index.js

'use strict';
const path = require('path');
const locatePath = require('locate-path');
const pathExists = require('path-exists');

const stop = Symbol('findUp.stop');

module.exports = async (name, options = {}) => {
	let directory = path.resolve(options.cwd || '');
	const {root} = path.parse(directory);
	const paths = [].concat(name);

	const runMatcher = async locateOptions => {
		if (typeof name !== 'function') {
			return locatePath(paths, locateOptions);
		}

		const foundPath = await name(locateOptions.cwd);
		if (typeof foundPath === 'string') {
			return locatePath([foundPath], locateOptions);
		}

		return foundPath;
	};

	// eslint-disable-next-line no-constant-condition
	while (true) {
		// eslint-disable-next-line no-await-in-loop
		const foundPath = await runMatcher({...options, cwd: directory});

		if (foundPath === stop) {
			return;
		}

		if (foundPath) {
			return path.resolve(directory, foundPath);
		}

		if (directory === root) {
			return;
		}

		directory = path.dirname(directory);
	}
};

module.exports.sync = (name, options = {}) => {
	let directory = path.resolve(options.cwd || '');
	const {root} = path.parse(directory);
	const paths = [].concat(name);

	const runMatcher = locateOptions => {
		if (typeof name !== 'function') {
			return locatePath.sync(paths, locateOptions);
		}

		const foundPath = name(locateOptions.cwd);
		if (typeof foundPath === 'string') {
			return locatePath.sync([foundPath], locateOptions);
		}

		return foundPath;
	};

	// eslint-disable-next-line no-constant-condition
	while (true) {
		const foundPath = runMatcher({...options, cwd: directory});

		if (foundPath === stop) {
			return;
		}

		if (foundPath) {
			return path.resolve(directory, foundPath);
		}

		if (directory === root) {
			return;
		}

		directory = path.dirname(directory);
	}
};

module.exports.exists = pathExists;

module.exports.sync.exists = pathExists.sync;

module.exports.stop = stop;