Pass a literal worker type so Vite can bundle the ESM build

CHANGELOG.md

@@ -3,6 +3,14 @@
 All notable changes to this project are documented in this file. The format
 follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## Unreleased
+
+### Fixed
+
+- Vite can bundle `@project516/ffmpeg-wasm`. The ESM build passed the
+  worker type as a variable, and Vite's build fails with "Expected worker
+  options type property to be a literal value."
+
 ## 0.17.0
 
 ### Added

packages/ffmpeg/src/classes.ts

@@ -249,10 +249,10 @@ export class FFmpeg {
         new Worker(resolveWorkerURL(classWorkerURL), {
           type: WORKER_TYPE,
         }) :
-        // We need to duplicated the code here to enable webpack
-        // to bundle worker.js here.
+        // Duplicated so bundlers find and bundle worker.js. Vite needs a
+        // literal type; webpack turns it into a classic worker for UMD.
         new Worker(new URL("./worker.js", import.meta.url), {
-          type: WORKER_TYPE,
+          type: "module",
         });
       this.#registerHandlers();
     }