Typings resolution error with TS 4.7 in "Node16" mode

[ulrichb]

Context

• Telegraf.js Version: 4.8.2
• Node.js Version: 16
• Operating System: Win

Minimal Example Code Reproducing the Issue

import * as telegraf from "telegraf";

With the (as of TS 4.7) released "native Node ESM module" support (activated via"module": "node16") all "telegraf" imports fail with "Could not find a declaration file for module 'telegraf'".

This is because in this mode TSC prefers the "exports" declaration in telegraf's package.json (and ignores the top-level "types": "./typings/index.d.ts"). See this answer from the TS team.

When locally changing "exports": { ".":"./lib/index.js" } to "exports": { ".": { "require": "./lib/index.js", "types": "./typings/index.d.ts" } } the error disappears. This is also documented here: https://www.typescriptlang.org/docs/handbook/esm-node.html

Should I propose a PR with this fix?

[MKRhere]

Should I propose a PR with this fix?

Yes! PR welcome :)

[ulrichb]

Repro sample (used in the following PR): telegraf1629repro.zip

[mees-]

Telegraf is currently the only library keeping me from fully converting to ESM. I really appreciate the effort! 😁