/**
 * Submits a grade passback request to Canvas
 * @author Gabe Abrams
 * @param opts object containing all arguments
 * @param opts.request an object containing all the information for the
 *   passback request
 * @param [opts.request.text] the text of the submission. If this is
 *   included, url cannot be included
 * @param [opts.request.url] a url to send as the student's submission.
 *   If this is included, text cannot be included
 * @param [opts.request.score] the student's score on this assignment
 * @param [opts.request.percent] the student's score as a percent (0-100)
 *   on the assignment
 * @param [opts.request.submittedAt=now] a timestamp for when the
 *   student submitted the grade. The type must either be a Date object or an
 *   ISO 8601 formatted string
 * @param opts.info an object containing all LTI info required for the
 *   grade passback process
 * @param opts.info.sourcedId the LTI sourcedid
 * @param opts.info.url the LTI outcome service url
 * @param opts.credentials an object containing the app's credentials
 * @param opts.credentials.consumerKey the app's consumer key
 * @param opts.credentials.consumerSecret the app's consumer secret
 * @returns true if the request was successful
 */
declare const handlePassback: (opts: {
    request: {
        text?: string;
        url?: string;
        score?: number;
        percent?: number;
        submittedAt?: (Date | string);
    };
    info: {
        sourcedId: string;
        url: string;
    };
    credentials: {
        consumerKey: string;
        consumerSecret: string;
    };
}) => Promise<boolean>;
export default handlePassback;