export type ProcessIdentityComparison = "match" | "mismatch" | "gone" | "unknown";
export interface ProcessIdentityProvider {
    readonly platform: NodeJS.Platform | "test";
    capture(pid: number): string | undefined;
}
export declare const defaultProcessIdentityProvider: ProcessIdentityProvider;
export declare class ProcessIdentityTracker {
    private readonly provider;
    private readonly now;
    private readonly alive;
    private readonly cache;
    constructor(provider?: ProcessIdentityProvider, now?: () => number, alive?: (pid: number | undefined) => boolean);
    capture(pid: number | undefined, options?: {
        refresh?: boolean;
    }): string | undefined;
    compare(pid: number | undefined, expected: string | undefined): ProcessIdentityComparison;
    forget(pid: number | undefined): void;
    private prune;
}
export declare const processIdentityTracker: ProcessIdentityTracker;
export declare function processIdentity(pid: number | undefined, options?: {
    refresh?: boolean;
}): string | undefined;
export declare function forgetProcessIdentity(pid: number | undefined): void;