import type { ChildProcess } from 'node:child_process';
import { Writable } from 'node:stream';
import { type OmpSdkCollectedTerminal, type OmpSdkSidecarRequest } from './sdk-protocol';
export declare const MAX_STDERR_BYTES: number;
export declare const DEFAULT_TERMINATION_GRACE_MS = 250;
export declare const DEFAULT_REAP_TIMEOUT_MS = 2000;
export interface ChildOutcome {
    readonly exitCode: number | null;
    readonly signal: NodeJS.Signals | null;
    readonly spawnError?: Error;
}
export declare function cancelledTerminal(request: OmpSdkSidecarRequest): OmpSdkCollectedTerminal;
export declare function childClose(child: ChildProcess): Promise<ChildOutcome>;
export declare function credentialWriter(child: ChildProcess): Writable;
export declare function writeCredentials(channel: Writable, payload: Buffer): Promise<void>;
export declare function duration(value: number | undefined, fallback: number): number;
export declare function testIdentityCapArgument(): readonly string[];
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