/**
 * Input type derivation for function binding mutations.
 *
 * Derives a protocol-agnostic field list from a function's payload metadata.
 * Priority:
 *   1. A JSON Schema on the binding config (`config.schema` or
 *      `config.payloadSchema`) — object properties become input fields.
 *   2. The definition's `payload_args` ([{name, type}]) — each declared arg
 *      becomes a nullable scalar field.
 *   3. Fallback: a single `payload: JSON` field.
 *
 * The derived shape is deliberately independent of graphql-js so it can be
 * reused for future REST payload validation. No runtime validation is
 * performed here — this is type derivation only.
 */
import type { FunctionBindingRow } from './types';
/** Named scalar kinds the plugin knows how to resolve against the schema. */
export type DerivedScalar = 'String' | 'Int' | 'Float' | 'Boolean' | 'UUID' | 'Datetime' | 'BigFloat' | 'JSON';
export interface DerivedField {
    name: string;
    scalar: DerivedScalar;
    required: boolean;
    list: boolean;
    description?: string;
    /** When set, the field is an enum of these string values. */
    enumValues?: string[];
}
export interface DerivedInput {
    /** 'schema' | 'payload-args' | 'fallback' */
    source: 'schema' | 'payload-args' | 'fallback';
    fields: DerivedField[];
}
/**
 * Derive the input field list for a binding's mutation.
 */
export declare function deriveInputFields(binding: FunctionBindingRow): DerivedInput;
/**
 * Assemble the invocation payload jsonb from the mutation input values.
 * Fallback inputs pass `payload` through verbatim; typed inputs build an
 * object keyed by field name, omitting undefined values.
 */
export declare function buildInvocationPayload(derived: DerivedInput, input: Record<string, unknown>): unknown;
/** Whether a binding's config enables GraphQL exposure (absent ⇒ enabled). */
export declare function isGraphqlEnabled(config: Record<string, unknown> | null): boolean;