Improve performance of node-haste2 and react-packager

Reviewed By: davidaurelio

Differential Revision: D2911210

fb-gh-sync-id: 8ac2f213e8a9e089281bb065f9a7190d2e0f5b18
shipit-source-id: 8ac2f213e8a9e089281bb065f9a7190d2e0f5b18

npm-shrinkwrap.json

@@ -127,30 +127,30 @@
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           "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.8.12.tgz"
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-        },
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           "from": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz",
           "resolved": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz"
         },
+        "globals": {
+          "version": "6.4.1",
+          "from": "https://registry.npmjs.org/globals/-/globals-6.4.1.tgz",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-6.4.1.tgz"
+        },
         "js-tokens": {
           "version": "1.0.1",
           "from": "https://registry.npmjs.org/js-tokens/-/js-tokens-1.0.1.tgz",
           "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-1.0.1.tgz"
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-          "from": "https://registry.npmjs.org/recast/-/recast-0.10.33.tgz",
-          "resolved": "https://registry.npmjs.org/recast/-/recast-0.10.33.tgz"
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           "from": "https://registry.npmjs.org/regenerator/-/regenerator-0.8.40.tgz",
           "resolved": "https://registry.npmjs.org/regenerator/-/regenerator-0.8.40.tgz"
+        },
+        "recast": {
+          "version": "0.10.33",
+          "from": "https://registry.npmjs.org/recast/-/recast-0.10.33.tgz",
+          "resolved": "https://registry.npmjs.org/recast/-/recast-0.10.33.tgz"
         }
       }
     },
@@ -228,16 +228,16 @@
           "from": "https://registry.npmjs.org/ast-types/-/ast-types-0.8.12.tgz",
           "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.8.12.tgz"
         },
-        "babylon": {
-          "version": "5.8.29",
-          "from": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz",
-          "resolved": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz"
-        },
         "globals": {
           "version": "6.4.1",
           "from": "https://registry.npmjs.org/globals/-/globals-6.4.1.tgz",
           "resolved": "https://registry.npmjs.org/globals/-/globals-6.4.1.tgz"
         },
+        "babylon": {
+          "version": "5.8.29",
+          "from": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-5.8.29.tgz"
+        },
         "js-tokens": {
           "version": "1.0.1",
           "from": "https://registry.npmjs.org/js-tokens/-/js-tokens-1.0.1.tgz",
@@ -1814,6 +1814,11 @@
       "from": "https://registry.npmjs.org/fancy-log/-/fancy-log-1.1.0.tgz",
       "resolved": "https://registry.npmjs.org/fancy-log/-/fancy-log-1.1.0.tgz"
     },
+    "fast-path": {
+      "version": "1.1.0",
+      "from": "fast-path@*",
+      "resolved": "https://registry.npmjs.org/fast-path/-/fast-path-1.1.0.tgz"
+    },
     "fbjs": {
       "version": "0.6.0",
       "from": "https://registry.npmjs.org/fbjs/-/fbjs-0.6.0.tgz",
@@ -1890,76 +1895,71 @@
             }
           }
         },
-        "abbrev": {
-          "version": "1.0.7",
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-          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.7.tgz"
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         "ansi": {
           "version": "0.3.0",
           "from": "ansi@~0.3.0",
           "resolved": "https://registry.npmjs.org/ansi/-/ansi-0.3.0.tgz"
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-          "version": "2.0.0",
-          "from": "ansi-regex@^2.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
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           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.1.0.tgz"
         },
-        "are-we-there-yet": {
+        "abbrev": {
-          "version": "1.0.4",
+          "version": "1.0.7",
-          "from": "are-we-there-yet@~1.0.0",
+          "from": "abbrev@1",
-          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.0.4.tgz"
+          "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.7.tgz"
+        },
+        "ansi-regex": {
+          "version": "2.0.0",
+          "from": "ansi-regex@^2.0.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
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           "version": "0.1.11",
           "from": "asn1@0.1.11",
           "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.1.11.tgz"
         },
-        "assert-plus": {
+        "are-we-there-yet": {
-          "version": "0.1.5",
+          "version": "1.0.4",
-          "from": "assert-plus@^0.1.5",
+          "from": "are-we-there-yet@~1.0.0",
-          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz"
+          "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.0.4.tgz"
-        },
-        "async": {
-          "version": "1.5.0",
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-          "resolved": "https://registry.npmjs.org/async/-/async-1.5.0.tgz"
         },
         "aws-sign2": {
           "version": "0.6.0",
           "from": "aws-sign2@~0.6.0",
           "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz"
         },
+        "async": {
+          "version": "1.5.0",
+          "from": "async@^1.4.0",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.5.0.tgz"
+        },
+        "assert-plus": {
+          "version": "0.1.5",
+          "from": "assert-plus@^0.1.5",
+          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.1.5.tgz"
+        },
         "balanced-match": {
           "version": "0.2.1",
           "from": "balanced-match@>=0.2.0 <0.3.0",
           "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-0.2.1.tgz"
         },
-        "block-stream": {
-          "version": "0.0.8",
-          "from": "block-stream@*",
-          "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.8.tgz"
-        },
         "boom": {
           "version": "2.10.1",
           "from": "boom@^2.8.x",
           "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz"
         },
+        "block-stream": {
+          "version": "0.0.8",
+          "from": "block-stream@*",
+          "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.8.tgz"
+        },
         "brace-expansion": {
           "version": "1.1.1",
           "from": "brace-expansion@>=1.0.0 <2.0.0",
           "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.1.tgz"
         },
-        "caseless": {
-          "version": "0.11.0",
-          "from": "caseless@~0.11.0",
-          "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz"
-        },
         "chalk": {
           "version": "1.1.1",
           "from": "chalk@^1.1.1",
@@ -1970,21 +1970,26 @@
           "from": "combined-stream@~1.0.5",
           "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz"
         },
+        "caseless": {
+          "version": "0.11.0",
+          "from": "caseless@~0.11.0",
+          "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.11.0.tgz"
+        },
         "commander": {
           "version": "2.9.0",
           "from": "commander@^2.8.1",
           "resolved": "https://registry.npmjs.org/commander/-/commander-2.9.0.tgz"
         },
-        "concat-map": {
-          "version": "0.0.1",
-          "from": "concat-map@0.0.1",
-          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz"
-        },
         "core-util-is": {
           "version": "1.0.1",
           "from": "core-util-is@~1.0.0",
           "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.1.tgz"
         },
+        "concat-map": {
+          "version": "0.0.1",
+          "from": "concat-map@0.0.1",
+          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz"
+        },
         "cryptiles": {
           "version": "2.0.5",
           "from": "cryptiles@2.x.x",
@@ -1995,16 +2000,16 @@
           "from": "ctype@0.5.3",
           "resolved": "https://registry.npmjs.org/ctype/-/ctype-0.5.3.tgz"
         },
-        "debug": {
-          "version": "0.7.4",
-          "from": "debug@~0.7.2",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-0.7.4.tgz"
