/**
 * Reading plugin config out of the page.
 *
 * Reveal plugins take per-slide settings from data attributes, which arrive as
 * strings that are nearly-but-not-quite JSON — unquoted keys, single quotes, and
 * whatever quotation marks the author's editor decided to use. These two turn
 * that into something `JSON.parse` accepts.
 */
/**
 * Whether a string parses as JSON.
 */
export declare const isJSON: (str: string) => boolean;
/**
 * Convert an object, or the loose JSON people write in a data attribute, into a
 * JSON string.
 *
 * Smart quotes are replaced first — an editor or a CMS will have turned `"` into
 * `“` — and a bare `key: value` list is wrapped in braces, so
 * `data-x="delay: 100"` parses like `{"delay": 100}`.
 */
export declare const toJSONString: (str?: unknown) => string;