Merge pull request #9559 from tschaub/minify-worker

Minify worker

examples/webpack/worker-loader.js

@@ -3,7 +3,15 @@ const build = require('../../tasks/serialize-workers').build;
 function loader() {
   const callback = this.async();
 
-  build(this.resource, {minify: false})
+  let minify = false;
+
+  // TODO: remove when https://github.com/webpack/webpack/issues/6496 is addressed
+  const compilation = this._compilation;
+  if (compilation) {
+    minify = compilation.compiler.options.mode === 'production';
+  }
+
+  build(this.resource, {minify})
     .then(chunk => {
       for (const filePath in chunk.modules) {
         this.addDependency(filePath);

tasks/serialize-workers.js

@@ -29,8 +29,14 @@ async function build(input, {minify = true} = {}) {
           }
         ]
       ]
-    }),
+    })
-    {
+  ];
+
+  if (minify) {
+    plugins.push(terser());
+  }
+
+  plugins.push({
     name: 'serialize worker and export create function',
     renderChunk(code) {
       return `
@@ -42,12 +48,7 @@ async function build(input, {minify = true} = {}) {
         }
       `;
     }
-    }
+  });
-  ];
-
-  if (minify) {
-    plugins.push(terser());
-  }
 
   const bundle = await rollup.rollup({input, plugins});
   const {output} = await bundle.generate({format: 'es'});