fix: crash on unix based systems without find (#9579)

CHANGELOG.md

@@ -17,6 +17,7 @@
 - `[jest-cli]` Set `coverageProvider` correctly when provided in config ([#9562](https://github.com/facebook/jest/pull/9562))
 - `[jest-cli]` Allow specifying `.cjs` and `.mjs` config files by `--config` CLI option ([#9578](https://github.com/facebook/jest/pull/9578))
 - `[jest-config]` Ensure pattern of `replacePosixSep` is a string ([#9546]https://github.com/facebook/jest/pull/9546)
+- `[jest-haste-map]` Fix crash on unix based systems without find ([#9579](https://github.com/facebook/jest/pull/9579))
 - `[jest-matcher-utils]` Fix diff highlight of symbol-keyed object. ([#9499](https://github.com/facebook/jest/pull/9499))
 - `[@jest/reporters]` Notifications should be fire&forget rather than having a timeout ([#9567](https://github.com/facebook/jest/pull/9567))
 - `[jest-resolve]` Fix module identity preservation with symlinks and browser field resolution ([#9511](https://github.com/facebook/jest/pull/9511))

packages/jest-haste-map/package.json

@@ -19,7 +19,8 @@
     "jest-worker": "^25.1.0",
     "micromatch": "^4.0.2",
     "sane": "^4.0.3",
-    "walker": "^1.0.7"
+    "walker": "^1.0.7",
+    "which": "^2.0.2"
   },
   "devDependencies": {
     "@jest/test-utils": "^25.1.0",
@@ -28,7 +29,8 @@
     "@types/graceful-fs": "^4.1.2",
     "@types/micromatch": "^4.0.0",
     "@types/node": "*",
-    "@types/sane": "^2.0.0"
+    "@types/sane": "^2.0.0",
+    "@types/which": "^1.3.2"
   },
   "optionalDependencies": {
     "fsevents": "^2.1.2"

packages/jest-haste-map/src/crawlers/__tests__/node.test.js

@@ -124,6 +124,8 @@ jest.mock('fs', () => {
   };
 });
 
+jest.mock('which', () => jest.fn().mockResolvedValue());
+
 const pearMatcher = path => /pear/.test(path);
 const createMap = obj => new Map(Object.keys(obj).map(key => [key, obj[key]]));
 
@@ -291,6 +293,33 @@ describe('node crawler', () => {
     });
   });
 
+  it('uses node fs APIs on Unix based OS without find binary', () => {
+    process.platform = 'linux';
+    const which = require('which');
+    which.mockReturnValueOnce(Promise.reject());
+
+    nodeCrawl = require('../node');
+
+    return nodeCrawl({
+      data: {
+        files: new Map(),
+      },
+      extensions: ['js'],
+      ignore: pearMatcher,
+      rootDir,
+      roots: ['/project/fruits'],
+    }).then(({hasteMap, removedFiles}) => {
+      expect(hasteMap.files).toEqual(
+        createMap({
+          'fruits/directory/strawberry.js': ['', 33, 42, 0, '', null],
+          'fruits/tomato.js': ['', 32, 42, 0, '', null],
+        }),
+      );
+      expect(removedFiles).toEqual(new Map());
+      expect(which).toBeCalledWith('find');
+    });
+  });
+
   it('uses node fs APIs if "forceNodeFilesystemAPI" is set to true, regardless of platform', () => {
     process.platform = 'linux';
 

packages/jest-haste-map/src/crawlers/node.ts

@@ -8,6 +8,7 @@
 import * as fs from 'fs';
 import * as path from 'path';
 import {spawn} from 'child_process';
+import which = require('which');
 import H from '../constants';
 import * as fastPath from '../lib/fast_path';
 import {
@@ -21,6 +22,21 @@ type Result = Array<[/* id */ string, /* mtime */ number, /* size */ number]>;
 
 type Callback = (result: Result) => void;
 
+async function hasNativeFindSupport(
+  forceNodeFilesystemAPI: boolean,
+): Promise<boolean> {
+  if (forceNodeFilesystemAPI || process.platform === 'win32') {
+    return false;
+  }
+
+  try {
+    await which('find');
+    return true;
+  } catch {
+    return false;
+  }
+}
+
 function find(
   roots: Array<string>,
   extensions: Array<string>,
@@ -154,7 +170,7 @@ function findNative(
   });
 }
 
-export = function nodeCrawl(
+export = async function nodeCrawl(
   options: CrawlerOptions,
 ): Promise<{
   removedFiles: FileData;
@@ -169,6 +185,8 @@ export = function nodeCrawl(
     roots,
   } = options;
 
+  const useNativeFind = await hasNativeFindSupport(forceNodeFilesystemAPI);
+
   return new Promise(resolve => {
     const callback = (list: Result) => {
       const files = new Map();
@@ -193,10 +211,10 @@ export = function nodeCrawl(
       });
     };
 
-    if (forceNodeFilesystemAPI || process.platform === 'win32') {
-      find(roots, extensions, ignore, callback);
-    } else {
+    if (useNativeFind) {
       findNative(roots, extensions, ignore, callback);
+    } else {
+      find(roots, extensions, ignore, callback);
     }
   });
 };

yarn.lock

@@ -14745,7 +14745,7 @@ which@1.3.1, which@^1.2.1, which@^1.2.9, which@^1.3.0, which@^1.3.1:
   dependencies:
     isexe "^2.0.0"
 
-which@^2.0.1:
+which@^2.0.1, which@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/which/-/which-2.0.2.tgz#7c6a8dd0a636a0327e10b59c9286eee93f3f51b1"
   integrity sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==