Encodeuri character

I’m working with another developer on a project and he asks if I know what character set encodeuricomponent is encoded too. Eg base64", “hex”, “quoted-printable” (or “qp”), “url”, “base32”, “Q”, “B”, “url_rc1738”, “url_rfc2396”, “url_rfc3986”, “url_oauth”, “uu”, “modBase64”, or “html” (for HTML entity encoding

This some AS has a default parameter? Or is he off base a bit?

From the Mozilla docs:

The encodeURI() function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two “surrogate” characters).