Function enterFocus

e2e/src/timeline.ts:93–101

(
  runDir: string,
  window: TimelineWindow,
  ms?: number,
)

 * focus of a run never beats (nothing to linger on).
 */
export const enterFocus = async (
  runDir: string,
  window: TimelineWindow,
  ms?: number,
): Promise<void> => {
  const previous = read(runDir).focus.at(-1)?.window;
  if (previous !== undefined && previous !== window) await beat(ms);
  markFocus(runDir, window);
};