Migrate from cjs to esm

[viceice]

What would you like Renovate to be able to do?
As more and more dependencies are only available as esm we should also start transitioning to esm.

Full esm is supported since node v12.22, v14 has no stable esm

Did you already have any implementation ideas?

1. First start publishing renovate as cjs and esm, so downstream projects can start testing esm too.
2. Remove cjs from renovate

Blocker

• feat(runtime): add jest.mockModule jestjs/jest#10976

[viceice]

https://nodejs.org/api/esm.html#esm_modules_ecmascript_modules

v14.0.0

• ECMAScript Modules - Experimental Warning Removal
  https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V14.md#ecmascript-modules---experimental-warning-removal

[viceice]

v14 is esm stable too, but docs update not yet released. So will probably come with v14.17.0.

ref: nodejs/node#38409 nodejs/node#38480 nodejs/node#37719 nodejs/node#35781 nodejs/node@c1af593

[thernstig]

Full esm is supported since node v12.22, v14 has no stable esm

I just happened to stumble upon this, and wanted to be a nice citizen 😄

v14 does have stable ESM support, that is just a bug in the docs. See nodejs/node#38409

[voxpelli]

Was this solved by #9887 or additional work needed? Found some comments in #11133 around ESM that confused me. Is ESM modules considered not usable by Renovate yet or?

[viceice]

See description of issue, this is blocked by jest issue.

[HonkingGoose]

@viceice would having this in Jest be enough to get us going?

jestjs/jest#11818

[viceice]

@viceice would having this in Jest be enough to get us going?

facebook/jest#11818

I don't think so, it's very basic and experimental. Lets wait for more stabillity.

[rarkins]

Blocked by #13181