Function evaluateMotion

packages/cli/src/utils/motionAudit.ts:215–237

(
  frames: MotionFrame[],
  assertions: MotionAssertion[],
  canvas: Canvas,
)

 * inspect's existing dedupe/collapse/limit/format pipeline.
 */
export function evaluateMotion(
  frames: MotionFrame[],
  assertions: MotionAssertion[],
  canvas: Canvas,
): LayoutIssue[] {
  if (frames.length === 0) return [];
  return assertions.flatMap((assertion) => {
    switch (assertion.kind) {
      case "appearsBy":
        return appearsBy(frames, assertion.selector, assertion.bySec);
      case "before":
        return before(frames, assertion.a, assertion.b);
      case "staysInFrame":
        return staysInFrame(frames, assertion.selector, canvas);
      case "keepsMoving":
        return keepsMoving(
          frames,
          assertion.withinSelector,
          assertion.maxStaticSec ?? DEFAULT_MAX_STATIC_SEC,
        );
    }
  });
}

/**
 * Selectors and liveness scopes the in-page sampler must read for a spec.