serve.json

{
  "headers": [
    {
      "source": "**/*.wasm",
      "headers": [
        {
          "key": "Content-Type",
          "value": "application/wasm"
        }
      ]
    },
    {
      "source": "**/*.js",
      "headers": [
        {
          "key": "Content-Type",
          "value": "application/javascript; charset=utf-8"
        }
      ]
    }
  ]
}