/**
 * Signature Parser
 *
 * Parses annotated rill closure type signature strings at registration time.
 * This module bridges the lexer/parser boundary so that runtime/core/context.ts
 * can parse signatures without importing from parser/* or lexer/* directly.
 *
 * Import boundary note:
 * - This file lives at src/ level (not in runtime/), so it may import from
 *   both lexer and parser barrels.
 * - runtime/core/context.ts imports from this file (../../signature-parser.js),
 *   which is NOT in parser/* or lexer/* — boundary preserved.
 */
import type { RillParam } from './runtime/core/callable.js';
import type { TypeStructure } from './runtime/core/types/structures.js';
/**
 * Result of parsing a signature string at registration time.
 */
interface ParsedSignature {
    readonly params: RillParam[];
    readonly returnType: TypeStructure | undefined;
    readonly description: string | undefined;
}
/**
 * Parse a rill closure type signature string into structured parameter declarations.
 *
 * Signature format (optional closure-level annotation before param list):
 * ```
 * ^(description: "...") |^(description: "...") x: string = "default", y: number|:string
 * ```
 * The return type follows `:type` directly after the closing `|`.
 *
 * Throws Error with message `Invalid signature for function '{name}': {parse error}`
 * on any parse failure.
 *
 * @param signature - The signature string to parse
 * @param functionName - The function name (for error messages)
 * @returns Parsed params, return type, and description
 *
 * @internal
 */
export declare function parseSignatureRegistration(signature: string, functionName: string): ParsedSignature;
export {};