export type UpgradePm2ProcessDetectResult = {
    found: true;
    processName: string;
} | {
    found: false;
    reason: string;
};
/**
 * Detects whether PM2 has a running process with the provided name.
 * Expects: processName is non-empty and references the PM2 process to restart.
 */
export declare function upgradePm2ProcessDetect(processName: string): Promise<UpgradePm2ProcessDetectResult>;
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