Remove file watching support from Jest.

Summary:Fixes #714, probably also #722 and also facebook/react-native#6019
Closes #724

Differential Revision: D2953708

fb-gh-sync-id: 110a30d6c11256644c8e4f7ab1d7b7cb5fa1b021
shipit-source-id: 110a30d6c11256644c8e4f7ab1d7b7cb5fa1b021

package.json

@@ -1,7 +1,7 @@
 {
   "name": "jest-cli",
   "description": "Painless JavaScript Unit Testing.",
-  "version": "0.9.0-fb1",
+  "version": "0.9.0-fb2",
   "main": "src/jest.js",
   "dependencies": {
     "chalk": "^1.1.1",
@@ -14,7 +14,7 @@
     "json-stable-stringify": "^1.0.0",
     "lodash.template": "^3.6.2",
     "mkdirp": "^0.5.1",
-    "node-haste": "^2.1.2",
+    "node-haste": "^2.2.0",
     "optimist": "^0.6.1",
     "resolve": "^1.1.6",
     "sane": "^1.2.0",

src/resolvers/HasteResolver.js

@@ -20,6 +20,14 @@ const path = require('path');
 
 const REQUIRE_EXTENSIONS_PATTERN = /(\b(?:require\s*?\.\s*?(?:requireActual|requireMock)|jest\s*?\.\s*?genMockFromModule)\s*?\(\s*?)(['"])([^'"]+)(\2\s*?\))/g;
 
+const createWatcher = config => {
+  if (config.watchman && FileWatcher.canUseWatchman()) {
+    return new FileWatcher(config.testPathDirs.map(dir => ({dir})));
+  }
+
+  return FileWatcher.createDummyWatcher();
+};
+
 class HasteResolver {
 
   constructor(config, options) {
@@ -39,12 +47,7 @@ class HasteResolver {
       cacheKey: getCacheKey('jest-haste-map', config),
     });
 
-    this._fileWatcher = new FileWatcher(
-      config.testPathDirs.map(dir => ({dir})),
-      {
-        useWatchman: config.watchman,
-      }
-    );
+    this._fileWatcher = createWatcher(config);
 
     this._mappedModuleNames = Object.create(null);
     if (config.moduleNameMapper.length) {