import type { ReadonlyPartialJSONValue } from '@lumino/coreutils';
/**
 * Parse a JSON-typed value that may have arrived as a string. Agents and the
 * MCP bridge sometimes serialize a spec (e.g. a Vega-Lite object) to a string;
 * for `application/...json` MIME types we accept either and parse the string.
 */
export declare function coerceData(mimeType: string, data: ReadonlyPartialJSONValue): ReadonlyPartialJSONValue;