Switch NPM package to support only ESM

[IvanGoncharov]

As disscussed during graphql-js-wg:
https://github.com/graphql/graphql-js-wg/blob/main/agendas/2022-03-30.md

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[saihaj]

@IvanGoncharov what about #3361 ?

[IvanGoncharov]

@IvanGoncharov what about #3361 ?

@saihaj As we agreed, let's try with full ESM first, and if the community strongly asks for CJS we can go the #3361 approach with dual packages.

[saihaj]

@IvanGoncharov what about #3361 ?

@saihaj As we agreed, let's try with full ESM first, and if the community strongly asks for CJS we can go the #3361 approach with dual packages.

I mean the work was already done there and we just need to that esm only package under main graphql npm

[IvanGoncharov]

I mean the work was already done there and we just need to that esm only package under main graphql npm

@saihaj Can't do that, benchmark and integration tests need to use ESM, it's the absolute majority of changes in this PR.
#3361 don't do that.

[saihaj]

I mean the work was already done there and we just need to that esm only package under main graphql npm

@saihaj Can't do that, benchmark and integration tests need to use ESM, it's the absolute majority of changes in this PR. #3361 don't do that.

@IvanGoncharov we have tests in that PR

[saihaj]

ok but we can just push a commit on initial work done there and wait for @graphql/graphql-js-reviewers team for review