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denoland-deno/ext/node/polyfills/_fs/_fs_exists.ts
Bartek Iwańczuk 72fe9bb470
refactor: rename InternalModuleLoader to ExtModuleLoader, use ext: scheme for snapshotted modules (#18041)
This commit renames "deno_core::InternalModuleLoader" to
"ExtModuleLoader" and changes the specifiers used by the 
modules loaded from this loader to "ext:".

"internal:" scheme was really ambiguous and it's more characters than
"ext:", which should result in slightly smaller snapshot size.

Closes https://github.com/denoland/deno/issues/18020
2023-03-08 12:44:54 +01:00

40 lines
1.4 KiB
TypeScript

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { fromFileUrl } from "ext:deno_node/path.ts";
type ExistsCallback = (exists: boolean) => void;
/**
* TODO: Also accept 'path' parameter as a Node polyfill Buffer type once these
* are implemented. See https://github.com/denoland/deno/issues/3403
* Deprecated in node api
*/
export function exists(path: string | URL, callback: ExistsCallback) {
path = path instanceof URL ? fromFileUrl(path) : path;
Deno.lstat(path).then(() => callback(true), () => callback(false));
}
// The callback of fs.exists doesn't have standard callback signature.
// We need to provide special implementation for promisify.
// See https://github.com/nodejs/node/pull/13316
const kCustomPromisifiedSymbol = Symbol.for("nodejs.util.promisify.custom");
Object.defineProperty(exists, kCustomPromisifiedSymbol, {
value: (path: string | URL) => {
return new Promise((resolve) => {
exists(path, (exists) => resolve(exists));
});
},
});
/**
* TODO: Also accept 'path' parameter as a Node polyfill Buffer or URL type once these
* are implemented. See https://github.com/denoland/deno/issues/3403
*/
export function existsSync(path: string | URL): boolean {
path = path instanceof URL ? fromFileUrl(path) : path;
try {
Deno.lstatSync(path);
return true;
} catch (_err) {
return false;
}
}