export type UiChoice = "tui" | "classic" | "noninteractive";
export interface UiSelectionOptions {
    readonly ui?: string | undefined;
    readonly tui?: boolean | undefined;
    readonly classic?: boolean | undefined;
}
export interface PlatformProbe {
    readonly platform: NodeJS.Platform;
    readonly stdoutIsTTY: boolean;
    readonly stdinIsTTY: boolean;
    readonly columns: number | undefined;
    readonly rows: number | undefined;
}
export type UiChoiceSource = "ui-flag" | "classic-flag" | "tui-flag" | "clai-ui-env" | "classic-env" | "plain-env" | "platform-default";
export interface UiSelectionExplanation {
    readonly choice: UiChoice;
    readonly source: UiChoiceSource;
    readonly reason: string;
}
export declare const UI_FLAG_CHOICES: readonly ["tui", "v2", "opentui", "classic", "legacy", "ink"];
export declare function normalizeUiToken(value: string | undefined): UiChoice | undefined;
export declare function defaultUiForPlatform(input: PlatformProbe): UiChoice;
export declare function currentPlatformProbe(): PlatformProbe;
export declare function explainUiChoice(options: UiSelectionOptions, env?: NodeJS.ProcessEnv, platform?: PlatformProbe): UiSelectionExplanation;
export declare function resolveUiChoice(options: UiSelectionOptions, env?: NodeJS.ProcessEnv, platform?: PlatformProbe): UiChoice;
export declare function isTuiRequested(options: UiSelectionOptions, env?: NodeJS.ProcessEnv, platform?: PlatformProbe): boolean;
export declare function describeUiDefault(): string;