sveltesociety.dev/scripts/tarball.js

// @ts-check
// Source: https://github.com/bluwy/publint/blob/master/site/src/utils/tarball.js

/** @typedef {{ name: string, buffer: ArrayBuffer }} TarballFile */

/**
 * @param {TarballFile[]} files
 * @return {import('publint').Vfs}
 * */
export function createTarballVfs(files) {
	return {
		getDirName: (path) => path.replace(/\/[^/]*$/, ''),
		getExtName: (path) => path.replace(/^.*\./, '.'),
		isPathDir: async (path) => {
			path = path.endsWith('/') ? path : path + '/';
			return files.some((file) => file.name.startsWith(path));
		},
		isPathExist: async (path) => {
			const pathDirVariant = path.endsWith('/') ? path : path + '/';
			return files.some((file) => file.name === path || file.name.startsWith(pathDirVariant));
		},
		pathJoin: (...parts) =>
			parts
				.map((v) => (v.startsWith('./') ? v.slice(2) : v))
				.join('/')
				.replace('///', '/')
				.replace('//', '/'), // TODO: optimize this please
		pathRelative: (from, to) => to.replace(from, '').slice(1),
		readDir: async (path) => {
			path = path.endsWith('/') ? path : path + '/';
			return files
				.filter((file) => file.name.startsWith(path) && file.name !== path)
				.map((file) => file.name.slice(path.length));
		},
		readFile: async (path) => {
			const file = files.find((file) => file.name === path);
			if (file) {
				return new TextDecoder('utf-8').decode(file.buffer);
			} else {
				throw new Error(`Unable to read file at path: ${path}`);
			}
		}
	};
}