mauss/src/sys/index.js

lightweight, modular, type-safe utilities

/** Joins all given parameters together using `/`, regardless of the platform */
export function catenate(...paths) {
    if (!paths.length)
        return '.';
    const index = paths[0].replace(/\\/g, '/').trim();
    if (paths.length === 1 && index === '')
        return '.';
    const parts = index.replace(/[/]*$/g, '').split('/');
    if (parts[0] === '')
        parts.shift();
    for (let i = 1; i < paths.length; i += 1) {
        const part = paths[i].replace(/\\/g, '/').trim();
        for (const slice of part.split('/')) {
            if (slice === '.')
                continue;
            if (slice === '..')
                parts.pop();
            else if (slice)
                parts.push(slice);
        }
    }
    return (index[0] === '/' ? '/' : '') + parts.join('/');
}