fix: directly used mkdirp instead of through Webpack (#436)

Fixes Webpack 5 usage by no longer requiring the removed webpack/lib/node/NodeOutputFileSystem

Author: Josh Goldberg

lib/fs.js

@@ -4,13 +4,11 @@ const fs = require('fs');
 const path = require('path');
 
 const MemoryFileSystem = require('memory-fs');
+const mkdirp = require('mkdirp');
 const { colors } = require('webpack-log');
-const NodeOutputFileSystem = require('webpack/lib/node/NodeOutputFileSystem');
 
 const DevMiddlewareError = require('./DevMiddlewareError');
 
-const { mkdirp } = new NodeOutputFileSystem();
-
 module.exports = {
   toDisk(context) {
     const compilers = context.compiler.compilers || [context.compiler];

package-lock.json

@@ -33,6 +33,7 @@
   "dependencies": {
     "memory-fs": "^0.4.1",
     "mime": "^2.4.2",
+    "mkdirp": "^0.5.1",
     "range-parser": "^1.2.1",
     "webpack-log": "^2.0.0"
   },