Add types reference also to the exports part to fix #1629

[ulrichb]

Description / Type of change

Bugfix for #1629

See https://www.typescriptlang.org/docs/handbook/esm-node.html#packagejson-exports-imports-and-self-referencing for the TypeScript docs of the used exports change.

Note that I didn't change the "./types" exports entry because this seems to be only a workaround for some ESLint error, see 8ddeba2.

How Has This Been Tested?

When running npx tsc -p . in the repro sample (see #1629 (comment)) before the fix:

$npx tsc -p .
test.ts:1:27 - error TS7016: Could not find a declaration file for module 'telegraf'. 'C:/_work/3rdP/telegraf/lib/index.js' implicitly has an 'any' type.
  Try `npm i --save-dev @types/telegraf` if it exists or add a new declaration (.d.ts) file containing `declare module 'telegraf';`

1 import * as telegraf from "telegraf"
                            ~~~~~~~~~~


Found 1 error in test.ts:1

... and after the fix it compiles fine.

Checklist:

• I have performed a self-review of my own code
• n/a I have made corresponding changes to the documentation
• n/a My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
  • Nope only a manual test, see above

[MKRhere]

Does this continue working with current target modules that are not Node16 / NodeNext? And does this increase required TS version to 4.7.2? If so, is there a backwards-compatible way to make this change?

[ulrichb]

@MKRhere Very good question! As I've understood the docs, in "module": "commonjs" mode the exports field isn't used at all (instead the "older" top-level main and types is used). And therefore it should be backwards compatible.

But to go 100% sure, I've tested this PR change also with "module": "commonjs" with TS 3.9, 4.2, and 4.7 and it works fine 🙌.

[wojpawlik]

Consider adding "./scenes".

[MKRhere]

I didn't change the "./types" exports

Hope you don't mind that I went ahead and added this so we can unblock the PR. Thanks for the effort, cheers!

[ulrichb]

@MKRhere Many thanks!