Typescript - Support const modifier for options and key

[pedrodurek]

Closes #1929, #1950

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

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided
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[coveralls]

coverage: 92.36%. remained the same when pulling 046b7a0 on pedrodurek:typescript/support-const into 549ada8 on i18next:master.

[pedrodurek]

Hey @adrai, in order to support users with typescript 5+ and older versions, I had to place the types in different files, and now we have two versions of the types for t function (t.d.ts, t.v5.d.ts), please review carefully and let me know if you agree with how I split the resources and if you want me to make any changes.

[adrai]

included in 23.4.0

[efstathiosntonas]

Hey folks, after this change I get this:

TS2614: Module  "i18next"  has no exported member  TFunction . Did you mean to use  import TFunction from "i18next"  instead?

[abhi-works]

@pedrodurek @adrai Facing below issues while building with "tsc" after this PR got approved.
node_modules/i18next/index.d.ts:2:34 - error TS2307: Cannot find module 'typescript/helpers' or its corresponding type declarations.

2 import type { $Dictionary } from 'typescript/helpers';
~~~~~~~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:14:8 - error TS2307: Cannot find module 'typescript/options' or its corresponding type declarations.

14 } from 'typescript/options';
~~~~~~~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:16:43 - error TS2307: Cannot find module 'typescript/t' or its corresponding type declarations.

16 import type { KeyPrefix, TFunction } from 'typescript/t';
~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:497:1 - error TS1383: Only named exports may use 'export type'.

497 export type * from 'typescript/options';
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:497:20 - error TS2307: Cannot find module 'typescript/options' or its corresponding type declarations.

497 export type * from 'typescript/options';
~~~~~~~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:498:1 - error TS1383: Only named exports may use 'export type'.

498 export type * from 'typescript/t';
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

node_modules/i18next/index.d.ts:498:20 - error TS2307: Cannot find module 'typescript/t' or its corresponding type declarations.

498 export type * from 'typescript/t';
~~~~~~~~~~~~~~

[adrai]

@efstathiosntonas @abhi-works sorry, please try with v23.4.1

[efstathiosntonas]

@adrai thanks, it works as a charm now.