#62 Make current version part of cache key.

src/FSCache.js

@@ -2,6 +2,7 @@ const fs = require('./utils/fs');
 const path = require('path');
 const md5 = require('./utils/md5');
 const objectHash = require('./utils/objectHash');
+const pjson = require('../package.json');
 
 // These keys can affect the output, so if they differ, the cache should not match
 const OPTION_KEYS = ['publicURL', 'minify', 'hmr'];
@@ -10,8 +11,12 @@ class FSCache {
   constructor(options) {
     this.dir = path.resolve(options.cacheDir || '.cache');
     this.dirExists = false;
-    this.invalidated = new Set;
-    this.optionsHash = objectHash(OPTION_KEYS.reduce((p, k) => (p[k] = options[k], p), {}));
+    this.invalidated = new Set();
+    this.optionsHash = objectHash(
+      OPTION_KEYS.reduce((p, k) => ((p[k] = options[k]), p), {
+        version: pjosn.version,
+      })
+    );
   }
 
   async ensureDirExists() {