Fix typescript types for ESM import

[EzraBrooks]

Fixes another one of the issues reported by "Are The Types Wrong?":

Before:

After:

[EzraBrooks]

The closer I look at this, the more I don't understand what the tool is upset about, frankly. I don't know that we should merge this just to satisfy the tool if the tool is potentially wrong.

[EzraBrooks]

ok I figured it out. index.d.ts was not aligned with the structure of index.js and there was no corresponding .mts file that aligned with the structure of index.mjs.

Fixed and now we're all green:

[EzraBrooks]

Removing this allows TypeScript to resolve the types file automagically based on extension substitution from the chosen entrypoint, apparently.

[EzraBrooks]

as it turns out, the issues reported by this tool actually have nothing to do with #277, lol.

[lpinca]

Does this work with old versions of TypeScript?

[EzraBrooks]

Looks like support for .d.mts was added in TypeScript 4.7 in May 2022

[lpinca]

Thank you.

[cyfung1031]

Thank you.

Good to see that this repo is still being maintained by someone.
(The previous commit was 2 years ago)

[TiMESPLiNTER]

Any chance we can get a release including this merged fix @lpinca ?

Without I'm currently forced to either install it from master branch or

import type {EventEmitter as EventEmitter} from "eventemitter3";