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

@@ -29,26 +29,27 @@ async function build(input, {minify = true} = {}) {
           }
         ]
       ]
-    }),
-    {
-      name: 'serialize worker and export create function',
-      renderChunk(code) {
-        return `
-          const source = ${JSON.stringify(code)};
-          const blob = new Blob([source], {type: 'application/javascript'});
-          const url = URL.createObjectURL(blob);
-          export function create() {
-            return new Worker(url);
-          }
-        `;
-      }
-    }
+    })
   ];
 
   if (minify) {
     plugins.push(terser());
   }
 
+  plugins.push({
+    name: 'serialize worker and export create function',
+    renderChunk(code) {
+      return `
+        const source = ${JSON.stringify(code)};
+        const blob = new Blob([source], {type: 'application/javascript'});
+        const url = URL.createObjectURL(blob);
+        export function create() {
+          return new Worker(url);
+        }
+      `;
+    }
+  });
+
   const bundle = await rollup.rollup({input, plugins});
   const {output} = await bundle.generate({format: 'es'});