export interface ProcessCpuRow {
    pid: number;
    ppid: number;
    cpuMs: number;
}
export type ProcessCpuReader = (rootPids: readonly number[]) => Promise<number | null>;
/** Root pids plus every descendant reachable through parent-pid edges. */
export declare function descendantsOf(rows: readonly Pick<ProcessCpuRow, "pid" | "ppid">[], rootPids: readonly number[]): Set<number>;
/** Parse ps' [[dd-]hh:]mm:ss cumulative CPU-time form into milliseconds. */
export declare function parsePsTime(value: string): number | null;
/** Sum cumulative CPU time for the roots and all descendants. Null means no matching process. */
export declare function sumCpuMs(rows: readonly ProcessCpuRow[], rootPids: readonly number[]): number | null;
/** Parse PowerShell ConvertTo-Json output from Win32_Process. */
export declare function parseWindowsCpuRows(text: string): ProcessCpuRow[];
/** Parse `ps -A -o pid=,ppid=,time=` output. */
export declare function parsePsCpuRows(text: string): ProcessCpuRow[];
/** Real process-tree CPU reader. Null is no signal, never an idle verdict. */
export declare const defaultProcessCpuReader: ProcessCpuReader;