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Use `access` on *nix and `GetFileAttributesW` on Windows. [Benchmark](https://paste.divy.work/p/-gq8Ark.js): ``` $ deno run -A bench.mjs # main (568dd) existsSync: 8980.636629ms $ target/release/deno run -A bench.mjs # this PR existsSync: 6448.7604519999995ms $ bun bench.mjs existsSync: 6562.88671ms $ node bench.mjs existsSync: 7740.064653ms ``` Ref https://github.com/denoland/deno/pull/24434#discussion_r1679777912
41 lines
1.5 KiB
TypeScript
41 lines
1.5 KiB
TypeScript
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
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// TODO(petamoriken): enable prefer-primordials for node polyfills
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// deno-lint-ignore-file prefer-primordials
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import { op_node_fs_exists, op_node_fs_exists_sync } from "ext:core/ops";
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import { pathFromURL } from "ext:deno_web/00_infra.js";
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type ExistsCallback = (exists: boolean) => void;
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/**
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* TODO: Also accept 'path' parameter as a Node polyfill Buffer type once these
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* are implemented. See https://github.com/denoland/deno/issues/3403
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* Deprecated in node api
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*/
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export function exists(path: string | URL, callback: ExistsCallback) {
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path = path instanceof URL ? pathFromURL(path) : path;
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op_node_fs_exists(path).then(callback);
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}
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// The callback of fs.exists doesn't have standard callback signature.
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// We need to provide special implementation for promisify.
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// See https://github.com/nodejs/node/pull/13316
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const kCustomPromisifiedSymbol = Symbol.for("nodejs.util.promisify.custom");
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Object.defineProperty(exists, kCustomPromisifiedSymbol, {
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value: (path: string | URL) => {
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return new Promise((resolve) => {
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exists(path, (exists) => resolve(exists));
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});
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},
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});
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/**
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* TODO: Also accept 'path' parameter as a Node polyfill Buffer or URL type once these
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* are implemented. See https://github.com/denoland/deno/issues/3403
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*/
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export function existsSync(path: string | URL): boolean {
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path = path instanceof URL ? pathFromURL(path) : path;
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return op_node_fs_exists_sync(path);
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}
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