Function runContrastAudit

packages/cli/src/commands/validate.ts:144–168

(page: import("puppeteer-core").Page)

}

async function runContrastAudit(page: import("puppeteer-core").Page): Promise<ContrastEntry[]> {
  const duration = await getCompositionDuration(page);
  if (duration <= 0) return [];

  await page.addScriptTag({ content: loadContrastAuditScript() });

  const results: ContrastEntry[] = [];
  for (let i = 0; i < CONTRAST_SAMPLES; i++) {
    const t = +(((i + 0.5) / CONTRAST_SAMPLES) * duration).toFixed(3);
    await seekTo(page, t);

    const screenshot = (await page.screenshot({ encoding: "base64", type: "png" })) as string;
    const entries = await page.evaluate(
      (b64: string, time: number) =>
        typeof (window as unknown as Record<string, unknown>).__contrastAudit === "function"
          ? ((window as unknown as Record<string, unknown>).__contrastAudit as Function)(b64, time)
          : [],
      screenshot,
      t,
    );
    results.push(...(entries as ContrastEntry[]));
  }

  return results;
}

function loadContrastAuditScript(): string {
  const candidates = [