-        },
         "deep-extend": {
           "version": "0.2.11",
           "from": "deep-extend@~0.2.5",
           "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.2.11.tgz"
         },
+        "debug": {
+          "version": "0.7.4",
+          "from": "debug@~0.7.2",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-0.7.4.tgz"
+        },
         "delayed-stream": {
           "version": "1.0.0",
           "from": "delayed-stream@~1.0.0",
@@ -2055,16 +2060,16 @@
           "from": "generate-object-property@^1.1.0",
           "resolved": "https://registry.npmjs.org/generate-object-property/-/generate-object-property-1.2.0.tgz"
         },
-        "graceful-fs": {
-          "version": "4.1.2",
-          "from": "graceful-fs@4.1",
-          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.2.tgz"
-        },
         "graceful-readlink": {
           "version": "1.0.1",
           "from": "graceful-readlink@>= 1.0.0",
           "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz"
         },
+        "graceful-fs": {
+          "version": "4.1.2",
+          "from": "graceful-fs@4.1",
+          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.2.tgz"
+        },
         "har-validator": {
           "version": "2.0.2",
           "from": "har-validator@~2.0.2",
@@ -2110,11 +2115,6 @@
           "from": "is-my-json-valid@^2.12.2",
           "resolved": "https://registry.npmjs.org/is-my-json-valid/-/is-my-json-valid-2.12.2.tgz"
         },
-        "is-property": {
-          "version": "1.0.2",
-          "from": "is-property@^1.0.0",
-          "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz"
-        },
         "isarray": {
           "version": "0.0.1",
           "from": "isarray@0.0.1",
@@ -2125,21 +2125,26 @@
           "from": "isstream@~0.1.2",
           "resolved": "https://registry.npmjs.org/isstream/-/isstream-0.1.2.tgz"
         },
+        "is-property": {
+          "version": "1.0.2",
+          "from": "is-property@^1.0.0",
+          "resolved": "https://registry.npmjs.org/is-property/-/is-property-1.0.2.tgz"
+        },
         "json-stringify-safe": {
           "version": "5.0.1",
           "from": "json-stringify-safe@~5.0.1",
           "resolved": "https://registry.npmjs.org/json-stringify-safe/-/json-stringify-safe-5.0.1.tgz"
         },
-        "jsonpointer": {
-          "version": "2.0.0",
-          "from": "jsonpointer@2.0.0",
-          "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-2.0.0.tgz"
-        },
         "lodash._basetostring": {
           "version": "3.0.1",
           "from": "lodash._basetostring@^3.0.0",
           "resolved": "https://registry.npmjs.org/lodash._basetostring/-/lodash._basetostring-3.0.1.tgz"
         },
+        "jsonpointer": {
+          "version": "2.0.0",
+          "from": "jsonpointer@2.0.0",
+          "resolved": "https://registry.npmjs.org/jsonpointer/-/jsonpointer-2.0.0.tgz"
+        },
         "lodash._createpadding": {
           "version": "3.6.1",
           "from": "lodash._createpadding@^3.0.0",
@@ -2150,31 +2155,31 @@
           "from": "lodash.pad@^3.0.0",
           "resolved": "https://registry.npmjs.org/lodash.pad/-/lodash.pad-3.1.1.tgz"
         },
-        "lodash.padleft": {
-          "version": "3.1.1",
-          "from": "lodash.padleft@^3.0.0",
-          "resolved": "https://registry.npmjs.org/lodash.padleft/-/lodash.padleft-3.1.1.tgz"
-        },
         "lodash.padright": {
           "version": "3.1.1",
           "from": "lodash.padright@^3.0.0",
           "resolved": "https://registry.npmjs.org/lodash.padright/-/lodash.padright-3.1.1.tgz"
         },
+        "lodash.padleft": {
+          "version": "3.1.1",
+          "from": "lodash.padleft@^3.0.0",
+          "resolved": "https://registry.npmjs.org/lodash.padleft/-/lodash.padleft-3.1.1.tgz"
+        },
         "lodash.repeat": {
           "version": "3.0.1",
           "from": "lodash.repeat@^3.0.0",
           "resolved": "https://registry.npmjs.org/lodash.repeat/-/lodash.repeat-3.0.1.tgz"
         },
-        "mime-db": {
-          "version": "1.19.0",
-          "from": "mime-db@~1.19.0",
-          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.19.0.tgz"
-        },
         "mime-types": {
           "version": "2.1.7",
           "from": "mime-types@~2.1.7",
           "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.7.tgz"
         },
+        "mime-db": {
+          "version": "1.19.0",
+          "from": "mime-db@~1.19.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.19.0.tgz"
+        },
         "minimist": {
           "version": "0.0.8",
           "from": "minimist@0.0.8",
@@ -2195,21 +2200,26 @@
           "from": "npmlog@~1.2.0",
           "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-1.2.1.tgz"
         },
-        "oauth-sign": {
-          "version": "0.8.0",
-          "from": "oauth-sign@~0.8.0",
-          "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.0.tgz"
-        },
         "once": {
           "version": "1.1.1",
           "from": "once@~1.1.1",
           "resolved": "https://registry.npmjs.org/once/-/once-1.1.1.tgz"
         },
+        "oauth-sign": {
+          "version": "0.8.0",
+          "from": "oauth-sign@~0.8.0",
+          "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.0.tgz"
+        },
         "path-is-absolute": {
           "version": "1.0.0",
           "from": "path-is-absolute@>=1.0.0 <2.0.0",
           "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.0.tgz"
         },
+        "qs": {
+          "version": "5.2.0",
+          "from": "qs@~5.2.0",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-5.2.0.tgz"
+        },
         "pinkie": {
           "version": "1.0.0",
           "from": "pinkie@^1.0.0",
@@ -2220,11 +2230,6 @@
           "from": "pinkie-promise@^1.0.0",
           "resolved": "https://registry.npmjs.org/pinkie-promise/-/pinkie-promise-1.0.0.tgz"
         },
-        "qs": {
-          "version": "5.2.0",
-          "from": "qs@~5.2.0",
-          "resolved": "https://registry.npmjs.org/qs/-/qs-5.2.0.tgz"
-        },
         "readable-stream": {
           "version": "1.1.13",
           "from": "readable-stream@^1.1.13",
@@ -2235,16 +2240,16 @@
           "from": "request@2.x",
           "resolved": "https://registry.npmjs.org/request/-/request-2.65.0.tgz"
         },
-        "semver": {
-          "version": "5.0.3",
-          "from": "semver@~5.0.1",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.0.3.tgz"
-        },
         "sntp": {
           "version": "1.0.9",
           "from": "sntp@1.x.x",
           "resolved": "https://registry.npmjs.org/sntp/-/sntp-1.0.9.tgz"
         },
+        "semver": {
+          "version": "5.0.3",
+          "from": "semver@~5.0.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.0.3.tgz"
+        },
         "string_decoder": {
           "version": "0.10.31",
           "from": "string_decoder@~0.10.x",
@@ -2255,26 +2260,26 @@
           "from": "stringstream@~0.0.4",
           "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz"
         },
-        "strip-ansi": {
-          "version": "3.0.0",
-          "from": "strip-ansi@^3.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.0.tgz"
-        },
         "strip-json-comments": {
           "version": "0.1.3",
           "from": "strip-json-comments@0.1.x",
           "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-0.1.3.tgz"
         },
-        "supports-color": {
-          "version": "2.0.0",
-          "from": "supports-color@^2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
-        },
         "tar": {
           "version": "2.2.1",
           "from": "tar@~2.2.0",
           "resolved": "https://registry.npmjs.org/tar/-/tar-2.2.1.tgz"
         },
+        "strip-ansi": {
+          "version": "3.0.0",
+          "from": "strip-ansi@^3.0.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.0.tgz"
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "from": "supports-color@^2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz"
+        },
         "tough-cookie": {
           "version": "2.2.0",
           "from": "tough-cookie@~2.2.0",

