/**
 * Extract Swift arity metadata from a function-like tree-sitter node —
 * `function_declaration`, `protocol_function_declaration`, or
 * `init_declaration`.
 *
 * Reuses `swiftMethodConfig.extractParameters` so scope-extracted defs
 * carry the same arity semantics as the legacy parse-worker path:
 *   - Variadic params (`xs: Int...`) collapse `parameterCount` to
 *     `undefined`, which `swiftArityCompatibility` treats as "max
 *     unknown" — the candidate stays eligible at `argCount >= required`.
 *   - Defaulted params (`= expr`) contribute to `optionalCount`;
 *     `requiredParameterCount = total − optionalCount`.
 *   - `parameterTypes` collects declared type names for narrowing; a
 *     literal `'variadic'` marker is appended for variadic methods so
 *     `swiftArityCompatibility` can detect them without re-reading AST.
 */
import type { SyntaxNode } from '../../utils/ast-helpers.js';
interface SwiftArityMetadata {
    readonly parameterCount: number | undefined;
    readonly requiredParameterCount: number | undefined;
    readonly parameterTypes: readonly string[] | undefined;
}
export declare function computeSwiftArityMetadata(fnNode: SyntaxNode): SwiftArityMetadata;
export {};