fix: add "package.json" and types to exports for all packages

[saibotsivad]

From #467 this adds the "./package.json": "./package.json" to all packages/*/package.json files.

For posterity, here's the script I used:

// add-package-json.mjs
import { readdir, readFile, writeFile } from 'node:fs/promises'
import { join } from 'node:path'
const ROOT = 'packages'
const dirs = await readdir(ROOT)
for (const dir of dirs) {
	const filepath = join(ROOT, dir, 'package.json')
	const pkg = JSON.parse(await readFile(filepath))
	pkg.exports['./package.json'] = './package.json'
	writeFile(filepath, JSON.stringify(pkg, undefined, 2), 'utf8')
}

The results are pretty straightforward.

[saibotsivad]

Oh hey, I just noticed the discussion in 429 about adding types to the export.

I've added an additional commit to add the types property to all packages, this will close #483 as well.

For posterity, that script looks like this (very similar to the above):

// add-types.mjs
import { readdir, readFile, writeFile } from 'node:fs/promises'
import { join } from 'node:path'
const ROOT = 'packages'
const dirs = await readdir(ROOT)
for (const dir of dirs) {
	// test that there is a types file in all packages, will throw if not found
	await readFile(join(ROOT, dir, 'index.d.ts'), 'utf8')
	const filepath = join(ROOT, dir, 'package.json')
	const pkg = JSON.parse(await readFile(filepath))
	pkg.exports['.'].types = './index.d.ts'
	writeFile(filepath, JSON.stringify(pkg, undefined, 2), 'utf8')
}

[angus-c]

This is great—much appreciated!!