feat: support post loaders for template blocks (#1500)

Author: davidguilherme

Diff for: lib/loaders/pitcher.js

@@ -10,6 +10,8 @@ const isNullLoader = l => /(\/|\\|@)null-loader/.test(l.path)
 const isCSSLoader = l => /(\/|\\|@)css-loader/.test(l.path)
 const isCacheLoader = l => /(\/|\\|@)cache-loader/.test(l.path)
 const isPitcher = l => l.path !== __filename
+const isPreLoader = l => !l.pitchExecuted
+const isPostLoader = l => l.pitchExecuted
 
 const dedupeESLintLoader = loaders => {
   const res = []
@@ -136,10 +138,15 @@ module.exports.pitch = function (remainingRequest) {
         cacheIdentifier: hash(cacheIdentifier) + '-vue-loader-template'
       })}`]
       : []
+
+    const preLoaders = loaders.filter(isPreLoader)
+    const postLoaders = loaders.filter(isPostLoader)
+
     const request = genRequest([
       ...cacheLoader,
+      ...postLoaders,
       templateLoaderPath + `??vue-loader-options`,
-      ...loaders
+      ...preLoaders
     ])
     // console.log(request)
     // the template compiler uses esm exports

Diff for: test/template.spec.js

@@ -305,3 +305,22 @@ test('disable prettify', done => {
     done()
   })
 })
+
+test('postLoaders support', done => {
+  mockBundleAndRun({
+    entry: 'basic.vue',
+    module: {
+      rules: [
+        {
+          resourceQuery: /^\?vue&type=template/,
+          enforce: 'post',
+          loader: path.resolve(__dirname, './mock-loaders/html')
+        }
+      ]
+    }
+  }, ({ module }) => {
+    // class="red" -> { staticClass: "red" } -> { staticClass: "green" }
+    expect(module.render.toString()).toMatch(`green`)
+    done()
+  })
+})