/**
 * Update project command payload definition.
 */
type UpdateProject = {
    /**
     * The Things URL scheme authorization token.
     */
    authToken: string;
    /**
     * The ID of the project to update.
     */
    id: string;
    /**
     * The title of the project. This will replace the existing title.
     */
    title?: string;
    /**
     * The notes of the project. This will replace the existing notes.
     */
    notes?: string;
    /**
     * Text to add before the existing notes of a project.
     */
    prependNotes?: string;
    /**
     * Text to add after the existing notes of a project.
     */
    appendNotes?: string;
    /**
     * Set the when field of a project. Possible values: today, tomorrow, evening, someday, a date string, or a date time string.
     */
    when?: string;
    /**
     * The deadline to apply to the project. Empty string to clear.
     */
    deadline?: string;
    /**
     * Comma separated strings corresponding to the titles of tags. Replaces all current tags.
     */
    tags?: string;
    /**
     * Comma separated strings corresponding to the titles of tags. Adds the specified tags to a project.
     */
    addTags?: string;
    /**
     * The ID of an area to move the project into. Takes precedence over area.
     */
    areaId?: string;
    /**
     * The title of an area to move the project into. Ignored if area-id is present.
     */
    area?: string;
    /**
     * Complete a project or set a project to incomplete.
     */
    completed?: boolean;
    /**
     * Cancel a project or set a project to incomplete. Takes priority over completed.
     */
    canceled?: boolean;
    /**
     * Whether or not to navigate to and show the updated project. Default: false.
     */
    reveal?: boolean;
    /**
     * Set to true to duplicate the project before updating it. Default: false.
     */
    duplicate?: boolean;
    /**
     * Set the creation date for the project in the database.
     */
    creationDate?: string;
    /**
     * Set the completion date for the project in the database.
     */
    completionDate?: string;
};
/**
 * Update an existing project in Things.
 *
 * @param payload Update project command payload.
 * @returns Things update-project URL.
 * @example
 * updateProject({ id: 'Jvj7EW1fLoScPhaw2JomCT', authToken: 'xxx', when: 'tomorrow' })
 * // => 'things:///update-project?id=Jvj7EW1fLoScPhaw2JomCT&auth-token=xxx&when=tomorrow'
 * @example
 * updateProject({ id: 'Jvj7EW1fLoScPhaw2JomCT', authToken: 'xxx', addTags: 'Important' })
 * // => 'things:///update-project?id=Jvj7EW1fLoScPhaw2JomCT&auth-token=xxx&add-tags=Important'
 * @example
 * updateProject({ id: 'Jvj7EW1fLoScPhaw2JomCT', authToken: 'xxx', deadline: '' })
 * // => 'things:///update-project?id=Jvj7EW1fLoScPhaw2JomCT&auth-token=xxx'
 * @link https://culturedcode.com/things/support/articles/2803573/#update-project
 */
export declare function updateProject(payload: UpdateProject): string;
export {};