v1.0 with SW PWA enabled

frontend/node_modules/@rollup/plugin-terser/src/worker.ts

@@ -0,0 +1,58 @@
+import { isMainThread, parentPort, workerData } from 'worker_threads';
+
+import { hasOwnProperty, isObject } from 'smob';
+
+import { minify } from 'terser';
+
+import { workerPoolWorkerFlag } from './constants';
+
+import type { WorkerContextSerialized, WorkerOutput } from './type';
+
+/**
+ * Duck typing worker context.
+ *
+ * @param input
+ */
+function isWorkerContextSerialized(input: unknown): input is WorkerContextSerialized {
+  return (
+    isObject(input) &&
+    hasOwnProperty(input, 'code') &&
+    typeof input.code === 'string' &&
+    hasOwnProperty(input, 'options') &&
+    typeof input.options === 'string'
+  );
+}
+
+export function runWorker() {
+  if (isMainThread || !parentPort || workerData !== workerPoolWorkerFlag) {
+    return;
+  }
+
+  // eslint-disable-next-line no-eval
+  const eval2 = eval;
+
+  parentPort.on('message', async (data: WorkerContextSerialized) => {
+    if (!isWorkerContextSerialized(data)) {
+      return;
+    }
+
+    const options = eval2(`(${data.options})`);
+
+    const result = await minify(data.code, options);
+
+    const output: WorkerOutput = {
+      code: result.code || data.code,
+      nameCache: options.nameCache
+    };
+
+    if (typeof result.map === 'string') {
+      output.sourceMap = JSON.parse(result.map);
+    }
+
+    if (isObject(result.map)) {
+      output.sourceMap = result.map;
+    }
+
+    parentPort?.postMessage(output);
+  });
+}