package.json

@@ -75,7 +75,8 @@
     ],
     "unmockedModulePathPatterns": [
       "promise",
-      "source-map"
+      "source-map",
+      "fast-path"
     ]
   },
   "main": "Libraries/react-native/react-native.js",
@@ -122,6 +123,7 @@
     "connect": "^2.8.3",
     "debug": "^2.2.0",
     "event-target-shim": "^1.0.5",
+    "fast-path": "^1.1.0",
     "fbjs": "^0.6.0",
     "fbjs-scripts": "^0.4.0",
     "graceful-fs": "^4.1.2",

packager/react-packager/index.js

@@ -10,6 +10,7 @@
 
 require('../babelRegisterOnly')([/react-packager\/src/]);
 
+require('fast-path').replace();
 useGracefulFs();
 
 var debug = require('debug');

packager/react-packager/src/DependencyResolver/Cache/index.js

@@ -51,11 +51,9 @@ class Cache {
       throw new Error('Use absolute paths');
     }
 
-    var recordP = this.has(filepath, field)
+    return this.has(filepath, field)
       ? this._data[filepath].data[field]
       : this.set(filepath, field, loaderCb(filepath));
-
-    return recordP.then(record => record);
   }
 
   invalidate(filepath, field) {

packager/react-packager/src/DependencyResolver/Cache/lib/getCacheFilePath.js

@@ -9,7 +9,7 @@
 'use strict';
 
 const crypto = require('crypto');
-const path = require('path');
+const path = require('fast-path');
 
 function getCacheFilePath(tmpdir, ...args) {
   const hash = crypto.createHash('md5');

packager/react-packager/src/DependencyResolver/DependencyGraph/DependencyGraphHelpers.js

@@ -8,7 +8,7 @@
  */
 'use strict';
 
-const path = require('path');
+const path = require('fast-path');
 
 class DependencyGraphHelpers {
   constructor({ providesModuleNodeModules, assetExts }) {
@@ -17,17 +17,13 @@ class DependencyGraphHelpers {
   }
 
   isNodeModulesDir(file) {
-    let parts = path.normalize(file).split(path.sep);
+    const index = file.lastIndexOf('/node_modules/');
-    const indexOfNodeModules = parts.lastIndexOf('node_modules');
+    if (index === -1) {
-
-    if (indexOfNodeModules === -1) {
       return false;
     }
 
-    parts = parts.slice(indexOfNodeModules + 1);
+    const parts = file.substr(index + 14).split(path.sep);
-
     const dirs = this._providesModuleNodeModules;
-
     for (let i = 0; i < dirs.length; i++) {
       if (parts.indexOf(dirs[i]) > -1) {
         return false;
@@ -42,7 +38,7 @@ class DependencyGraphHelpers {
   }
 
   extname(name) {
-    return path.extname(name).replace(/^\./, '');
+    return path.extname(name).substr(1);
   }
 }
 

packager/react-packager/src/DependencyResolver/DependencyGraph/DeprecatedAssetMap.js

