Function getAnimationDuration

packages/core/src/animation/longest_animation.ts:73–88

(animation: Animation)

/** Gets an animation's total duration, including its delay and playback rate. */
export function getAnimationDuration(animation: Animation): number | undefined {
  const timing = animation.effect?.getTiming();
  if (timing === undefined) return undefined;

  // duration can be a string 'auto' or a number.
  const animationDuration = typeof timing.duration === 'number' ? timing.duration : 0;
  let duration = (timing.delay ?? 0) + animationDuration;

  // Account for playback rate if it is set.
  const playbackRate = animation.playbackRate;
  if (playbackRate !== undefined && playbackRate !== 0 && playbackRate !== 1) {
    duration /= Math.abs(playbackRate);
  }

  return duration;
}

/**
 * Determines the longest animation, but with `getComputedStyles` instead of `getAnimations`. This