fix: stop search if files names are undefined

CHANGELOG.md

@@ -13,6 +13,7 @@
 - `[jest-each]` Prevent done callback being supplied to describe ([#6843](https://github.com/facebook/jest/pull/6843))
 - `[jest-config]` Better error message for a case when a preset module was found, but no `jest-preset.js` or `jest-preset.json` at the root ([#6863](https://github.com/facebook/jest/pull/6863))
 - `[jest-mock]` Fix inheritance of static properties and methods in mocks ([#6921](https://github.com/facebook/jest/pull/6921))
+- `[jest-haste-map]` Catch crawler error when unsuccessfully reading directories ([#6761](https://github.com/facebook/jest/pull/6761))
 
 ### Chore & Maintenance
 

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

@@ -59,6 +59,8 @@ jest.mock('fs', () => {
         setTimeout(() => callback(null, ['directory', 'tomato.js']), 0);
       } else if (dir === '/fruits/directory') {
         setTimeout(() => callback(null, ['strawberry.js']), 0);
+      } else if (dir == '/error') {
+        setTimeout(() => callback({code: 'ENOTDIR'}, undefined), 0);
       }
     }),
     stat: jest.fn(stat),
@@ -217,4 +219,20 @@ describe('node crawler', () => {
       expect(data.files).toEqual({});
     });
   });
+
+  it('completes with fs.readdir throwing an error', () => {
+    process.platform = 'win32';
+
+    nodeCrawl = require('../node');
+
+    const files = Object.create(null);
+    return nodeCrawl({
+      data: {files},
+      extensions: ['js'],
+      ignore: pearMatcher,
+      roots: ['/error'],
+    }).then(data => {
+      expect(data.files).toEqual({});
+    });
+  });
 });

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

@@ -30,7 +30,10 @@ function find(
     activeCalls++;
     fs.readdir(directory, (err, names) => {
       activeCalls--;
-
+      if (err) {
+        callback(result);
+        return;
+      }
       names.forEach(file => {
         file = path.join(directory, file);
         if (ignore(file)) {