/**
 * Add URL to Instapaper payload definition.
 */
type Add = {
    /**
     * The URL to add to Instapaper.
     *
     * @example 'https://example.com/article'
     */
    url: string;
    /**
     * The human-readable name of your app that will be presented in the dialog.
     *
     * @example 'MyReader'
     */
    xSource?: string;
    /**
     * The URL to call back after the user has responded to the Instapaper "Add" dialog.
     * If unspecified, Instapaper will remain open.
     *
     * @example 'myapp://success'
     */
    xSuccess?: string;
    /**
     * The URL to call back if it fails for some unforeseen reason or if the user isn't logged in.
     * If unspecified, the x-success URL is called.
     *
     * @example 'myapp://error'
     */
    xError?: string;
};
/**
 * Add a URL to Instapaper using x-callback-url standard.
 *
 * @param payload Add URL to Instapaper payload.
 * @returns Instapaper x-callback-url URL.
 * @example
 * add({
 *   url: 'https://example.com/article',
 * })
 * // => 'x-callback-instapaper://x-callback-url/add?url=https%3A%2F%2Fexample.com%2Farticle'
 * @example
 * add({
 *   url: 'https://example.com/article',
 *   xSource: 'MyReader',
 *   xSuccess: 'myapp://success',
 * })
 * // => 'x-callback-instapaper://x-callback-url/add?url=https%3A%2F%2Fexample.com%2Farticle&x-source=MyReader&x-success=myapp%3A%2F%2Fsuccess'
 * @link https://blog.instapaper.com/post/4637427075
 */
export declare function add(payload: Add): string;
export {};