/**
 * @param {string} baseUrl           e.g. `https://app.com`
 * @param {string} callbackTemplate  e.g. `/auth/{provider}/callback`
 * @param {string} providerId        substituted for `{provider}`
 * @param {string} [override]        explicit redirect_uri (odd callback paths)
 * @returns {string} the absolute, exact-match redirect URI
 */
export function resolveRedirectUri(baseUrl: string, callbackTemplate: string, providerId: string, override?: string): string;