import { type TNull, type TObject, type TOptional, type TSchema, type TUndefined, type TUnion } from '@sinclair/typebox';
/**
 * Checks if a schema is an object schema.
 *
 * @category Internal
 */
export declare function isObjectSchema(schema: TSchema): schema is TObject;
/**
 * Checks if a schema is a union schema.
 *
 * @category Internal
 */
export declare function isUnionSchema(schema: TSchema): schema is TUnion;
/**
 * Checks if a schema is an optional schema.
 *
 * @category Internal
 */
export declare function isOptionalSchema(schema: TSchema): schema is TOptional<TSchema>;
/**
 * Checks if a schema is a null schema.
 *
 * @category Internal
 */
export declare function isNullSchema(schema: TSchema): schema is TNull;
/**
 * Checks if a schema is an undefined schema.
 *
 * @category Internal
 */
export declare function isUndefinedSchema(schema: TSchema): schema is TUndefined;
/**
 * Checks if a schema guard matches the schema or a part of the schema's union.
 *
 * @category Internal
 */
export declare function matchesSchemaGuard<T extends TSchema>(schema: TSchema, guard: (schema: TSchema) => schema is T): schema is T;
/**
 * Checks if a schema can be nullable (optional, `undefined`, or `null`).
 *
 * @category Internal
 */
export declare function canSchemaBeNullable(schema: TSchema): boolean;
/**
 * Inserts a value into a union schema, converting the original schema into a union if it isn't
 * already.
 *
 * @category Internal
 */
export declare function insertUnion({ insertion, originalSchema, }: {
    originalSchema: TSchema;
    insertion: TSchema;
}): TUnion;
/**
 * Runs a `transform` function on a schema or any part of its union that matches `guard`.
 *
 * @category Internal
 */
export declare function operateOnExtraction<const Guarded extends TSchema>(originalSchema: TSchema, guard: (schema: TSchema) => schema is Guarded, transform: (schema: Guarded) => TSchema): TSchema;