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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 'fs';
import * as path from 'path';
import {sync as browserResolve} from 'browser-resolve';
import pnpResolver from 'jest-pnp-resolver';
import {Config} from '@jest/types';
import isBuiltinModule from './isBuiltinModule';
import nodeModulesPaths from './nodeModulesPaths';
import ModuleNotFoundError from './ModuleNotFoundError';
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 resolve = options.browser ? browserResolve : resolveSync;
return resolve(path, {
basedir: options.basedir,
defaultResolver,
extensions: options.extensions,
moduleDirectory: options.moduleDirectory,
paths: options.paths,
rootDir: options.rootDir,
});
}
export const clearDefaultResolverCache = () => {
checkedPaths.clear();
};
const REGEX_RELATIVE_IMPORT = /^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[\\\/])/;
function resolveSync(
target: Config.Path,
options: ResolverOptions,
): Config.Path {
const basedir = options.basedir;
const extensions = options.extensions || ['.js'];
const paths = options.paths || [];
if (REGEX_RELATIVE_IMPORT.test(target)) {
// resolve relative import
const resolveTarget = path.resolve(basedir, target);
const result = tryResolve(resolveTarget);
if (result) {
return result;
}
} else {
// otherwise search for node_modules
const dirs = nodeModulesPaths(basedir, {
moduleDirectory: options.moduleDirectory,
paths,
});
for (let i = 0; i < dirs.length; i++) {
const resolveTarget = path.join(dirs[i], target);
const result = tryResolve(resolveTarget);
if (result) {
return result;
}
}
}
if (isBuiltinModule(target)) {
return target;
}
throw new ModuleNotFoundError(
"Cannot find module '" + target + "' from '" + basedir + "'",
);
/*
* contextual helper functions
*/
function tryResolve(name: Config.Path): Config.Path | undefined {
const dir = path.dirname(name);
let result;
if (isDirectory(dir)) {
result = resolveAsFile(name) || resolveAsDirectory(name);
}
if (result) {
// Dereference symlinks to ensure we don't create a separate
// module instance depending on how it was referenced.
result = fs.realpathSync(result);
}
return result;
}
function resolveAsFile(name: Config.Path): Config.Path | undefined {
if (isFile(name)) {
return name;
}
for (let i = 0; i < extensions.length; i++) {
const file = name + extensions[i];
if (isFile(file)) {
return file;
}
}
return undefined;
}
function resolveAsDirectory(name: Config.Path): Config.Path | undefined {
if (!isDirectory(name)) {
return undefined;
}
const pkgfile = path.join(name, 'package.json');
let pkgmain;
try {
const body = fs.readFileSync(pkgfile, 'utf8');
pkgmain = JSON.parse(body).main;
} catch (e) {}
if (pkgmain && !isCurrentDirectory(pkgmain)) {
const resolveTarget = path.resolve(name, pkgmain);
const result = tryResolve(resolveTarget);
if (result) {
return result;
}
}
return resolveAsFile(path.join(name, 'index'));
}
}
enum IPathType {
FILE = 1,
DIRECTORY = 2,
OTHER = 3,
}
const checkedPaths = new Map<string, IPathType>();
function statSyncCached(path: string): number {
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;
}
/*
* helper functions
*/
function isFile(file: Config.Path): boolean {
return statSyncCached(file) === IPathType.FILE;
}
function isDirectory(dir: Config.Path): boolean {
return statSyncCached(dir) === IPathType.DIRECTORY;
}
const CURRENT_DIRECTORY = path.resolve('.');
function isCurrentDirectory(testPath: Config.Path): boolean {
return CURRENT_DIRECTORY === path.resolve(testPath);
}