Making processor-worker a real worker (to TypeScript) (#351)

src/codecs/processor-worker/index.ts

@@ -0,0 +1,56 @@
+import { expose } from 'comlink';
+import { EncodeOptions as MozJPEGEncoderOptions } from '../mozjpeg/encoder-meta';
+import { QuantizeOptions } from '../imagequant/processor-meta';
+import { EncodeOptions as OptiPNGEncoderOptions } from '../optipng/encoder-meta';
+import { EncodeOptions as WebPEncoderOptions } from '../webp/encoder-meta';
+
+async function mozjpegEncode(
+  data: ImageData, options: MozJPEGEncoderOptions,
+): Promise<ArrayBuffer> {
+  const { encode } = await import(
+    /* webpackChunkName: "process-mozjpeg-enc" */
+    '../mozjpeg/encoder',
+  );
+  return encode(data, options);
+}
+
+async function quantize(data: ImageData, opts: QuantizeOptions): Promise<ImageData> {
+  const { process } = await import(
+    /* webpackChunkName: "process-imagequant" */
+    '../imagequant/processor',
+  );
+  return process(data, opts);
+}
+
+async function optiPngEncode(
+  data: BufferSource, options: OptiPNGEncoderOptions,
+): Promise<ArrayBuffer> {
+  const { compress } = await import(
+    /* webpackChunkName: "process-optipng" */
+    '../optipng/encoder',
+  );
+  return compress(data, options);
+}
+
+async function webpEncode(
+  data: ImageData, options: WebPEncoderOptions,
+): Promise<ArrayBuffer> {
+  const { encode } = await import(
+    /* webpackChunkName: "process-webp-enc" */
+    '../webp/encoder',
+  );
+  return encode(data, options);
+}
+
+async function webpDecode(data: ArrayBuffer): Promise<ImageData> {
+  const { decode } = await import(
+    /* webpackChunkName: "process-webp-dec" */
+    '../webp/decoder',
+  );
+  return decode(data);
+}
+
+const exports = { mozjpegEncode, quantize, optiPngEncode, webpEncode, webpDecode };
+export type ProcessorWorkerApi = typeof exports;
+
+expose(exports, self);