/** ES2024 String.prototype.isWellFormed — guaranteed at runtime by the
 *  package's engines floor (node >= 20) but absent from this tsconfig's
 *  ES2022 lib, hence the local cast. The one lone-surrogate detector in the
 *  package: canonicalJson rejects ill-formed strings below, and the wire
 *  compiler (state.ts) keeps them out of props/islands so this never throws
 *  downstream. */
export declare const isWellFormedUtf16: (text: string) => boolean;
/** 01-core §4 */
export declare function canonicalJson(value: unknown): string;