Add tests

[FedericoBiccheddu]

Add tests

[n1ru4l]

I think it also makes sense to test the TypeScript API of this library

[FedericoBiccheddu]

I agree! I've never tested TS types, but can try.

dtslint seems to be a valid option.

Can you help me? 😄

[n1ru4l]

If you are writing the library in TypeScript, don't use dtslint (https://github.com/microsoft/dtslint#setup)

I think it makes more sense to use the options built into the typescript compiler: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-9.html#-ts-expect-error-comments

For an example see: https://github.com/sikanhe/gqtx/pull/12/files#diff-8d994fbf3724bd6655cf9e633fceced3

Also having TypesCript 3.9.3 as a development dependency in this project does not require consumers using TypeScript version 3.9.3 (regarding your comment #12 (comment))

[FedericoBiccheddu]

I'm working again on this issue.

I'd like focus exclusively in testing output types because of my lack of experience in testing types.