Migrate from Task to cancellable Promise

[kitsonk]

@kitsonk commented on Fri Aug 12 2016

There is now a Stage 1 Proposal to add cancelability to Promise.

We already adjust the native ES6 Promise a bit in core, but we could also adopt the functionality described in the proposal and hope that we can offload this in the future.

This means that Task could be removed and code refactored to use the functionally enhanced Promise.

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@novemberborn commented on Fri Aug 12 2016

The proposal adds new syntax so additional support from the TypeScript compiler may be required.

[kitsonk]

Related to #21

[kitsonk]

There is a proper proposal now, though it is still Stage 1.

[dylans]

Sadly the proposal was withdrawn due to internal disagreement at Google. So it sounds like we'll keep Task.