import { DescExtension, DescField } from "./descriptor-set.js";
/**
 * Returns the zero value for a field.
 *
 * Returns either:
 * - empty array literal for repeated fields
 * - Object.create(null) for maps
 * - undefined for message fields
 * - an enums first value
 * - scalar zero value
 */
export declare function getFieldZeroValue(field: DescField | DescExtension): any;
/**
 * Returns true for a zero-value (all fields are zero).
 *
 * In proto3, zero-values are not written to the wire, unless the field is
 * optional or repeated.
 */
export declare function isMessageZeroValue<T extends Record<string, any>>(value: T | null | undefined, fields: (DescField | DescExtension)[]): boolean;
/**
 * Compares if the value is considered a zero value for the field.
 */
export declare function compareFieldZeroValue<T>(field: DescField | DescExtension, value: T | null | undefined): boolean;