Base64 URL Encode Decode Typescript

base64.ts

export function encode(unencoded: string) {
    return Buffer.from(unencoded).toString('base64');
};

export function decode(encoded: string) {
    return Buffer.from(encoded, 'base64').toString('utf8');
};

export function urlEncode(unencoded: string) {
    let encoded = encode(unencoded);
    return encoded.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');
};

export function urlDecode(encoded: string) {
    let decoded = encoded.replace(/-/g, '+').replace(/_/g, '/');
    while (decoded.length % 4) decoded += '=';
    return decode(decoded);
};