diff options
author | 2020-11-16 00:10:28 +0100 | |
---|---|---|
committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/webpack/lib/util/cachedMerge.js | |
download | website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.gz website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.tar.bz2 website_creator-e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d.zip |
api, login, auth
Diffstat (limited to 'node_modules/webpack/lib/util/cachedMerge.js')
-rw-r--r-- | node_modules/webpack/lib/util/cachedMerge.js | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/util/cachedMerge.js b/node_modules/webpack/lib/util/cachedMerge.js new file mode 100644 index 0000000..124f647 --- /dev/null +++ b/node_modules/webpack/lib/util/cachedMerge.js @@ -0,0 +1,35 @@ +/* + 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 Object.assign(first, second), stores the result in WeakMap and returns result + * cachedMerge({a: 1}, {a: 2}) + * {a: 2} + * // when same arguments passed, gets the result from WeakMap and returns it. + * cachedMerge({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 cachedMerge = (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 = Object.assign({}, first, second); + innerCache.set(second, newMerge); + return newMerge; +}; + +module.exports = cachedMerge; |