| ⇢ | A | lib/concurrent/CancellationToken.js added |
| ⇢ | B | CancellationToken.js ➔ CancellationToken added | |
| ⇢ | A | CancellationToken.js ➔ ... ➔ this.cancel added | |
| ⇢ | A | CancellationToken.js ➔ ... ➔ this.isCancelled added | |
| ⇢ | A | CancellationToken.js ➔ ... ➔ this.addDependency added |