From 536862e1efb48806d73cc3fc4d60fb3dd1454c1f Mon Sep 17 00:00:00 2001
From: "Michael \"Z\" Goddard" <mzgoddard@gmail.com>
Date: Sun, 10 Dec 2017 19:18:14 -0500
Subject: [PATCH] Remove out of date cache before writing to it anew

---
 index.js | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 4e79bd1f..8e2983d3 100644
--- a/index.js
+++ b/index.js
@@ -4,7 +4,8 @@ var path = require('path');
 
 var level = require('level');
 var lodash = require('lodash');
-var mkdirp = require('mkdirp');
+var _mkdirp = require('mkdirp');
+var _rimraf = require('rimraf');
 
 var Promise = require('bluebird');
 var nodeObjectHash = require('node-object-hash');
@@ -95,6 +96,10 @@ function requestHash(request) {
   return crypto.createHash('sha1').update(request).digest().hexSlice();
 }
 
+var mkdirp = Promise.promisify(_mkdirp, {context: _mkdirp});
+mkdirp.sync = _mkdirp.sync.bind(_mkdirp);
+var rimraf = Promise.promisify(_rimraf);
+rimraf.sync = _rimraf.sync.bind(_rimraf);
 var fsReadFile = Promise.promisify(fs.readFile, {context: fs});
 var fsWriteFile = Promise.promisify(fs.writeFile, {context: fs});
 
@@ -713,7 +718,8 @@ HardSourceWebpackPlugin.prototype.apply = function(compiler) {
         resolverCache = {normal: {},loader: {},context: {}};
         fileTimestamps = {};
         contextTimestamps = {};
-        return;
+
+        return rimraf(cacheDirPath);
       }
 
       if (Object.keys(moduleCache).length) {return Promise.resolve();}
@@ -2055,8 +2061,13 @@ HardSourceWebpackPlugin.prototype.apply = function(compiler) {
     });
 
     Promise.all([
-      fsWriteFile(path.join(cacheDirPath, 'stamp'), currentStamp, 'utf8'),
-      fsWriteFile(path.join(cacheDirPath, 'version'), hardSourceVersion, 'utf8'),
+      mkdirp(cacheDirPath)
+      .then(function() {
+        return Promise.all([
+          fsWriteFile(path.join(cacheDirPath, 'stamp'), currentStamp, 'utf8'),
+          fsWriteFile(path.join(cacheDirPath, 'version'), hardSourceVersion, 'utf8'),
+        ]);
+      }),
       moduleResolveCacheSerializer.write(moduleResolveOps),
       assetCacheSerializer.write(assetOps),
       moduleCacheSerializer.write(moduleOps),