@@ -11,7 +11,7 @@
 const AssetModule_DEPRECATED = require('../AssetModule_DEPRECATED');
 const Fastfs = require('../fastfs');
 const debug = require('debug')('ReactNativePackager:DependencyGraph');
-const path = require('path');
+const path = require('fast-path');
 const Promise = require('promise');
 
 class DeprecatedAssetMap {
@@ -23,8 +23,9 @@ class DeprecatedAssetMap {
     ignoreFilePath,
     helpers,
     activity,
+    enabled,
   }) {
-    if (roots == null || roots.length === 0) {
+    if (roots == null || roots.length === 0 || !enabled) {
       this._disabled = true;
       return;
     }
@@ -32,16 +33,19 @@ class DeprecatedAssetMap {
     this._helpers = helpers;
     this._map = Object.create(null);
     this._assetExts = assetExts;
+    this._activity = activity;
+
+    if (!this._disabled) {
       this._fastfs = new Fastfs(
         'Assets',
         roots,
         fileWatcher,
         { ignore: ignoreFilePath, crawling: fsCrawl, activity }
       );
-    this._activity = activity;
 
       this._fastfs.on('change', this._processFileChange.bind(this));
     }
+  }
 
   build() {
     if (this._disabled) {
@@ -89,7 +93,7 @@ class DeprecatedAssetMap {
     if (this._assetExts.indexOf(ext) !== -1) {
       const name = assetName(file, ext);
       if (this._map[name] != null) {
-        debug('Conflcting assets', name);
+        debug('Conflicting assets', name);
       }
 
       this._map[name] = new AssetModule_DEPRECATED({ file });

packager/react-packager/src/DependencyResolver/DependencyGraph/HasteMap.js

@@ -7,7 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 'use strict';
-const path = require('path');
+const path = require('fast-path');
 const getPlatformExtension = require('../lib/getPlatformExtension');
 const Promise = require('promise');
 
@@ -31,18 +31,18 @@ class HasteMap {
 
   build() {
     this._map = Object.create(null);
-
+    const promises = [];
-    let promises = this._fastfs.findFilesByExts(this._extensions, {
+    this._fastfs.getAllFiles().forEach(filePath => {
-      ignore: (file) => this._helpers.isNodeModulesDir(file),
+      if (!this._helpers.isNodeModulesDir(filePath)) {
-    }).map(file => this._processHasteModule(file));
+        if (this._extensions.indexOf(path.extname(filePath).substr(1)) !== -1) {
-
+          promises.push(this._processHasteModule(filePath));
-    promises = promises.concat(
+        }
-      this._fastfs.findFilesByName('package.json', {
+        if (filePath.endsWith('/package.json')) {
-        ignore: (file) => this._helpers.isNodeModulesDir(file),
+          promises.push(this._processHastePackage(filePath));
-      }).map(file => this._processHastePackage(file))
+        }
-    );
+      }
-
+    });
-    return Promise.all(promises);
+    return Promise.all(promises).then(() => this._map);
   }
 
   processFileChange(type, absPath) {
@@ -106,7 +106,7 @@ class HasteMap {
 
   _processHastePackage(file) {
     file = path.resolve(file);
-    const p = this._moduleCache.getPackage(file, this._fastfs);
+    const p = this._moduleCache.getPackage(file);
     return p.isHaste()
       .then(isHaste => isHaste && p.getName()
             .then(name => this._updateHasteMap(name, p)))

packager/react-packager/src/DependencyResolver/DependencyGraph/ResolutionRequest.js

@@ -10,7 +10,8 @@
 
 const debug = require('debug')('ReactNativePackager:DependencyGraph');
 const util = require('util');
-const path = require('path');
+const path = require('fast-path');
+const realPath = require('path');
 const isAbsolutePath = require('absolute-path');
 const getAssetDataFromName = require('../lib/getAssetDataFromName');
 const Promise = require('promise');
@@ -287,7 +288,7 @@ class ResolutionRequest {
 
           const searchQueue = [];
           for (let currDir = path.dirname(fromModule.path);
-               currDir !== path.parse(fromModule.path).root;
+               currDir !== realPath.parse(fromModule.path).root;
                currDir = path.dirname(currDir)) {
             searchQueue.push(
               path.join(currDir, 'node_modules', realModuleName)

packager/react-packager/src/DependencyResolver/DependencyGraph/index.js

@@ -14,7 +14,7 @@ const Promise = require('promise');
 const crawl = require('../crawlers');
 const getPlatformExtension = require('../lib/getPlatformExtension');
 const isAbsolutePath = require('absolute-path');
-const path = require('path');
+const path = require('fast-path');
 const util = require('util');
 const DependencyGraphHelpers = require('./DependencyGraphHelpers');
 const ResolutionRequest = require('./ResolutionRequest');
@@ -46,6 +46,7 @@ class DependencyGraph {
     extractRequires,
     transformCode,
     shouldThrowOnUnresolvedErrors = () => true,
+    enableAssetMap,
   }) {
     this._opts = {
       activity: activity || defaultActivity,
@@ -60,8 +61,9 @@ class DependencyGraph {
       extensions: extensions || ['js', 'json'],
       mocksPattern,
       extractRequires,
-      shouldThrowOnUnresolvedErrors,
       transformCode,
+      shouldThrowOnUnresolvedErrors,
+      enableAssetMap: enableAssetMap || true,
     };
     this._cache = cache;
     this._helpers = new DependencyGraphHelpers(this._opts);
@@ -121,25 +123,33 @@ class DependencyGraph {
       ignoreFilePath: this._opts.ignoreFilePath,
       assetExts: this._opts.assetExts,
       activity: this._opts.activity,
+      enabled: this._opts.enableAssetMap,
     });
 
     this._loading = Promise.all([
       this._fastfs.build()
         .then(() => {
           const hasteActivity = activity.startEvent('Building Haste Map');
-          return this._hasteMap.build().then(() => activity.endEvent(hasteActivity));
+          return this._hasteMap.build().then(map => {
+            activity.endEvent(hasteActivity);
+            return map;
+          });
         }),
       this._deprecatedAssetMap.build(),
-    ]).then(() =>
+    ]).then(
-      activity.endEvent(depGraphActivity)
+      response => {
-    ).catch(err => {
+        activity.endEvent(depGraphActivity);
+        return response[0]; // Return the haste map
+      },
+      err => {
         const error = new Error(
           `Failed to build DependencyGraph: ${err.message}`
         );
         error.type = ERROR_BUILDING_DEP_GRAPH;
         error.stack = err.stack;
         throw error;
-    });
+      }
+    );
 
     return this._loading;
   }

packager/react-packager/src/DependencyResolver/FileWatcher/__mocks__/sane.js

@@ -10,4 +10,5 @@
 
 module.exports = {
   WatchmanWatcher: jest.genMockFromModule('sane/src/watchman_watcher'),
+  NodeWatcher: jest.genMockFromModule('sane/src/node_watcher'),
 };

packager/react-packager/src/DependencyResolver/FileWatcher/__tests__/FileWatcher-test.js

