fix(animations): ensure the web-animations driver properly handles empty keyframes (#20648)

Closes #15858 PR Close #20648
2017-11-27 14:40:09 -08:00
parent 10771d0bd8
commit c26e1bba1d
2 changed files with 19 additions and 1 deletions
--- a/packages/animations/browser/src/render/web_animations/web_animations_player.ts
+++ b/packages/animations/browser/src/render/web_animations/web_animations_player.ts
@ -65,7 +65,7 @@ export class WebAnimationsPlayer implements AnimationPlayer {

    const keyframes = this.keyframes.map(styles => copyStyles(styles, false));
    const previousStyleProps = Object.keys(this.previousStyles);
-    if (previousStyleProps.length) {
+    if (previousStyleProps.length && keyframes.length) {
      let startingKeyframe = keyframes[0];
      let missingStyleProps: string[] = [];
      previousStyleProps.forEach(prop => {