fix: Add types to the package export map

[demurgos]

Description:

This commit adds types mapping for the package exports. It makes the package compatible with the upcoming node12 module resolution in TypeScript 4.5.0.

BREAKING CHANGE: N/A

Related issue (if exists): #6641

[kwonoj]

Ref original issue's comment #6641 (comment) .

[kwonoj]

I'm going to close this for now based on Typescript Team's decision (https://devblogs.microsoft.com/typescript/announcing-typescript-4-5-rc/#beta-delta) to not include this for the release:

If you try to use these settings in TypeScript 4.5 RC or stable, you’ll receive an error message directing you to use a nightly build instead

We'll eventually try to support latest tsc features as much to align with ecosystem, but given upstream tsc would like to observe things more carefully and it's not availble for general purpose I don't think we can release our package with this at this moment.

[frank-dspeed]

@kwonoj reopen and release this was wrong communicated it did ship it is released @DanielRosenwasser was referencing to the stuff that is listed under concerns not the modes it self sorry for that.

[kwonoj]

Isn't this same as #6802 filed recently?

[frank-dspeed]

@kwonoj your correct and andrew is from the typescript team ok i got confused because the person who created this pull request posted that he did a pull request before and then i reviewed this.

but andrews pull is newer so ok your correct merge #6802 LGTM +1