ES6 module support in Chrome 62/Chrome Canary 64, does not work locally, CORS error
Index.html
<html>
<head>
<script type="module">
import {answer} from './code.js'
console.info("It's ${answer()} time!")
</script>
</head>
<body>
</body>
</html>
code.js
export function answer(){
return 'module';
}
Error: Access to Script at 'file:///C:*******/es6/code.js' from origin 'null' has been blocked by CORS policy: Invalid response. Origin 'null' is therefore not allowed access.
Chrome says it can support modules and I have seen examples working on the web, but when I copy them of download and run them locally, I always get the error above. I do not want to use Babel, Webpack, etc.
I have tried enabling the Experimental Web Platform features flag in both Chrome and Chrome Canary.
Answer
Unlike regular scripts, ES6 modules are subject to same-origin policy. This means that you cannot import them from the file system or cross-origin without a CORS header (which cannot be set for local files).
Basically you need to run this code from a (local) server or disable same-origin in the browser for testing (do not do this permanently). See: Access to Image from origin 'null' has been blocked by CORS policy.