53 lines
1.5 KiB
TypeScript
53 lines
1.5 KiB
TypeScript
// Copyright 2023 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import Fuse from 'fuse.js';
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import { removeDiacritics } from './removeDiacritics.js';
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const cachedIndices: Map<
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Fuse.IFuseOptions<unknown>,
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WeakMap<ReadonlyArray<unknown>, Fuse<unknown>>
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> = new Map();
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export function getCachedFuseIndex<T>(
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list: ReadonlyArray<T>,
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options: Fuse.IFuseOptions<T>
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): Fuse<T> {
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// Helper to retrieve a cached fuse index or create one if needed. Indices are uniquely
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// identified by their `options` and the `list` of values being indexed. Both should
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// remain referentially static in order to avoid unnecessarily re-indexing
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let indicesForOptions = cachedIndices.get(
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options as Fuse.IFuseOptions<unknown>
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);
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if (!indicesForOptions) {
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indicesForOptions = new WeakMap();
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cachedIndices.set(options as Fuse.IFuseOptions<unknown>, indicesForOptions);
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}
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let index = indicesForOptions.get(list);
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if (!index) {
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index = new Fuse<T>(list, options);
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indicesForOptions.set(list, index);
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}
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// Map's types don't allow us to specify that the type of the value depends on the
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// type of the key, so we have to cast it here.
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return index as unknown as Fuse<T>;
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}
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export const fuseGetFnRemoveDiacritics: Fuse.FuseGetFunction<unknown> = (
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...args
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) => {
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const text = Fuse.config.getFn(...args);
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if (!text) {
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return text;
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}
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if (typeof text === 'string') {
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return removeDiacritics(text);
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}
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return text.map(removeDiacritics);
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};
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