/**
 * Adds explicit select and reset masks to gRPC metadata.
 *
 * @packageDocumentation
 */
import { Metadata } from '@grpc/grpc-js';
import { Mask } from './fieldmask.js';
/** Contains the select-mask gRPC header name. */
export declare const SELECT_MASK_HEADER = "x-selectmask";
/** Contains the reset-mask gRPC header name. */
export declare const RESET_MASK_HEADER = "x-resetmask";
/** Adds an explicit mask without changing the supplied metadata. */
export declare function withMask(metadata: Metadata | undefined, header: string, mask: Mask | string): Metadata;
/** Combines all mask values from a metadata header. */
export declare function maskFromMetadata(metadata: Metadata, header: string): Mask;
/** Adds an explicit select mask. */
export declare function withSelectMask(mask: Mask | string, metadata?: Metadata): Metadata;
/** Adds an explicit reset mask. */
export declare function withResetMask(mask: Mask | string, metadata?: Metadata): Metadata;
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