Hendrixer · August 28, 2016 19:17 · Aug 28, 2016
diff --git a/InstallMissingModules.js b/InstallMissingModules.js
@@ -0,0 +1,58 @@
+const thenify = require('thenify')
+const webpack = require('webpack')
+const MemoryFS = require('memory-fs')
+const validateNpmPackageName = require('validate-npm-package-name')
+
+class InstallMissingModules {
+  constructor(options) {
+    this.options = options
+  }
+
+  apply(compiler) {
+    const runCompilerThenCallback = (...args) => {
+      const callback = args[args.length - 1]
+      this._runCompiler(compiler)
+        .then(() => callback(), callback)
+    };
+
+    compiler.plugin(`run`, runCompilerThenCallback)
+    compiler.plugin(`watch-run`, runCompilerThenCallback)
+  }
+
+  _runCompiler(compiler) {
+    const { options } = compiler
+    const { plugins } = options
+
+    return this._findMissingModuleList(Object.assign({}, options, {
+      plugins: plugins.filter(plugin => plugin.constructor !== InstallMissingModules)
+    }))
+    .then(list => this.options.callback(list))
+  }
+
+  _findMissingModuleList(webpackConfig) {
+    const webpackCompiler = webpack(webpackConfig)
+    webpackCompiler.outputFileSystem = new MemoryFS()
+    return new Promise((resolve, reject) => {
+      webpackCompiler.run((error, stats) => {
+        const { errors }  = stats.toJson()
+
+        const list = errors.map(error => {
+          if (/Module not found: Error: Cannot resolve module '(\S+)' in/.test(error)) {
+            return RegExp.$1
+          } else if (/Cannot find module '(\S+)'/.test(error)) {
+            return RegExp.$1
+          } else {
+            return undefined
+          }
+        })
+        .filter(it => !!it)
+        .map(it => it.split('/')[0])
+        .filter(it => validateNpmPackageName(it).validForNewPackages)
+
+        resolve(list)
+      })
+    })
+  }
+}
+
+module.exports = InstallMissingModules
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