feat: use resolve package in jest-resolve

CHANGELOG.md

@@ -16,9 +16,10 @@
 
 ### Chore & Maintenance
 
+- `[docs]` Warn about unexpected behavior / bug of node-notifier when using the `notify` options.
+- `[jest-resolver]` Use `resolve` package to implement custom module resolution ([#9520](https://github.com/facebook/jest/pull/9520))
 - `[@jest/reporters]` Remove unused dependencies and type exports ([#9462](https://github.com/facebook/jest/pull/9462))
 - `[website]` Update pictures of reports when matchers fail ([#9214](https://github.com/facebook/jest/pull/9214))
-- `[docs]` Warn about unexpected behavior / bug of node-notifier when using the `notify` options.
 
 ### Performance
 

packages/jest-resolve/package.json

@@ -14,10 +14,12 @@
     "browser-resolve": "^1.11.3",
     "chalk": "^3.0.0",
     "jest-pnp-resolver": "^1.2.1",
-    "realpath-native": "^2.0.0"
+    "realpath-native": "^2.0.0",
+    "resolve": "^1.15.0"
   },
   "devDependencies": {
     "@types/browser-resolve": "^0.0.5",
+    "@types/resolve": "^1.14.0",
     "jest-haste-map": "^25.1.0"
   },
   "engines": {

packages/jest-resolve/src/__mocks__/userResolver.js

@@ -3,7 +3,6 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
  */
 
 'use strict';

packages/jest-resolve/src/__tests__/resolve.test.ts

@@ -9,7 +9,7 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import {ModuleMap} from 'jest-haste-map';
-import Resolver from '../';
+import Resolver = require('../');
 // @ts-ignore: js file
 import userResolver from '../__mocks__/userResolver';
 import nodeModulesPaths from '../nodeModulesPaths';
@@ -83,7 +83,7 @@ describe('findNodeModule', () => {
 });
 
 describe('resolveModule', () => {
-  let moduleMap: typeof ModuleMap;
+  let moduleMap: ModuleMap;
   beforeEach(() => {
     moduleMap = ModuleMap.create('/');
   });
@@ -195,7 +195,7 @@ describe('nodeModulesPaths', () => {
 
 describe('Resolver.getModulePaths() -> nodeModulesPaths()', () => {
   const _path = path;
-  let moduleMap: typeof ModuleMap;
+  let moduleMap: ModuleMap;
 
   beforeEach(() => {
     jest.resetModules();

packages/jest-resolve/src/defaultResolver.ts

@@ -6,14 +6,11 @@
  */
 
 import * as fs from 'fs';
-import * as path from 'path';
+import {sync as resolveSync} from 'resolve';
 import {sync as browserResolve} from 'browser-resolve';
 import {sync as realpath} from 'realpath-native';
 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;
@@ -36,120 +33,33 @@ export default function defaultResolver(
 
   const resolve = options.browser ? browserResolve : resolveSync;
 
-  let result = resolve(path, {
+  const result = resolve(path, {
     basedir: options.basedir,
-    defaultResolver,
     extensions: options.extensions,
+    isDirectory,
+    isFile,
     moduleDirectory: options.moduleDirectory,
     paths: options.paths,
-    rootDir: options.rootDir,
+    preserveSymlinks: false,
   });
-  if (options.browser && result) {
+
+  try {
     // Dereference symlinks to ensure we don't create a separate
     // module instance depending on how it was referenced.
-    result = realpath(result);
-  }
-  return result;
-}
+    const resolved = realpath(result);
 
-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 (resolved) {
+      return resolved;
     }
+  } catch {
+    // ignore
   }
 
-  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 = realpath(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 result;
+}
 
-    return resolveAsFile(path.join(name, 'index'));
-  }
+export function clearDefaultResolverCache() {
+  checkedPaths.clear();
 }
 
 enum IPathType {
@@ -197,8 +107,3 @@ function isFile(file: Config.Path): boolean {
 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);
-}

yarn.lock

@@ -2297,7 +2297,7 @@
     "@types/prop-types" "*"
     csstype "^2.2.0"
 
-"@types/resolve@*":
+"@types/resolve@*", "@types/resolve@^1.14.0":
   version "1.14.0"
   resolved "https://registry.yarnpkg.com/@types/resolve/-/resolve-1.14.0.tgz#c95d696264f8e53e764a7c0b83e9317b458b76c3"
   integrity sha512-bmjNBW6tok+67iOsASeYSJxSgY++BIR35nGyGLORTDirhra9reJ0shgGL3U7KPDUbOBCx8JrlCjd4d/y5uiMRQ==