utils.js

// https://github.com/sveltejs/svelte.dev//blob/main/apps/svelte.dev/src/routes/(authed)/playground/%5Bid%5D/gzip.js#L1-L17

/** @param {string} input */
export async function compress_and_encode_text(input) {
	const reader = new Blob([input]).stream().pipeThrough(new CompressionStream('gzip')).getReader()
	let buffer = ''
	for (;;) {
		const { done, value } = await reader.read()
		if (done) {
			reader.releaseLock()
			return btoa(buffer).replaceAll('+', '-').replaceAll('/', '_')
		} else {
			for (let i = 0; i < value.length; i++) {
				// decoding as utf-8 will make btoa reject the string
				buffer += String.fromCharCode(value[i])
			}
		}
	}
}