@@ -13,23 +13,27 @@ jest
   .dontMock('events')
   .dontMock('../')
   .setMock('child_process', {
-    exec: function(cmd, cb) {
+    exec: (cmd, cb) => cb(null, '/usr/bin/watchman'),
-      cb(null, '/usr/bin/watchman');
-    },
   });
 
-var sane = require('sane');
+const sane = require('sane');
 
-describe('FileWatcher', function() {
+describe('FileWatcher', () => {
-  var Watcher;
+  let WatchmanWatcher;
-  var FileWatcher;
+  let NodeWatcher;
-  var config;
+  let FileWatcher;
+  let config;
+
+  beforeEach(() => {
+    WatchmanWatcher = sane.WatchmanWatcher;
+    WatchmanWatcher.prototype.once.mockImplementation(
+      (type, callback) => callback()
+    );
+    NodeWatcher = sane.NodeWatcher;
+    NodeWatcher.prototype.once.mockImplementation(
+      (type, callback) => callback()
+    );
 
-  beforeEach(function() {
-    Watcher = sane.WatchmanWatcher;
-    Watcher.prototype.once.mockImplementation(function(type, callback) {
-      callback();
-    });
     FileWatcher = require('../');
 
     config = [{
@@ -41,38 +45,45 @@ describe('FileWatcher', function() {
     }];
   });
 
-  pit('it should get the watcher instance when ready', function() {
+  pit('gets the watcher instance when ready', () => {
-    var fileWatcher = new FileWatcher(config);
+    const fileWatcher = new FileWatcher(config, {useWatchman: true});
-    return fileWatcher.getWatchers().then(function(watchers) {
+    return fileWatcher.getWatchers().then(watchers => {
-      watchers.forEach(function(watcher) {
+      watchers.forEach(watcher => {
-        expect(watcher instanceof Watcher).toBe(true);
+        expect(watcher instanceof WatchmanWatcher).toBe(true);
       });
     });
   });
 
-  pit('should emit events', function() {
+  pit('gets the node watcher if watchman is disabled', () => {
-    var cb;
+    const fileWatcher = new FileWatcher(config, {useWatchman: false});
-    Watcher.prototype.on.mockImplementation(function(type, callback) {
+    return fileWatcher.getWatchers().then(watchers => {
+      watchers.forEach(watcher => {
+        expect(watcher instanceof NodeWatcher).toBe(true);
+      });
+    });
+  });
+
+  pit('emits events', () => {
+    let cb;
+    WatchmanWatcher.prototype.on.mockImplementation((type, callback) => {
       cb = callback;
     });
-    var fileWatcher = new FileWatcher(config);
+    const fileWatcher = new FileWatcher(config, {useWatchman: true});
-    var handler = jest.genMockFn();
+    const handler = jest.genMockFn();
     fileWatcher.on('all', handler);
-    return fileWatcher.getWatchers().then(function() {
+    return fileWatcher.getWatchers().then(watchers => {
       cb(1, 2, 3, 4);
       jest.runAllTimers();
       expect(handler.mock.calls[0]).toEqual([1, 2, 3, 4]);
     });
   });
 
-  pit('it should end the watcher', function() {
+  pit('ends the watcher', () => {
-    var fileWatcher = new FileWatcher(config);
+    const fileWatcher = new FileWatcher(config, {useWatchman: true});
-    Watcher.prototype.close.mockImplementation(function(callback) {
+    WatchmanWatcher.prototype.close.mockImplementation(callback => callback());
-      callback();
-    });
 
-    return fileWatcher.end().then(function() {
+    return fileWatcher.end().then(() => {
-      expect(Watcher.prototype.close).toBeCalled();
+      expect(WatchmanWatcher.prototype.close).toBeCalled();
     });
   });
 });

packager/react-packager/src/DependencyResolver/FileWatcher/index.js

@@ -30,17 +30,18 @@ let inited = false;
 
 class FileWatcher extends EventEmitter {
 
-  constructor(rootConfigs) {
+  constructor(rootConfigs, options) {
     if (inited) {
       throw new Error('FileWatcher can only be instantiated once');
     }
     inited = true;
 
     super();
+    this._useWatchman = options.useWatchman;
     this._watcherByRoot = Object.create(null);
 
     this._loading = Promise.all(
-      rootConfigs.map(createWatcher)
+      rootConfigs.map(rootConfig => this._createWatcher(rootConfig))
     ).then(watchers => {
       watchers.forEach((watcher, i) => {
         this._watcherByRoot[rootConfigs[i].dir] = watcher;
@@ -65,9 +66,9 @@ class FileWatcher extends EventEmitter {
   }
 
   isWatchman() {
-    return detectingWatcherClass.then(
+    return this._useWatchman ? detectingWatcherClass.then(
       Watcher => Watcher === sane.WatchmanWatcher
-    );
+    ) : Promise.resolve(false);
   }
 
   end() {
@@ -79,6 +80,30 @@ class FileWatcher extends EventEmitter {
     );
   }
 
+  _createWatcher(rootConfig) {
+    return detectingWatcherClass.then(Watcher => {
+      if (!this._useWatchman) {
+        Watcher = sane.NodeWatcher;
+      }
+      const watcher = new Watcher(rootConfig.dir, {
+        glob: rootConfig.globs,
+        dot: false,
+      });
+
+      return new Promise((resolve, reject) => {
+        const rejectTimeout = setTimeout(
+          () => reject(new Error(timeoutMessage(Watcher))),
+          MAX_WAIT_TIME
+        );
+
+        watcher.once('ready', () => {
+          clearTimeout(rejectTimeout);
+          resolve(watcher);
+        });
+      });
+    });
+  }
+
   static createDummyWatcher() {
     return Object.assign(new EventEmitter(), {
       isWatchman: () => Promise.resolve(false),
@@ -87,26 +112,6 @@ class FileWatcher extends EventEmitter {
   }
 }
 
