walk through a directory recursively, return all the files, filter supported

walk.js

const fse = require('fs-extra');
const path = require('path');

const isNotDot = (filepath) => {
    const REG = /^\..+/i;
    return !REG.test(filepath);
};

/**
 * calculate the relative path from `start` to `end`
 * @param {String} start starting filepath
 * @param {String} end ending filepath
 * @returns {String}
 */
function relativePath(start, end) {
    return path.relative(start, end);
}


/**
 * walk a directory to get a flatterned array of files
 * @param {string} dir The directory path
 * @param {{filter: Function, skipDot: boolean}} p the relative path origin
 * @returns {Array<{ purename, fullpath }>}
 */
function walk(dir, opt) {
    let children = fse.readdirSync(dir);
    const skipDot = opt.skipDot || true;
    if (skipDot) {
        children = children.filter(isNotDot);
    }
    if (opt.filter) {
        children = children.filter(opt.filter);
    }
    let res = [];
    children.forEach(f => {
        const filepath = path.resolve(dir, f);
        const stat = fse.statSync(filepath);
        if (stat.isFile()) {
            res.push({
                purename: path.basename(filepath),
                fullpath: filepath,
            });
        } else if (stat.isDirectory()) {
            res = res.concat(walk(filepath, opt));
        }
    });
    return res;
}