fix: compat with null-loader (close #1239)

lib/loaders/pitcher.js

@@ -12,6 +12,11 @@ module.exports.pitch = function (remainingRequest) {
   const query = qs.parse(this.resourceQuery.slice(1))
   const loaders = this.loaders.slice(1) // remove self
 
+  // do not inject if user uses null-loader to void the type (#1239)
+  if (loaders.some(l => /(\/|\\)null-loader/.test(l.path))) {
+    return
+  }
+
   // loader.request contains both the resolved loader path and its options
   // query (e.g. ??ref-0)
   const toLoaderString = loader => loader.request

package.json

@@ -59,6 +59,7 @@
     "mini-css-extract-plugin": "^0.2.0",
     "node-sass": "^4.7.2",
     "normalize-newline": "^3.0.0",
+    "null-loader": "^0.1.1",
     "postcss-loader": "^2.1.2",
     "pug": "^2.0.1",
     "pug-plain-loader": "^1.0.0",

test/edgeCases.spec.js

@@ -148,3 +148,17 @@ test('html-webpack-plugin', done => {
     done()
   }, true)
 })
+
+test('usage with null-loader', done => {
+  mockBundleAndRun({
+    entry: 'basic.vue',
+    modify: config => {
+      config.module.rules[1] = {
+        test: /\.css$/,
+        use: ['null-loader']
+      }
+    }
+  }, ({ window, exports, code }) => {
+    done()
+  })
+})

yarn.lock

@@ -5781,6 +5781,10 @@ nth-check@~1.0.1:
   dependencies:
     boolbase "~1.0.0"
 
+null-loader@^0.1.1:
+  version "0.1.1"
+  resolved "https://registry.yarnpkg.com/null-loader/-/null-loader-0.1.1.tgz#17be9abfcd3ff0e1512f6fc4afcb1f5039378fae"
+
 num2fraction@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/num2fraction/-/num2fraction-1.2.2.tgz#6f682b6a027a4e9ddfa4564cd2589d1d4e669ede"