Add support to proper augment PluginOptions type

[pedrodurek]

This is the first PR that solves this problem: #1578
Another one will be created under i18next-locize-backend that depends on this.

It should have no breaking changes to users.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• documentation is changed or added

[coveralls]

Coverage remained the same at 93.057% when pulling 4bbbced on pedrodurek:master into a6e09e3 on i18next:master.

[adrai]

Would also other backends need to be updated?
like:

• https://github.com/i18next/i18next-http-backend
• https://github.com/i18next/i18next-fs-backend
• ...

or other plugins like: https://github.com/i18next/i18next-browser-languageDetector ?

[pedrodurek]

I'm going to take a look at the other repos.

[pedrodurek]

Hey @adrai, let me know if there any remaining plugins.

[adrai]

Thank you for your help.
There probably are others... but if this is all there is to do... it's doable 😉

hope @jamuhl can have a look at it so we can create the appropriate releases...

If I've understood correctly this should not be breaking for neighter i18next nor the plugins, right?

[pedrodurek]

No problem!!! Yeah, it should have no breaking changes on both sides

[mrrotberry]

@pedrodurek , hmm, looks like you broke support of i18next-chained-backend, library for combine multiple of the existing backends( I'm talking about such a case:

i18nextInstance
  .use(I18NextChainedBackend)
  .init({
    backend: process.env.NODE_ENV === 'production'
      ? {
          backends: [LocalStorageBackend, I18NextHttpBackend],
          backendOptions: [localStorageBackendConfig, httpBackendConfig],
        }
      : {
          backends: [I18NextHttpBackend],
          backendOptions: [httpBackendConfig],
        },
    });

[pedrodurek]

Hey @mrrotberry, yeah, It was reported yesterday, I'm on it! 😃

[mrrotberry]

OK, sorry didn't see 😃 could you tell me where this issue was discussed and where I could keep track of it?)

[pedrodurek]

Sure! i18next/i18next-http-backend#58

[mrrotberry]

thank you very much and have a nice day)

[adrai]

@mrrotberry should be fixed with the new i18next-chained-backend version

[mrrotberry]

@adrai I confirm, the typing works fine, there are no errors. Thank you very much 👍

[adrai]

You have to thank @pedrodurek
he is the master of TypeScript 😉