import { type ProgramIO } from '../cli-helpers.js';
/** The emit context shared by every plan subcommand: where and how to report. */
export interface PlanCommandContext {
    readonly io: ProgramIO;
    readonly command: string;
    readonly asJson: boolean | undefined;
}
export declare function isValidSessionId(value: string): boolean;
/**
 * Resolve the session id for a plan subcommand: an explicit `--session-id` is
 * validated; otherwise the active session is read and validated defensively. On
 * any rejection the subcommand envelope is printed, the exit code set to 1 and
 * `null` returned so the caller can bail without touching the result path.
 */
export declare function resolveSessionId(ctx: PlanCommandContext, projectRoot: string, explicit: string | undefined): string | null;
/** Resolve the project root: an explicit `--project`, else the discovered root. */
export declare function resolveProjectRoot(projectArg: string | undefined): string;