auth.js

const REGEX_IS_INSTALLATION_LEGACY = /^v1\./;
const REGEX_IS_INSTALLATION = /^ghs_/;
const REGEX_IS_USER_TO_SERVER = /^ghu_/;
export async function auth(token) {
    const isApp = token.split(/\./).length === 3;
    const isInstallation = REGEX_IS_INSTALLATION_LEGACY.test(token) ||
        REGEX_IS_INSTALLATION.test(token);
    const isUserToServer = REGEX_IS_USER_TO_SERVER.test(token);
    const tokenType = isApp
        ? "app"
        : isInstallation
            ? "installation"
            : isUserToServer
                ? "user-to-server"
                : "oauth";
    return {
        type: "token",
        token: token,
        tokenType,
    };
}