use realpath-native

Author: aleclarson

packages/jest-haste-map/package.json

@@ -15,6 +15,7 @@
     "jest-serializer": "^23.0.1",
     "jest-worker": "^23.2.0",
     "micromatch": "^2.3.11",
+    "realpath-native": "^1.0.0",
     "sane": "^2.0.0"
   }
 }

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

@@ -200,6 +200,7 @@ module.exports = async function watchmanCrawl(
         if (existingMetaData && existingMetaData[H.MTIME] === mtime) {
           cache.set(name, existingMetaData);
         } else if (fileData.type !== 'f') {
+          // See ../constants.js
           cache.set(name, [undefined, mtime]);
         } else if (
           existingMetaData &&
@@ -214,6 +215,7 @@ module.exports = async function watchmanCrawl(
             existingMetaData[4],
           ]);
         } else {
+          // See ../constants.js
           cache.set(name, ['', mtime, 0, [], sha1hex]);
         }
       }

packages/jest-haste-map/src/haste_fs.js

@@ -10,9 +10,9 @@
 import type {Glob, Path} from 'types/Config';
 import type {FileData, LinkData} from 'types/HasteMap';
 
-import fs from 'fs';
 import path from 'path';
 import micromatch from 'micromatch';
+import {sync as realpath} from 'realpath-native';
 import H from './constants';
 
 export default class HasteFS {
@@ -45,7 +45,13 @@ export default class HasteFS {
 
   follow(file: Path): Path {
     const link = this._links[file];
-    return link ? link[0] || (link[0] = fs.realpathSync(file)) : file;
+    if (link === undefined) {
+      return file;
+    }
+    if (link[0] === undefined) {
+      link[0] = realpath(file);
+    }
+    return link[0];
   }
 
   getAllFiles(): Array<string> {