chore(deps): migrate to memfs (#1627)

Author: jamesgeorge007

Diff for: package.json

@@ -69,7 +69,7 @@
     "jsdom": "^11.6.2",
     "lint-staged": "^7.0.0",
     "markdown-loader": "^2.0.2",
-    "memory-fs": "^0.4.1",
+    "memfs": "^3.0.3",
     "mini-css-extract-plugin": "^0.4.1",
     "node-sass": "^4.7.2",
     "normalize-newline": "^3.0.0",

Diff for: test/utils.js

@@ -4,9 +4,9 @@ const hash = require('hash-sum')
 const { JSDOM, VirtualConsole } = require('jsdom')
 const webpack = require('webpack')
 const merge = require('webpack-merge')
-const MemoryFS = require('memory-fs')
+const { createFsFromVolume, Volume } = require('memfs')
 
-const mfs = new MemoryFS()
+const mfs = new createFsFromVolume(new Volume()) // eslint-disable-line
 const VueLoaderPlugin = require('../lib/plugin')
 
 const baseConfig = {
@@ -76,6 +76,7 @@ function bundle (options, cb, wontThrowError) {
 
   const webpackCompiler = webpack(config)
   webpackCompiler.outputFileSystem = mfs
+  webpackCompiler.outputFileSystem.join = path.join.bind(path)
   webpackCompiler.run((err, stats) => {
     const errors = stats.compilation.errors
     if (!wontThrowError) {