/**
 * Converts protobuf `FieldMask` values between runtime, JSON, and wire forms.
 *
 * The runtime representation is `string[]`. The protobuf JSON representation
 * is one comma-separated string.
 *
 * @packageDocumentation
 */
import type { BinaryReader, BinaryWriter } from './core.js';
/**
 * Reads the protobuf `FieldMask` runtime JSON form.
 *
 * A comma-separated string becomes trimmed path strings. An array is accepted
 * for compatibility and each element is converted to a string. Other values
 * produce an empty array.
 */
export declare function fmFromJSON(o: unknown): string[];
/** Converts field-mask paths to the protobuf JSON comma-separated string form. */
export declare function fmToJSON(paths: string[]): string;
/** Writes each path as field 1 of a protobuf `FieldMask` message. */
export declare function writeFieldMask(writer: BinaryWriter, paths: string[]): void;
/**
 * Reads one length-delimited protobuf `FieldMask` message body.
 *
 * Unknown fields are skipped. The returned paths keep their wire order.
 */
export declare function readFieldMask(reader: BinaryReader, length: number): string[];
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