fix: output esm into "*.mjs" module

[mattcosta7]

Removes legacyOutput option from tsup, in favor the mjs output used without that configuration.

removes unnecessary esm folder and package.json

output of lib with this config (to compare against).

I haven't published/tested node resolution here - this might be helpful before versioning/merging

[mattcosta7]

Tests I did locally

• start a repo with
• install a version of headers-polyfill
• override the package.json based on these changes
• override the built files based on these changes
• install jest
• write a simple test

import { Headers } from 'headers-polyfill'
it('works', () => {
    expect(Headers).toBeDefined()
})

• run jest, without experimental modules flag (using base transform)
• provide an empty transform object in jest config
• run jest, with experimental modules flag.

that all seems to check out, at least using node 16.17.1

without type: module, using

const {Headers} = require('headers-polyfill')
it('works', () => {
    expect(Headers).toBeDefined()
})

seems to work fine

as does a ts file, using tsjest

import { Headers } from 'headers-polyfill'
it('works', () => {
    expect(Headers).toBeDefined()
})

[kettanaito]

This looks great. Thank you @mattcosta7!
I'm glad to be rid of the /esm folder. Let's see the CI status before merging.

[kettanaito]

I love GitHub Actions sometimes

Error: Input required and not supplied: token

[mattcosta7]

I love GitHub Actions sometimes

Error: Input required and not supplied: token

Yeah, I think this is probably because it's a fork, which doesn't have access to repo secrets (iirc)

[mattcosta7]

@kettanaito

https://github.com/mswjs/headers-polyfill/blob/main/.github/workflows/ci.yml#L19

This line in the workflow is the error. Secrets aren't exposed on most actions in forks to avoid users maliciously stealing them

Using pull_request_target events should allow secrets from forks (I believe), but comes with the drawback that the version of the action from the base branch runs instead of the head (so changes need to land or be branch off to validate)

[kettanaito]

Released: v3.1.1 🎉

This has been released in v3.1.1!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i headers-polyfill@latest) to get the newest features and bug fixes.

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