Passing additional parameters to listeners

[buschtoens]

As suggested by @pzuraq on Discord.

Action Parameters:

You can optionally pass arguments to the action handler. Any values passed to the {{action}} helper after the action name will be passed to the handler as arguments.

So for us this means:

<button {{on "click" this.onClick "foo" "bar"}}>Click me</button>

export default class extends Component {
  @action
  onClick(foo: string, bar: string, event: MouseEvent) {
    console.log({ foo, bar, event }); // => { foo: "foo", bar: "bar", event: Event { ... } }
  }
}

This will make the transition from {{action}} to {{on}} much easier.