Support es modules

[belgattitude]

Do not merge yet. I'd like to add more ci tests. Dual packaging is hard when going into details.

Rework publishing iteration 1.

• Add es module exports.
• Keep dual packaging (and packaging hazards that comes along)
• Decrease size-limits to account for new peer-deps (treeshakes)

Why ?

It paves the way to:

• Avoid duplicates instances of react-i18next in some situations (at least in the long run and esm only)
• Prepare a shift to esm only. Warning: recent nextjs will work, not older ones. Jest is almost there, but there's probably a lot of old installs. So I'll try to keep a conservative approach
• Explicitly declare subpaths

Version

Minor version. Should not break anything.

Risks

Dual packaging is always tricky. There's risks to add the exports field. Out of my mind (not exhaustive):

• Typescript (< 4.9) still have issues when dealing with types and subpaths exports (like serverSideProps). Fixed by typeConfig
• Older webpack consider the non-standard 'import' field (rather than modules), so I kept it there with comment

Next iterations

I'll detail soon. But I see a lot of potential for either size-reduction, either normalization. Other packages i18next, react-i18next will have to be updated too to bring full potential.

Size history

Before:

Route (pages)                              Size     First Load JS
┌ ● /                                      1.08 kB        97.9 kB
├   /_app                                  0 B            94.6 kB
├ ○ /[40](https://github.com/i18next/next-i18next/actions/runs/3330057611/jobs/5508051889#step:8:41)4                                   181 B          94.8 kB
└ λ /second-page                           799 B          97.7 kB
+ First Load JS shared by all              94.6 kB
  ├ chunks/framework-3b5a00d5d7e8d93b.js   [45](https://github.com/i18next/next-i18next/actions/runs/3330057611/jobs/5508051889#step:8:46).4 kB
  ├ chunks/main-2b5cf5964c9408ce.js        26.5 kB
  ├ chunks/pages/_app-6e90689c67c1aa69.js  22 kB
  └ chunks/webpack-8fa1640cc84ba8fe.js     750 B

After:

Route (pages)                              Size     First Load JS
┌ ● /                                      1.08 kB        97.9 kB
├   /_app                                  0 B            94.6 kB
├ ○ /[40](https://github.com/i18next/next-i18next/actions/runs/3330057611/jobs/5508051889#step:8:41)4                                   181 B          94.8 kB
└ λ /second-page                           799 B          97.7 kB
+ First Load JS shared by all              94.6 kB
  ├ chunks/framework-3b5a00d5d7e8d93b.js   [45](https://github.com/i18next/next-i18next/actions/runs/3330057611/jobs/5508051889#step:8:46).4 kB
  ├ chunks/main-2b5cf5964c9408ce.js        26.5 kB
  ├ chunks/pages/_app-6e90689c67c1aa69.js  22 kB
  └ chunks/webpack-8fa1640cc84ba8fe.js     750 B

No regressions

[socket-security]

Socket Security Pull Request Report

👍 No new dependency issues detected in pull request

Pull request report summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Non-existent author	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[belgattitude]

Not stale

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.