import type { WriteStream } from 'tty';
export interface TerminalStreams {
    stdout?: WriteStream | null;
    stderr?: WriteStream | null;
}
export declare function envFlagEnabled(value: string | undefined): boolean;
export declare function hasPositiveDimension(value: number | undefined): boolean;
/**
 * Determine whether the current terminal supports rich output (spinners, colors, sizing).
 * Streams and environment can be injected to simplify testing.
 */
export declare function hasRichTTY(streams?: TerminalStreams, env?: NodeJS.ProcessEnv): boolean;
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