Function firstAppear

packages/cli/src/utils/motionAudit.ts:55–66

First frame where the selector is visible at/above the appear threshold.

(
  frames: MotionFrame[],
  selector: string,
)

/** First frame where the selector is visible at/above the appear threshold. */
function firstAppear(
  frames: MotionFrame[],
  selector: string,
): { time: number; rect: LayoutRect } | null {
  for (const frame of frames) {
    const sample = frame.data[selector];
    if (sample && sample.visible && sample.opacity >= APPEAR_OPACITY) {
      return { time: frame.time, rect: sample.rect };
    }
  }
  return null;
}

function missingIssue(selector: string, time: number): LayoutIssue {
  return {