import type { TObject, TSchema } from "@sinclair/typebox";
import { JavaScriptType } from "./typebox-types.js";
/**
 * Information about a TypeBox schema that's cached to improve the
 * performance of `parseFormFields()`.
 */
export interface SchemaInfo<T extends TSchema> {
    schema: T;
    fieldNames: string[];
    fields: Record<string, FieldInfo>;
    defaultObject: Record<string, unknown>;
}
/**
 * Information about a property of a TypeBox schema that's cached to
 * improve the performance of `parseFormFields()`.
 */
export interface FieldInfo {
    fieldName: string | null;
    fieldType: JavaScriptType;
    memberType: JavaScriptType | null;
    isNullable: boolean;
    isOptional: boolean;
    hasDefault: boolean;
    defaultValue: unknown;
}
/**
 * Extracts the information from a TypeBox schema needed to parse form data
 * and query parameters, caching the information to improve performance.
 * @param schema A TypeBox schema defining an object.
 * @param modify A function that can extend the cached schema information
 *  with additional information needed by the application.
 * @returns Cached information about the schema.
 */
export declare function getSchemaInfo<T extends TObject, U extends SchemaInfo<T>>(schema: T, extend?: (schemaInfo: SchemaInfo<T>) => U): U;
/**
 * Clears the cache of schema information. This is useful for testing.
 */
export declare function clearSchemaInfoCache(): void;
export declare function getDefaultValue(fieldInfo: FieldInfo): unknown;
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