-function createWatcher(rootConfig) {
-  return detectingWatcherClass.then(function(Watcher) {
-    const watcher = new Watcher(rootConfig.dir, {
-      glob: rootConfig.globs,
-      dot: false,
-    });
-
-    return new Promise(function(resolve, reject) {
-      const rejectTimeout = setTimeout(function() {
-        reject(new Error(timeoutMessage(Watcher)));
-      }, MAX_WAIT_TIME);
-
-      watcher.once('ready', function() {
-        clearTimeout(rejectTimeout);
-        resolve(watcher);
-      });
-    });
-  });
-}
-
 function timeoutMessage(Watcher) {
   const lines = [
     'Watcher took too long to load (' + Watcher.name + ')',

packager/react-packager/src/DependencyResolver/Module.js

@@ -12,7 +12,7 @@ const crypto = require('crypto');
 const docblock = require('./DependencyGraph/docblock');
 const isAbsolutePath = require('absolute-path');
 const jsonStableStringify = require('json-stable-stringify');
-const path = require('path');
+const path = require('fast-path');
 const extractRequires = require('./lib/extractRequires');
 
 class Module {
@@ -30,7 +30,7 @@ class Module {
       throw new Error('Expected file to be absolute path but got ' + file);
     }
 
-    this.path = path.resolve(file);
+    this.path = file;
     this.type = 'Module';
 
     this._fastfs = fastfs;
@@ -132,7 +132,7 @@ class Module {
         const fileContentPromise = this._fastfs.readFile(this.path);
         return Promise.all([
           fileContentPromise,
-          this._readDocBlock(fileContentPromise)
+          this._readDocBlock(fileContentPromise),
         ]).then(([code, {id, moduleDocBlock}]) => {
           // Ignore requires in JSON files or generated code. An example of this
           // is prebuilt files like the SourceMap library.
@@ -151,7 +151,7 @@ class Module {
               return {id, code, dependencies, map};
             });
           }
-        })
+        });
       }
     );
   }

packager/react-packager/src/DependencyResolver/ModuleCache.js

@@ -3,7 +3,7 @@
 const AssetModule = require('./AssetModule');
 const Package = require('./Package');
 const Module = require('./Module');
-const path = require('path');
+const path = require('fast-path');
 
 class ModuleCache {
 
@@ -26,7 +26,6 @@ class ModuleCache {
   }
 
   getModule(filePath) {
-    filePath = path.resolve(filePath);
     if (!this._moduleCache[filePath]) {
       this._moduleCache[filePath] = new Module({
         file: filePath,
@@ -46,7 +45,6 @@ class ModuleCache {
   }
 
   getAssetModule(filePath) {
-    filePath = path.resolve(filePath);
     if (!this._moduleCache[filePath]) {
       this._moduleCache[filePath] = new AssetModule({
         file: filePath,
@@ -59,7 +57,6 @@ class ModuleCache {
   }
 
   getPackage(filePath) {
-    filePath = path.resolve(filePath);
     if (!this._packageCache[filePath]) {
       this._packageCache[filePath] = new Package({
         file: filePath,

packager/react-packager/src/DependencyResolver/Package.js

@@ -1,12 +1,12 @@
 'use strict';
 
 const isAbsolutePath = require('absolute-path');
-const path = require('path');
+const path = require('fast-path');
 
 class Package {
 
   constructor({ file, fastfs, cache }) {
-    this.path = path.resolve(file);
+    this.path = file;
     this.root = path.dirname(this.path);
     this._fastfs = fastfs;
     this.type = 'Package';

packager/react-packager/src/DependencyResolver/__tests__/Module-test.js

@@ -202,9 +202,9 @@ describe('Module', () => {
     let transformCode;
     const fileContents = 'arbitrary(code);';
     const exampleCode = `
-      require('a');
+      ${'require'}('a');
-      arbitrary.code('b');
+      ${'System.import'}('b');
-      require('c');`;
+      ${'require'}('c');`;
 
     beforeEach(function() {
       transformCode = jest.genMockFn();
@@ -281,7 +281,7 @@ describe('Module', () => {
       const callsEqual = ([path1, key1], [path2, key2]) => {
         expect(path1).toEqual(path2);
         expect(key1).toEqual(key2);
-      }
+      };
 
       it('gets dependencies from the cache with the same cache key for the same transform options', () => {
         const options = {some: 'options'};
@@ -293,7 +293,6 @@ describe('Module', () => {
       });
 
       it('gets dependencies from the cache with the same cache key for the equivalent transform options', () => {
-        const options = {some: 'options'};
         module.getDependencies({a: 'b', c: 'd'}); // first call
         module.getDependencies({c: 'd', a: 'b'}); // second call
 
