69ee8fd96a
* Add commercial licence and update config files
* Update license in headers
* Revert "Update license in headers"
This reverts commit 7ed7949485.
* Update only spdx id
* Remove LicenseRef- from package.json
LicenseRef- no longer allowed in npm v3 package.json
This fixes the warning in the logs and failing build check.
50 lines
1.5 KiB
TypeScript
50 lines
1.5 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2020 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE files in the repository root for full details.
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*/
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import { arrayDiff, arrayIntersection } from "./arrays";
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/**
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* Determines the keys added, changed, and removed between two Maps.
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* For changes, simple triple equal comparisons are done, not in-depth tree checking.
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* @param a The first Map. Must be defined.
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* @param b The second Map. Must be defined.
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* @returns The difference between the keys of each Map.
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*/
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export function mapDiff<K, V>(a: Map<K, V>, b: Map<K, V>): { changed: K[]; added: K[]; removed: K[] } {
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const aKeys = [...a.keys()];
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const bKeys = [...b.keys()];
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const keyDiff = arrayDiff(aKeys, bKeys);
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const possibleChanges = arrayIntersection(aKeys, bKeys);
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const changes = possibleChanges.filter((k) => a.get(k) !== b.get(k));
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return { changed: changes, added: keyDiff.added, removed: keyDiff.removed };
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}
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/**
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* A Map<K, V> with added utility.
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*/
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export class EnhancedMap<K, V> extends Map<K, V> {
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public constructor(entries?: Iterable<[K, V]>) {
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super(entries);
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}
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public getOrCreate(key: K, def: V): V {
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if (this.has(key)) {
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return this.get(key)!;
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}
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this.set(key, def);
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return def;
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}
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public remove(key: K): V | undefined {
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const v = this.get(key);
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this.delete(key);
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return v;
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}
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}
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