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defaultResolver.ts
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defaultResolver.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import * as fs from 'graceful-fs';
import {sync as resolveSync} from 'resolve';
import pnpResolver from 'jest-pnp-resolver';
import {tryRealpath} from 'jest-util';
import type {Config} from '@jest/types';
type ResolverOptions = {
basedir: Config.Path;
browser?: boolean;
defaultResolver: typeof defaultResolver;
extensions?: Array<string>;
moduleDirectory?: Array<string>;
paths?: Array<Config.Path>;
rootDir?: Config.Path;
};
export default function defaultResolver(
path: Config.Path,
options: ResolverOptions,
): Config.Path {
// @ts-ignore: the "pnp" version named isn't in DefinitelyTyped
if (process.versions.pnp) {
return pnpResolver(path, options);
}
const result = resolveSync(path, {
basedir: options.basedir,
extensions: options.extensions,
isDirectory,
isFile,
moduleDirectory: options.moduleDirectory,
paths: options.paths,
preserveSymlinks: false,
// @ts-ignore: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/44137
realpathSync,
});
// Dereference symlinks to ensure we don't create a separate
// module instance depending on how it was referenced.
return realpathSync(result);
}
export function clearDefaultResolverCache(): void {
checkedPaths.clear();
checkedRealpathPaths.clear();
}
enum IPathType {
FILE = 1,
DIRECTORY = 2,
OTHER = 3,
}
const checkedPaths = new Map<string, IPathType>();
function statSyncCached(path: string): IPathType {
const result = checkedPaths.get(path);
if (result !== undefined) {
return result;
}
let stat;
try {
stat = fs.statSync(path);
} catch (e) {
if (!(e && (e.code === 'ENOENT' || e.code === 'ENOTDIR'))) {
throw e;
}
}
if (stat) {
if (stat.isFile() || stat.isFIFO()) {
checkedPaths.set(path, IPathType.FILE);
return IPathType.FILE;
} else if (stat.isDirectory()) {
checkedPaths.set(path, IPathType.DIRECTORY);
return IPathType.DIRECTORY;
}
}
checkedPaths.set(path, IPathType.OTHER);
return IPathType.OTHER;
}
const checkedRealpathPaths = new Map<string, string>();
function realpathCached(path: Config.Path): Config.Path {
let result = checkedRealpathPaths.get(path);
if (result !== undefined) {
return result;
}
result = tryRealpath(path);
checkedRealpathPaths.set(path, result);
if (path !== result) {
// also cache the result in case it's ever referenced directly - no reason to `realpath` that as well
checkedRealpathPaths.set(result, result);
}
return result;
}
/*
* helper functions
*/
function isFile(file: Config.Path): boolean {
return statSyncCached(file) === IPathType.FILE;
}
function isDirectory(dir: Config.Path): boolean {
return statSyncCached(dir) === IPathType.DIRECTORY;
}
function realpathSync(file: Config.Path): Config.Path {
return realpathCached(file);
}