@@ -318,7 +317,6 @@ describe('Module', () => {
       });
 
       it('gets code from the cache with the same cache key for the equivalent transform options', () => {
-        const options = {some: 'options'};
         module.getCode({a: 'b', c: 'd'}); // first call
         module.getCode({c: 'd', a: 'b'}); // second call
 

packager/react-packager/src/DependencyResolver/crawlers/node.js

@@ -3,7 +3,7 @@
 const Promise = require('promise');
 const debug = require('debug')('ReactNativePackager:DependencyGraph');
 const fs = require('graceful-fs');
-const path = require('path');
+const path = require('fast-path');
 
 const readDir = Promise.denodeify(fs.readdir);
 const stat = Promise.denodeify(fs.stat);

packager/react-packager/src/DependencyResolver/crawlers/watchman.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const Promise = require('promise');
-const path = require('path');
+const path = require('fast-path');
 
 function watchmanRecReadDir(roots, {ignore, fileWatcher, exts}) {
   const files = [];
@@ -38,20 +38,16 @@ function watchmanRecReadDir(roots, {ignore, fileWatcher, exts}) {
 
           const cmd = Promise.denodeify(watcher.client.command.bind(watcher.client));
           return cmd(['query', watchedRoot, {
-            'suffix': exts,
+            suffix: exts,
-            'expression': ['allof', ['type', 'f'], 'exists', dirExpr],
+            expression: ['allof', ['type', 'f'], 'exists', dirExpr],
-            'fields': ['name'],
+            fields: ['name'],
           }]).then(resp => {
             if ('warning' in resp) {
               console.warn('watchman warning: ', resp.warning);
             }
 
             resp.files.forEach(filePath => {
-              filePath = path.join(
+              filePath = watchedRoot + path.sep + filePath;
-                watchedRoot,
-                filePath
-              );
-
               if (!ignore(filePath)) {
                 files.push(filePath);
               }
@@ -64,7 +60,7 @@ function watchmanRecReadDir(roots, {ignore, fileWatcher, exts}) {
 }
 
 function isDescendant(root, child) {
-  return path.relative(root, child).indexOf('..') !== 0;
+  return child.startsWith(root);
 }
 
 module.exports = watchmanRecReadDir;

packager/react-packager/src/DependencyResolver/fastfs.js

@@ -12,7 +12,7 @@ const Promise = require('promise');
 const {EventEmitter} = require('events');
 
 const fs = require('graceful-fs');
-const path = require('path');
+const path = require('fast-path');
 
 // workaround for https://github.com/isaacs/node-graceful-fs/issues/56
 // fs.close is patched, whereas graceful-fs.close is not.
@@ -21,8 +21,6 @@ const fsClose = require('fs').close;
 const readFile = Promise.denodeify(fs.readFile);
 const stat = Promise.denodeify(fs.stat);
 
-const hasOwn = Object.prototype.hasOwnProperty;
-
 const NOT_FOUND_IN_ROOTS = 'NotFoundInRootsError';
 
 class Fastfs extends EventEmitter {
@@ -31,17 +29,20 @@ class Fastfs extends EventEmitter {
     this._name = name;
     this._fileWatcher = fileWatcher;
     this._ignore = ignore;
-    this._roots = roots.map(root => new File(root, { isDir: true }));
+    this._roots = roots.map(root => {
+      // If the path ends in a separator ("/"), remove it to make string
+      // operations on paths safer.
+      if (root.endsWith(path.sep)) {
+        root = root.substr(0, root.length - 1);
+      }
+      return new File(root, true);
+    });
     this._fastPaths = Object.create(null);
     this._crawling = crawling;
     this._activity = activity;
   }
 
   build() {
-    const rootsPattern = new RegExp(
-      '^(' + this._roots.map(root => escapeRegExp(root.path)).join('|') + ')'
-    );
-
     return this._crawling.then(files => {
       let fastfsActivity;
       const activity = this._activity;
@@ -49,18 +50,16 @@ class Fastfs extends EventEmitter {
         fastfsActivity = activity.startEvent('Building in-memory fs for ' + this._name);
       }
       files.forEach(filePath => {
-        if (filePath.match(rootsPattern)) {
+        const root = this._getRoot(filePath);
-          const newFile = new File(filePath, { isDir: false });
+        if (root) {
-          const parent = this._fastPaths[path.dirname(filePath)];
+          const newFile = new File(filePath, false);
+          const dirname = filePath.substr(0, filePath.lastIndexOf(path.sep));
+          const parent = this._fastPaths[dirname];
+          this._fastPaths[filePath] = newFile;
           if (parent) {
-            parent.addChild(newFile);
+            parent.addChild(newFile, this._fastPaths);
           } else {
-            this._add(newFile);
+            root.addChild(newFile, this._fastPaths);
-            for (let file = newFile; file; file = file.parent) {
-              if (!this._fastPaths[file.path]) {
-                this._fastPaths[file.path] = file;
-              }
-            }
           }
         }
       });
@@ -72,42 +71,24 @@ class Fastfs extends EventEmitter {
   }
 
   stat(filePath) {
-    return Promise.resolve().then(() => {
+    return Promise.resolve().then(() => this._getFile(filePath).stat());
-      const file = this._getFile(filePath);
-      return file.stat();
-    });
   }
 
   getAllFiles() {
-    // one-level-deep flatten of files
+    return Object.keys(this._fastPaths)
-    return [].concat(...this._roots.map(root => root.getFiles()));
+      .filter(filePath => !this._fastPaths[filePath].isDir);
-  }
-
-  findFilesByExt(ext, { ignore } = {}) {
-    return this.findFilesByExts([ext], {ignore});
   }
 
   findFilesByExts(exts, { ignore } = {}) {
     return this.getAllFiles()
-      .filter(file => (
+      .filter(filePath => (
-        exts.indexOf(file.ext()) !== -1 && (!ignore || !ignore(file.path))
+        exts.indexOf(path.extname(filePath).substr(1)) !== -1 &&
-      ))
+        (!ignore || !ignore(filePath))
-      .map(file => file.path);
+      ));
-  }
-
-  findFilesByName(name, { ignore } = {}) {
-    return this.getAllFiles()
-      .filter(
-        file => path.basename(file.path) === name &&
-          (!ignore || !ignore(file.path))
-      )
-      .map(file => file.path);
   }
 
   matchFilesByPattern(pattern) {
-    return this.getAllFiles()
+    return this.getAllFiles().filter(file => file.match(pattern));
-      .filter(file => file.path.match(pattern))
-      .map(file => file.path);
   }
 
   readFile(filePath) {
@@ -198,25 +179,25 @@ class Fastfs extends EventEmitter {
 
   _getFile(filePath) {
     filePath = path.normalize(filePath);
-    if (!hasOwn.call(this._fastPaths, filePath)) {
+    if (!this._fastPaths[filePath]) {
-      this._fastPaths[filePath] = this._getAndAssertRoot(filePath).getFileFromPath(filePath);
+      const file = this._getAndAssertRoot(filePath).getFileFromPath(filePath);
+      if (file) {
+        this._fastPaths[filePath] = file;
+      }
     }
 
     return this._fastPaths[filePath];
   }
 
-  _add(file) {
+  _processFileChange(type, filePath, rootPath, fstat) {
-    this._getAndAssertRoot(file.path).addChild(file);
+    const absPath = path.join(rootPath, filePath);
-  }
-
-  _processFileChange(type, filePath, root, fstat) {
-    const absPath = path.join(root, filePath);
     if (this._ignore(absPath) || (fstat && fstat.isDirectory())) {
       return;
     }
 
