typings: Consider using PromiseLike instead of Promise

[unional]

Using the global Promise causes incompatibility error:
unional#1

Using PromiseLike should solve this problem.

[jamestalmage]

See microsoft/TypeScript#5911

It seems to suggest that Promise must be used for async functions. We definitely want to allow async functions, so not sure this is a good idea.

@SamVerschueren @ivogabe

[unional]

An alternative would be using any-promise. Since it includes its typings and does not have any dependencies, it should work too.
You can try it out with the changes I made:

I add any-promise and solve the issue:
https://github.com/unional/ava/blob/master/index.d.ts#L1
https://github.com/unional/ava/blob/master/package.json#L80

[unional]

es6-promise would also be possible (and likely a better option) once this is landed:
stefanpenner/es6-promise#211

[ivogabe]

PromiseLike would work, there's no need to add another dependency for it.

@jamestalmage That only applies when you annotate an async function with a return type. Promise<T> is assignable to PromiseLike<T>, so you can still use async functions after this change.

[sindresorhus]

Fixed by 1dd6d5b.

[unional]

Great! Thanks.

I'm working on ava-fixture in typescript that runs file-based tests (and baseline tests in the future). It would benefit from the updated typings.

Are you planning to do a release soon?