perf(animations): Remove generic objects in favor of Maps by jessicajaniuk · Pull Request #44482 · angular/angular

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

We were using a number of generic objects as if they were maps and relying on delete to remove
properties.

Issue Number: N/A

What is the new behavior?

In order to improve performance, these generic objects have been switched to native maps.

Does this PR introduce a breaking change?

• Yes
• No