ES6 class support

[matthewmueller]

Hey @dop251, thanks for all your hard work on Goja. I'm especially grateful for the recent Promise API support.

Goja is really close to being ready to natively run what ESBuild outputs to ES6 via esbuild --target=es2015 <entry...>.

One thing that's missing is class support:

class A extends B {
  constructor() {
     super()
  }
}

I was actually surprised to see that class support came in ES6, but I had a look at the ES6 support table and it looks like it's there.

For my use-case, I'm trying to render Svelte code on the server-side, but the compiler generates classes:

var SvelteElement
if (typeof HTMLElement === "function") {
  SvelteElement = class extends HTMLElement {
    constructor() {
      super()
      this.attachShadow({ mode: "open" })
    }
    // ...
}

[dzonerzy]

Thanks for all your hard work first of all! do we have an eta for the es6 support?

[arukiidou]

@dzonerzy
He says that,

I will be adding features in their dependency order and as quickly as time permits. Please do not ask for ETAs.

[dop251]

I can only say it's next on my list. It's no small feat and I also want to implement private fields so that I don't have to return to it (and potentially do a complete rewrite).