attest

The pure-Dart core of the attest accessibility-compliance toolkit for Flutter: the data model, the rule engine, the tree-walking rules, report aggregation and baseline diffing.

Honest framing. Automated checks catch roughly 30–40% of accessibility issues. This package provides automated coverage of machine-checkable criteria plus a structured checklist for the rest. It does not certify "EAA compliance."

This package has no Flutter dependency. Every rule is a pure function over a serializable SemanticsSnapshot, which makes rules fast and exhaustively unit-testable. The Flutter-facing helpers (the WidgetTester extension and the raster/text-scale collectors) live in attest_flutter.

Standard packs

Audits run against a versioned pack, chosen with RuleConfig.standard:

• Standard.en301549_v3_2_1 (default) — WCAG 2.1 Level AA, the current EU legal baseline.
• Standard.wcag22 — WCAG 2.2 Level AA, the basis for the forthcoming EN 301 549 v4.1.1.

A rule runs only when its cited criterion belongs to the selected pack, so switching packs changes both the checks that run and the criteria cited. For example attest/target-size (WCAG 2.5.8) is new in 2.2, so it is inactive under the default en301549_v3_2_1 pack and active under wcag22.

Migrating to WCAG 2.2: set standard: Standard.wcag22, then re-run attest baseline --update — the newly active rules may add findings you will want to review and accept.

Status

Early development. The public API is not yet stable.

License

BSD-3-Clause.