Advanced audit configuration

Dual filtering

Rules and Outcomes filters can of course be combined:

import { Audit, Outcomes, Rules } from "@siteimprove/alfa-test-utils";

const alfaResult = await Audit.run(alfaPage, {
  rules: { include: Rules.aaFilter, exclude: Rules.cherryPickFilter(69) },
  outcomes: { include: Outcomes.insideSelectorFilter("nav.global") },
});

Combining filters

Rule filters (typically) can also be combined with the predicate combinators of the @siteimprove/alfa-predicate package:

import { Predicate } from "@siteimprove/alfa-predicate";
import { Audit, Outcomes, Rules } from "@siteimprove/alfa-test-utils";

const { and } = Predicate;

const alfaResult = await Audit.run(alfaPage, {
  rules: { include: and(Rules.aaFilter, Rules.componentFilter) },
});

This will only select the level A and AA rules that are also 'component' rules.

Tip: Predicates are simply functions returning a boolean and can also be combined manually, e.g. rule => Rules.aaFilter(rule) && Rules.componentFilter(rule) would achieve the same result as the and combinator.

More configuration

Check the technical documentation of the Audit.Option object for details. See also which rules filters and outcomes filters are pre-built and can be used. It is possible to use custom filters for both rules and outcomes, and to write custom rules and add them to the audit (or replace the existing ones). We currently do not have a guide for these.

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