Unescape serialized snapshots for diffing

Author: thymikee

packages/jest-snapshot/src/State.js

@@ -19,6 +19,7 @@ const {
   keyToTestName,
   serialize,
   testNameToKey,
+  unescape,
 } = require('./utils');
 const fileExists = require('jest-file-exists');
 const fs = require('fs');
@@ -158,9 +159,9 @@ class SnapshotState {
       if (!pass) {
         this.unmatched++;
         return {
-          actual: receivedSerialized,
+          actual: unescape(receivedSerialized),
           count,
-          expected,
+          expected: unescape(expected),
           pass: false,
         };
       } else {

packages/jest-snapshot/src/utils.js

@@ -66,6 +66,12 @@ const serialize = (data: any): string => {
   }));
 };
 
+const unescape = (data: any): string => {
+  return data
+    .replace(/\\(")/g, '$1') // unescape double quotes
+    .replace(/\\([\\^$*+?.()|[\]{}])/g, '$1'); // then unescape RegExp
+};
+
 const printBacktickString = (str: string) => {
   return '`' + str.replace(/`|\\|\${/g, '\\$&') + '`';
 };
@@ -102,4 +108,5 @@ module.exports = {
   saveSnapshotFile,
   serialize,
   testNameToKey,
+  unescape,
 };