add a type definition to the package

[mh-alahdadian]

hello

I know that there is already a typescript type definition for this package in @types/core-js but many packages are trying to make a type definition inside of they're packages which has benefits like always sync to the package version and doesn't need to install it separately

can you add a type definition into this repo ? and I'm interested to do it if you want

[nicolo-ribaudo]

Since core-js matches the JavaScript API, doesn't TypeScript support them out of the box?

[mh-alahdadian]

it doesn't match completely , it have some proposal functions that not in the typescript lib, and also some interfaces like Dict which are not in pure js

[zloirock]

@nicolo-ribaudo you're right, but only about stable JS and global polyfills. core-js contains also polyfills for early-stage proposals which haven't any standard type definitions and entry points for the version without global pollution. Type definitions for them could be useful.

@mha15 Dict and other non-standard features removed from core-js@3.

Feel free to add a PR.

[zloirock]

https://github.com/Kingwl/core-dts

[zloirock]

Type definitions for core-js-builder added in 3.28.0.