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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-18 23:26:45 +0100
commit81ddf9b700bc48a1f8e472209f080f9c1d9a9b09 (patch)
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parent1870f3fdf43707a15fda0f609a021f516f45eb63 (diff)
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-rw-r--r--node_modules/webpack/lib/util/cleverMerge.js77
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diff --git a/node_modules/webpack/lib/util/cleverMerge.js b/node_modules/webpack/lib/util/cleverMerge.js
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-/*
- MIT License http://www.opensource.org/licenses/mit-license.php
- Author Tobias Koppers @sokra
-*/
-
-"use strict";
-
-const mergeCache = new WeakMap();
-
-/**
- * Merges two given objects and caches the result to avoid computation if same objects passed as arguments again.
- * @example
- * // performs cleverMerge(first, second), stores the result in WeakMap and returns result
- * cachedCleverMerge({a: 1}, {a: 2})
- * {a: 2}
- * // when same arguments passed, gets the result from WeakMap and returns it.
- * cachedCleverMerge({a: 1}, {a: 2})
- * {a: 2}
- * @param {object} first first object
- * @param {object} second second object
- * @returns {object} merged object of first and second object
- */
-const cachedCleverMerge = (first, second) => {
- let innerCache = mergeCache.get(first);
- if (innerCache === undefined) {
- innerCache = new WeakMap();
- mergeCache.set(first, innerCache);
- }
- const prevMerge = innerCache.get(second);
- if (prevMerge !== undefined) return prevMerge;
- const newMerge = cleverMerge(first, second);
- innerCache.set(second, newMerge);
- return newMerge;
-};
-
-/**
- * Merges two objects. Objects are not deeply merged.
- * TODO webpack 5: merge objects deeply clever.
- * Arrays might reference the old value with "..."
- * @param {object} first first object
- * @param {object} second second object
- * @returns {object} merged object of first and second object
- */
-const cleverMerge = (first, second) => {
- const newObject = Object.assign({}, first);
- for (const key of Object.keys(second)) {
- if (!(key in newObject)) {
- newObject[key] = second[key];
- continue;
- }
- const secondValue = second[key];
- if (!Array.isArray(secondValue)) {
- newObject[key] = secondValue;
- continue;
- }
- const firstValue = newObject[key];
- if (Array.isArray(firstValue)) {
- const newArray = [];
- for (const item of secondValue) {
- if (item === "...") {
- for (const item of firstValue) {
- newArray.push(item);
- }
- } else {
- newArray.push(item);
- }
- }
- newObject[key] = newArray;
- } else {
- newObject[key] = secondValue;
- }
- }
- return newObject;
-};
-
-exports.cachedCleverMerge = cachedCleverMerge;
-exports.cleverMerge = cleverMerge;