }\n\n private _removeListener<EventName extends keyof Events>(\n listeners: Array<Listener<Events[EventName]>>,\n listener: Listener<Events[EventName]>\n ): Array<Listener<Events[EventName]>> {\n const index = listeners.indexOf(listener)\n\n if (index > -1) {\n listeners.splice(index, 1)\n }\n\n return []\n }\n\n private _wrapOnceListener<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): Listener<Events[EventName]> {\n const onceListener = (...data: Events[keyof Events]) => {\n this.removeListener(eventName, onceListener)\n\n /**\n * @note Return the result of the original listener.\n * This way this wrapped preserves listeners that are async.\n */\n return listener.apply(this, data)\n }\n\n // Inherit the name of the original listener.\n Object.defineProperty(onceListener, 'name', { value: listener.name })\n\n return onceListener\n }\n\n public setMaxListeners(maxListeners: number): this {\n this.maxListeners = maxListeners\n return this\n }\n\n /**\n * Returns the current max listener value for the `Emitter` which is\n * either set by `emitter.setMaxListeners(n)` or defaults to\n * `Emitter.defaultMaxListeners`.\n */\n public getMaxListeners(): number {\n return this.maxListeners\n }\n\n /**\n * Returns an array listing the events for which the emitter has registered listeners.\n * The values in the array will be strings or Symbols.\n */\n public eventNames(): Array<keyof Events> {\n return Array.from(this.events.keys())\n }\n\n /**\n * Synchronously calls each of the listeners registered for the event named `eventName`,\n * in the order they were registered, passing the supplied arguments to each.\n * Returns `true` if the event has listeners, `false` otherwise.\n *\n * @example\n * const emitter = new Emitter<{ hello: [string] }>()\n * emitter.emit('hello', 'John')\n */\n public emit<EventName extends keyof Events>(\n eventName: EventName,\n ...data: Events[EventName]\n ): boolean {\n const listeners = this._getListeners(eventName)\n listeners.forEach((listener) => {\n listener.apply(this, data)\n })\n\n return listeners.length > 0\n }\n\n public addListener(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public addListener<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public addListener(\n eventName: InternalEventNames | keyof Events,\n listener: InternalListener<Events> | Listener<Events[any]>\n ): this {\n // Emit the `newListener` event before adding the listener.\n this._emitInternalEvent('newListener', eventName, listener)\n\n const nextListeners = this._getListeners(eventName).concat(listener)\n this.events.set(eventName, nextListeners)\n\n if (\n this.maxListeners > 0 &&\n this.listenerCount(eventName) > this.maxListeners &&\n !this.hasWarnedAboutPotentialMemoryLeak\n ) {\n this.hasWarnedAboutPotentialMemoryLeak = true\n\n const memoryLeakWarning = new MemoryLeakError(\n this,\n eventName,\n this.listenerCount(eventName)\n )\n console.warn(memoryLeakWarning)\n }\n\n return this\n }\n\n public on(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public on<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public on<EventName extends keyof Events>(\n eventName: 'removeListener' | EventName,\n listener: Listener<any>\n ): this {\n return this.addListener(eventName, listener)\n }\n\n public once(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public once<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public once<EventName extends keyof Events>(\n eventName: InternalEventNames | EventName,\n listener: Listener<any>\n ): this {\n return this.addListener(\n eventName,\n this._wrapOnceListener(eventName, listener)\n )\n }\n\n public prependListener(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public prependListener<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public prependListener(\n eventName: InternalEventNames | keyof Events,\n listener: Listener<any>\n ): this {\n const listeners = this._getListeners(eventName)\n\n if (listeners.length > 0) {\n const nextListeners = [listener].concat(listeners)\n this.events.set(eventName, nextListeners)\n } else {\n this.events.set(eventName, listeners.concat(listener))\n }\n\n return this\n }\n\n public prependOnceListener(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public prependOnceListener<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public prependOnceListener(\n eventName: InternalEventNames | keyof Events,\n listener: Listener<any>\n ): this {\n return this.prependListener(\n eventName,\n this._wrapOnceListener(eventName, listener)\n )\n }\n\n public removeListener(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public removeListener<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n public removeListener(\n eventName: InternalEventNames | keyof Events,\n listener: Listener<any>\n ): this {\n const listeners = this._getListeners(eventName)\n\n if (listeners.length > 0) {\n this._removeListener(listeners, listener)\n this.events.set(eventName, listeners)\n\n // Emit the `removeListener` event after removing the listener.\n this._emitInternalEvent('removeListener', eventName, listener)\n }\n\n return this\n }\n\n public off(\n eventName: InternalEventNames,\n listener: InternalListener<Events>\n ): this\n public off<EventName extends keyof Events>(\n eventName: EventName,\n listener: Listener<Events[EventName]>\n ): this\n /**\n * Alias for `emitter.removeListener()`.\n *\n * @example\n * emitter.off('hello', listener)\n */\n public off(\n eventName: InternalEventNames | keyof Events,\n listener: Listener<any>\n ): this {\n return this.removeListener(eventName, listener)\n }\n\n public removeAllListeners(eventName?: InternalEventNames): this\n public removeAllListeners<EventName extends keyof Events>(\n eventName?: EventName\n ): this\n public removeAllListeners(\n eventName?: InternalEventNames | keyof Events\n ): this {\n if (eventName) {\n this.events.delete(eventName)\n } else {\n this.events.clear()\n }\n\n return this\n }\n\n public listeners(eventName: InternalEventNames): Array<Listener<any>>\n public listeners<EventName extends keyof Events>(\n eventName: EventName\n ): Array<Listener<Events[EventName]>>\n /**\n * Returns a copy of the array of listeners for the event named `eventName`.\n */\n public listeners(eventName: InternalEventNames | keyof Events) {\n return Array.from(this._getListeners(eventName))\n }\n\n public listenerCount(eventName: InternalEventNames): number\n public listenerCount<EventName extends keyof Events>(\n eventName: EventName\n ): number\n /**\n * Returns the number of listeners listening to the event named `eventName`.\n */\n public listenerCount(eventName: InternalEventNames | keyof Events): number {\n return this._getListeners(eventName).length\n }\n\n public rawListeners<EventName extends keyof Events>(\n eventName: EventName\n ): Array<Listener<Events[EventName]>> {\n return this.listeners(eventName)\n 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