Rollup build

src/features/decoders/webp/worker/webpDecode.ts

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+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import webpDecoder, { WebPModule } from 'codecs/webp/dec/webp_dec';
+import wasmUrl from 'url:codecs/webp/dec/webp_dec.wasm';
+import { initEmscriptenModule, blobToArrayBuffer } from 'features/worker-utils';
+
+let emscriptenModule: Promise<WebPModule>;
+
+export default async function decode(blob: Blob): Promise<ImageData> {
+  if (!emscriptenModule) {
+    emscriptenModule = initEmscriptenModule(webpDecoder, wasmUrl);
+  }
+
+  const [module, data] = await Promise.all([
+    emscriptenModule,
+    blobToArrayBuffer(blob),
+  ]);
+
+  const result = module.decode(data);
+  if (!result) throw new Error('Decoding error');
+  return result;
+}