Promise.prototype.finally (https://github.com/tc39/proposal-promise-finally) is now at [stage 3](https://tc39.github.io/proposal-promise-finally/) This issue is created to handle the addition of the corresponding definition. This has been suggested by @mhegazy https://github.com/Microsoft/TypeScript/pull/20385#issuecomment-348713869
Promise.prototype.finally (https://github.com/tc39/proposal-promise-finally) is now at stage 3
This issue is created to handle the addition of the corresponding definition.
This has been suggested by @mhegazy #20385 (comment)