1 files changed, 42 insertions, 0 deletions
diff --git a/packages/excalidraw/subset/subset-worker.chunk.ts b/packages/excalidraw/subset/subset-worker.chunk.ts
new file mode 100644
index 0000000..5f4e92b
--- /dev/null
+++ b/packages/excalidraw/subset/subset-worker.chunk.ts
@@ -0,0 +1,42 @@
+/**
+ * DON'T depend on anything from the outside like `promiseTry`, as this module is part of a separate lazy-loaded chunk.
+ *
+ * Including anything from the main chunk would include the whole chunk by default.
+ * Even it it would be tree-shaken during build, it won't be tree-shaken in dev.
+ *
+ * In the future consider separating common utils into a separate shared chunk.
+ */
+
+import { Commands, subsetToBinary } from "./subset-shared.chunk";
+
+/**
+ * Due to this export (and related dynamic import), this worker code will be included in the bundle automatically (as a separate chunk),
+ * without the need for esbuild / vite /rollup plugins and special browser / server treatment.
+ *
+ * `import.meta.url` is undefined in nodejs
+ */
+export const WorkerUrl: URL | undefined = import.meta.url
+  ? new URL(import.meta.url)
+  : undefined;
+
+// run only in the worker context
+if (typeof window === "undefined" && typeof self !== "undefined") {
+  self.onmessage = async (e: {
+    data: {
+      command: typeof Commands.Subset;
+      arrayBuffer: ArrayBuffer;
+      codePoints: Array<number>;
+    };
+  }) => {
+    switch (e.data.command) {
+      case Commands.Subset:
+        const buffer = await subsetToBinary(
+          e.data.arrayBuffer,
+          e.data.codePoints,
+        );
+
+        self.postMessage(buffer, { transfer: [buffer] });
+        break;
+    }
+  };
+}