diff --git a/_headers.ejs b/_headers.ejs
index 82273b01..ccc5a559 100644
--- a/_headers.ejs
+++ b/_headers.ejs
@@ -1,6 +1,7 @@
 # Long-term cache by default.
 /*
   Cache-Control: max-age=31536000
+  Access-Control-Allow-Origin: *
 
 # And here are the exceptions:
 /
@@ -9,9 +10,8 @@
 /serviceworker.js
   Cache-Control: no-cache
 
-# Module imports need CORS, so we enable it for the SDK file.
-/squoosh.mjs
-  Access-Control-Allow-Origin: *
+/sdk.mjs
+  Cache-Control: no-cache
 
 /manifest.json
   Cache-Control: must-revalidate, max-age=3600
diff --git a/package.json b/package.json
index ab5005fc..41ab4457 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "version": "1.6.0",
   "license": "apache-2.0",
   "scripts": {
-    "build:sdk": "microbundle --compress -f es -o build -i src/sdk.ts",
+    "build:sdk": "microbundle --compress -f es -o build/sdk.mjs -i src/sdk.ts",
     "start": "webpack-dev-server --host 0.0.0.0 --hot",
     "build": "webpack -p && npm run build:sdk",
     "lint": "tslint -c tslint.json -p tsconfig.json -t verbose 'src/**/*.{ts,tsx,js,jsx}'",
diff --git a/src/components/compress/index.tsx b/src/components/compress/index.tsx
index 0ee1daf9..a8b87db1 100644
--- a/src/components/compress/index.tsx
+++ b/src/components/compress/index.tsx
@@ -48,7 +48,7 @@ export class SquooshStartEvent extends Event {
   }
 }
 
-export enum SquooshSideEventType {
+export const enum SquooshSideEventType {
   DONE = 'squoosh:done',
   ABORT = 'squoosh:abort',
   ERROR = 'squoosh:error',