     // Make sure this event belongs to one of our roots.
-    if (!this._getRoot(absPath)) {
+    const root = this._getRoot(absPath);
+    if (!root) {
       return;
     }
 
@@ -230,20 +211,19 @@ class Fastfs extends EventEmitter {
     delete this._fastPaths[path.normalize(absPath)];
 
     if (type !== 'delete') {
-      this._add(new File(absPath, { isDir: false }));
+      const file = new File(absPath, false);
+      root.addChild(file, this._fastPaths);
     }
 
-    this.emit('change', type, filePath, root, fstat);
+    this.emit('change', type, filePath, rootPath, fstat);
   }
 }
 
 class File {
-  constructor(filePath, { isDir }) {
+  constructor(filePath, isDir) {
     this.path = filePath;
-    this.isDir = Boolean(isDir);
+    this.isDir = isDir;
-    if (this.isDir) {
+    this.children = this.isDir ? Object.create(null) : null;
-      this.children = Object.create(null);
-    }
   }
 
   read() {
@@ -270,29 +250,24 @@ class File {
     return this._stat;
   }
 
-  addChild(file) {
+  addChild(file, fileMap) {
-    const parts = path.relative(this.path, file.path).split(path.sep);
+    const parts = file.path.substr(this.path.length + 1).split(path.sep);
-
-    if (parts.length === 0) {
-      return;
-    }
-
     if (parts.length === 1) {
       this.children[parts[0]] = file;
       file.parent = this;
     } else if (this.children[parts[0]]) {
-      this.children[parts[0]].addChild(file);
+      this.children[parts[0]].addChild(file, fileMap);
     } else {
-      const dir = new File(path.join(this.path, parts[0]), { isDir: true });
+      const dir = new File(this.path + path.sep + parts[0], true);
       dir.parent = this;
       this.children[parts[0]] = dir;
-      dir.addChild(file);
+      fileMap[dir.path] = dir;
+      dir.addChild(file, fileMap);
     }
   }
 
   getFileFromPath(filePath) {
-    const parts = path.relative(this.path, filePath)
+    const parts = path.relative(this.path, filePath).split(path.sep);
-            .split(path.sep);
 
     /*eslint consistent-this:0*/
     let file = this;
@@ -313,21 +288,8 @@ class File {
     return file;
   }
 
-  getFiles() {
-    let files = [];
-    Object.keys(this.children).forEach(key => {
-      const file = this.children[key];
-      if (file.isDir) {
-        files = files.concat(file.getFiles());
-      } else {
-        files.push(file);
-      }
-    });
-    return files;
-  }
-
   ext() {
-    return path.extname(this.path).replace(/^\./, '');
+    return path.extname(this.path).substr(1);
   }
 
   remove() {
@@ -392,11 +354,7 @@ function makeReadCallback(fd, predicate, callback) {
 }
 
 function isDescendant(root, child) {
-  return path.relative(root, child).indexOf('..') !== 0;
+  return child.startsWith(root);
-}
-
-function escapeRegExp(str) {
-  return str.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, '\\$&');
 }
 
 module.exports = Fastfs;

packager/react-packager/src/DependencyResolver/lib/extractRequires.js

@@ -39,7 +39,7 @@ function extractRequires(code) {
     .replace(replacePatterns.REQUIRE_RE, (match, pre, quot, dep, post) => {
       deps.sync.push(dep);
       return match;
-    })
+    });
 
   return {code, deps};
 }

packager/react-packager/src/DependencyResolver/lib/getAssetDataFromName.js

@@ -8,7 +8,7 @@
  */
 'use strict';
 
-const path = require('path');
+const path = require('fast-path');
 const getPlatformExtension = require('./getPlatformExtension');
 
 function getAssetDataFromName(filename) {

packager/react-packager/src/DependencyResolver/lib/getPlatformExtension.js

@@ -8,19 +8,21 @@
  */
 'use strict';
 
-const SUPPORTED_PLATFORM_EXTS = ['android', 'ios', 'web'];
+const SUPPORTED_PLATFORM_EXTS = {
-
+  android: true,
-const re = new RegExp(
+  ios: true,
-  '[^\\.]+\\.(' + SUPPORTED_PLATFORM_EXTS.join('|') + ')\\.\\w+$'
+  web: true,
-);
+};
 
 // Extract platform extension: index.ios.js -> ios
 function getPlatformExtension(file) {
-  const match = file.match(re);
+  const last = file.lastIndexOf('.');
-  if (match && match[1]) {
+  const secondToLast = file.lastIndexOf('.', last - 1);
-    return match[1];
+  if (secondToLast === -1) {
-  }
     return null;
+  }
+  const platform = file.substring(secondToLast + 1, last);
+  return SUPPORTED_PLATFORM_EXTS[platform] ? platform : null;
 }
 
 module.exports = getPlatformExtension;

packager/react-packager/src/Server/index.js

@@ -182,7 +182,7 @@ class Server {
 
     this._fileWatcher = options.nonPersistent
       ? FileWatcher.createDummyWatcher()
-      : new FileWatcher(watchRootConfigs);
+      : new FileWatcher(watchRootConfigs, {useWatchman: true});
 
     this._assetServer = new AssetServer({
       projectRoots: opts.projectRoots,