import type { SemanticVersion } from './SemanticVersion';
/**
 * @file Type Definitions - UpdaterCustom
 * @module grease/types/UpdaterCustom
 */
/**
 * Custom updater used for reading `packageFiles` and writing to `bumpFiles`.
 */
export declare type UpdaterCustom = {
    /**
     * Reads the package version from the provided file `contents`.
     *
     * @param {string} contents - File content
     * @return {SemanticVersion} Package version (a valid semantic version string)
     */
    readVersion(contents: string): SemanticVersion;
    /**
     * Writes `version` to `contents`.
     *
     * @param {string} contents - File content
     * @param {SemanticVersion} version - Package version
     * @return {string} New file content
     */
    writeVersion(contents: string, version: SemanticVersion): string;
};