Add default gatherer replacement doc example about lighthouse HOT 3 OPEN

https://github.com/dequelabs/axe-core/blob/develop/lib/checks/aria/aria-prohibited-attr-evaluate.js

The check uses the standards object, which can be overriden via axe.configure({standards}) to provide your own role.

On the Lighthouse side, we don't have any way to pass options to gatherers (mentioned in #10247), so the only way to utilize your own axe configuration today is to create a custom Lighthouse config with your own Accessibility gatherer. I don't know if we have an example of what that would look like - @adamraine do we?

from lighthouse.

Oooh, this is quite useful! An example as to where I might be able to inject that would be super help. Many thanks, in advance 🙇🏼

from lighthouse.

I don't know if we have an example of what that would look like - @adamraine do we?

We don't have an example of replacing a default gatherer with a custom one, although such an example would be useful for use cases like this.

Here is a quick example config file that replaces the gatherer with one that throws an error:

import {Gatherer} from 'lighthouse';

class CustomAccessibility extends Gatherer {
  meta = {
    supportedModes: ['navigation'],
  };

  getArtifact() {
    throw new Error('Test');
  }
}

/** @type {import('lighthouse').Config} */
const config = {
  extends: 'lighthouse:default',
  artifacts: [
    {id: 'Accessibility', gatherer: CustomAccessibility},
  ],
};

export default config;

from lighthouse.