Merge pull request facebook#79 from zinserjan/fix-jest-caching

Jest cache busting for ts/tsx files

Author: wmonk

packages/react-scripts/config/jest/typescriptTransform.js

@@ -3,8 +3,10 @@
 'use strict';
 
 const fs = require('fs');
+const crypto = require('crypto');
 const tsc = require('typescript');
 const tsconfigPath = require('app-root-path').resolve('/tsconfig.json');
+const THIS_FILE = fs.readFileSync(__filename);
 
 let compilerConfig = {
   module: tsc.ModuleKind.CommonJS,
@@ -30,4 +32,20 @@ module.exports = {
     }
     return src;
   },
+  getCacheKey(fileData, filePath, configStr, options) {
+    return crypto
+      .createHash('md5')
+      .update(THIS_FILE)
+      .update('\0', 'utf8')
+      .update(fileData)
+      .update('\0', 'utf8')
+      .update(filePath)
+      .update('\0', 'utf8')
+      .update(configStr)
+      .update('\0', 'utf8')
+      .update(JSON.stringify(compilerConfig))
+      .update('\0', 'utf8')
+      .update(options.instrument ? 'instrument' : '')
+      .digest('hex');
+  },
 };