--- /dev/null
+'use strict';
+const path = require('path');
+const pathType = require('path-type');
+
+const getExtensions = extensions => extensions.length > 1 ? `{${extensions.join(',')}}` : extensions[0];
+
+const getPath = (filepath, cwd) => {
+ const pth = filepath[0] === '!' ? filepath.slice(1) : filepath;
+ return path.isAbsolute(pth) ? pth : path.join(cwd, pth);
+};
+
+const addExtensions = (file, extensions) => {
+ if (path.extname(file)) {
+ return `**/${file}`;
+ }
+
+ return `**/${file}.${getExtensions(extensions)}`;
+};
+
+const getGlob = (dir, opts) => {
+ if (opts.files && !Array.isArray(opts.files)) {
+ throw new TypeError(`Expected \`files\` to be of type \`Array\` but received type \`${typeof opts.files}\``);
+ }
+
+ if (opts.extensions && !Array.isArray(opts.extensions)) {
+ throw new TypeError(`Expected \`extensions\` to be of type \`Array\` but received type \`${typeof opts.extensions}\``);
+ }
+
+ if (opts.files && opts.extensions) {
+ return opts.files.map(x => path.join(dir, addExtensions(x, opts.extensions)));
+ }
+
+ if (opts.files) {
+ return opts.files.map(x => path.join(dir, `**/${x}`));
+ }
+
+ if (opts.extensions) {
+ return [path.join(dir, `**/*.${getExtensions(opts.extensions)}`)];
+ }
+
+ return [path.join(dir, '**')];
+};
+
+module.exports = (input, opts) => {
+ opts = Object.assign({cwd: process.cwd()}, opts);
+
+ if (typeof opts.cwd !== 'string') {
+ return Promise.reject(new TypeError(`Expected \`cwd\` to be of type \`string\` but received type \`${typeof opts.cwd}\``));
+ }
+
+ return Promise.all([].concat(input).map(x => pathType.dir(getPath(x, opts.cwd))
+ .then(isDir => isDir ? getGlob(x, opts) : x)))
+ .then(globs => [].concat.apply([], globs));
+};
+
+module.exports.sync = (input, opts) => {
+ opts = Object.assign({cwd: process.cwd()}, opts);
+
+ if (typeof opts.cwd !== 'string') {
+ throw new TypeError(`Expected \`cwd\` to be of type \`string\` but received type \`${typeof opts.cwd}\``);
+ }
+
+ const globs = [].concat(input).map(x => pathType.dirSync(getPath(x, opts.cwd)) ? getGlob(x, opts) : x);
+ return [].concat.apply([], globs);
+};