Missing file extensions for multi-line imports

[manzt]

Thank you for your work on this project. It is (nearly) perfect for my use case. I'm authoring a pure ESM library in typescript, so the addition of file extensions to imports is very very nice.

However, I've seemed to find a bug... If import statements are over multiple lines, the file extensions does not seem to be resolved in the output (making the ESM dist incompatible with Node and the browser).

Example

// src/index.ts
import { a } from './a';
import {
  b
} from './b';
export { a, b }

$ mkdist

// dist/index.mjs
import { a } from './a.mjs';
import { 
  b
} from './b'; // <- .mjs missing, breaks ESM
export { a, b }

This is the commit where I changed imports and things started working correctly: manzt/zarrita.js@bd6706a (#29)

[manzt]

It appears this comes from the regex in make.ts:

mkdist/src/make.ts

Line 89 in 01bd971

/(import|export)(.* from ['"])(.*)(['"])/g,

https://regex101.com/r/bLBOuI/1