This recipe shows how to use WASM in Manifest V3.

To load WASM in Manifest V3, we need to use the wasm-unsafe-eval CSP directive (Content Security Policy).

1. Clone this repository.
2. Load this directory in Chrome as an unpacked extension.
3. Find the extension named "WASM Load Example - Helloworld" and inspect the service worker.

You will see the following output:

[from wasm] Inited.
[from wasm] Hello World!
[from wasm] Hello John

We have already built the WASM file for you. If you want to build it yourself, follow the steps below.

1. Install Rust.

2. Install wasm-pack.

   cargo install wasm-pack

3. Build WASM.

   cd wasm
   wasm-pack build --target web

• To import the script generated by wasm-pack, we need to declare the service worker as an ES Module.

 // manifest.json
 ...
 "background": {
     "service_worker": "background.js",
+    "type": "module"
 },
 ...