import { type Logger } from '@kyrielle/logger';
export declare class PidFile {
    readonly filename: string;
    readonly logger?: Logger | undefined;
    /**
     * @param filename path to the managed pid file
     * @param logger custom logger
     */
    constructor(filename: string, logger?: Logger | undefined);
    private static _processIsRunning;
    /**
     * Creates pid file. If the pid file already exists tries to update it.
     * Returns true if the pid file was successfully created/updated, false otherwise.
     */
    create(): Promise<'created' | 'updated' | false>;
    /**
     * Tries to update the pid file.
     * Returns true if the pid file was updated false otherwise.
     */
    update(): Promise<boolean>;
    /**
     * Deletes the pid file.
     */
    delete(): Promise<void>;
}