import { ArgumentMetadata, PipeTransform } from '../interfaces/features/pipe-transform.interface.js';
/**
 * Defines the built-in DefaultValue Pipe
 *
 * A default value that is an array or a plain object is copied on every call
 * (along with the arrays and plain objects nested in it), so that a handler
 * that mutates its argument does not change it for subsequent requests. Any
 * other object (e.g., a class instance, a `Date` or a `Map`) is returned as is.
 *
 * @see [Built-in Pipes](https://docs.nestjs.com/pipes#built-in-pipes)
 *
 * @publicApi
 */
export declare class DefaultValuePipe<T = any, R = any> implements PipeTransform<T, T | R> {
    protected readonly defaultValue: R;
    constructor(defaultValue: R);
    transform(value?: T, _metadata?: ArgumentMetadata): T | R;
    /**
     * Copies `value` if it is an array or a plain object, along with the arrays
     * and plain objects nested in it. `copies` maps the objects copied so far
     * to their copies, so that shared and circular references are preserved.
     */
    protected copyDefaultValue<V>(value: V, copies?: Map<unknown, unknown>): V;
}