Генерирует файл с путями ко всем файлам с указанными расширениями. Удобно, когда добавляешь линтер в большой проект.

generateEslintignore.js

const mainFolder = './';
const mainExtensions = ['.js'];
const mainExcludeDirectories = ['node_modules'];

const fs = require('fs');

async function isDirectory(path) {
	return new Promise((res, rej) => {
		fs.stat(path, (error, stats) => {
			if (error) {
				rej(error);
			}

			res(stats.isDirectory());
		});
	});
}

async function getFilePaths(folder, extensions, excludeDirectories) {
	if (excludeDirectories.some(dir => folder.includes(dir))) {
		return [];
	}

	const filePaths = [];
	const promises = fs.readdirSync(folder).map(
		name =>
			new Promise((res, rej) => {
				const pathToCheck = `${folder}${name}`;

				isDirectory(pathToCheck)
					.then(async isDir => {
						if (isDir) {
							const nextDirectory = `${pathToCheck}/`;
							const filesFromNextDirectory = await getFilePaths(
								nextDirectory,
								extensions,
								excludeDirectories,
							);
							filePaths.push(...filesFromNextDirectory);
							res();
						}

						if (extensions.some(ext => name.endsWith(ext))) {
							const fullFilePath = `${folder}${name}`;
							filePaths.push(fullFilePath);
						}
						res();
					})
					.catch(error => {
						rej(error);
					});
			}),
	);

	await Promise.all(promises);

	return filePaths;
}

async function writeFilePaths(fileName) {
	try {
		const resultPaths = (await getFilePaths(mainFolder, mainExtensions, mainExcludeDirectories)).map(el =>
			el.replace('./', '/'),
		);

		fs.writeFileSync(fileName, resultPaths.join('\n'));
	} catch (error) {
		fs.writeFileSync(fileName, `${error}`);
	}
}

writeFilePaths('.eslintignore');