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/**
* @fileoverview Applies default rule options
* @author JoshuaKGoldberg
*/
/**
* Check if the variable contains an object strictly rejecting arrays
* @param {unknown} value an object
* @returns {boolean} Whether value is an object
*/
function isObjectNotArray(value) {
return typeof value === "object" && value !== null && !Array.isArray(value);
}
/**
* Deeply merges second on top of first, creating a new {} object if needed.
* @param {T} first Base, default value.
* @param {U} second User-specified value.
* @returns {T | U | (T & U)} Merged equivalent of second on top of first.
*/
function deepMergeObjects(first, second) {
if (second === void 0) {
return first;
}
if (!isObjectNotArray(first) || !isObjectNotArray(second)) {
return second;
}
const result = { ...first, ...second };
for (const key of Object.keys(second)) {
if (Object.prototype.propertyIsEnumerable.call(first, key)) {
result[key] = deepMergeObjects(first[key], second[key]);
}
}
return result;
}
/**
* Deeply merges second on top of first, creating a new [] array if needed.
* @param {T[] | undefined} first Base, default values.
* @param {U[] | undefined} second User-specified values.
* @returns {(T | U | (T & U))[]} Merged equivalent of second on top of first.
*/
function deepMergeArrays(first, second) {
if (!first || !second) {
return second || first || [];
}
return [
...first.map((value, i) => deepMergeObjects(value, second[i])),
...second.slice(first.length)
];
}
export { deepMergeArrays };
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