cli: switch to using esbuild for minifcation

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/package.json

@@ -61,7 +61,8 @@
     "commander": "^6.1.0",
     "css-loader": "^6.5.1",
     "diff": "^5.0.0",
-    "esbuild": "^0.14.1",
+    "esbuild": "^0.14.10",
+    "esbuild-loader": "^2.18.0",
     "eslint": "^7.30.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-formatter-friendly": "^7.0.0",

packages/cli/src/lib/bundler/optimization.ts

@@ -14,10 +14,9 @@
  * limitations under the License.
  */
 
-import { WebpackOptionsNormalized, WebpackPluginInstance } from 'webpack';
-import TerserPlugin from 'terser-webpack-plugin';
+import { WebpackOptionsNormalized } from 'webpack';
 import { BundlingOptions } from './types';
-import { isParallelDefault } from '../parallel';
+import { ESBuildMinifyPlugin } from 'esbuild-loader';
 
 export const optimization = (
   options: BundlingOptions,
@@ -26,16 +25,11 @@ export const optimization = (
 
   return {
     minimize: !isDev,
-    // Only configure when parallel is explicitly overridden from the default
-    ...(!isParallelDefault(options.parallel)
-      ? {
-          minimizer: [
-            new TerserPlugin({
-              parallel: options.parallel,
-            }) as unknown as WebpackPluginInstance,
-          ],
-        }
-      : {}),
+    minimizer: [
+      new ESBuildMinifyPlugin({
+        target: 'es2019',
+      }),
+    ],
     runtimeChunk: 'single',
     splitChunks: {
       automaticNameDelimiter: '-',