Attribute Transformers

[jeswin]

Initial discussion at #54

Parts of the discussion are copied below for context:

Initial proposal by @spiffytech

Forgo could allow libraries to implement this if component had a method to modify attributes before they're put onto the DOM. Something like:

function someFunc() {
  transformAttr(name, value, args) {
    if (name.startsWith('on')) {
      return autoRedraw(value, args);
    }
    return value;
  },
  render() {...}
}

Then you could imagine a library exposing this the same way forgo-state accepts a component and returns a component with modified lifecycle methods.

Pair this with wanting click handlers to run inside the component's error boundary and we've got two examples where modifying DOM node attributes is useful.