import type { BashHostFallbackCause } from "./error-contract.js";
export declare const BASH_HOST_FALLBACK_BANNER = "[AFT host fallback - module transport down; no rewrites/compression/background]";
export declare const BASH_HOST_FALLBACK_MAX_OUTPUT_BYTES: number;
export declare const BASH_HOST_FALLBACK_MAX_TIMEOUT_MS: number;
export declare const BASH_HOST_FALLBACK_REFUSAL = "AFT transport is down; only foreground execution is available in host fallback";
export interface BashHostFallbackOptions {
    command: string;
    projectRoot: string;
    timeoutMs?: number;
    signal?: AbortSignal;
    env?: NodeJS.ProcessEnv;
}
export interface BashHostFallbackResult extends Record<string, unknown> {
    success: true;
    output: string;
    exit_code: number;
    truncated: boolean;
}
export declare function hostFallbackPathWithShims(env: NodeJS.ProcessEnv, platform?: NodeJS.Platform): string | undefined;
export declare function bashHostFallbackAskPattern(command: string, cwd: string, cause?: BashHostFallbackCause): string;
/** Execute one explicitly-approved shell command without any AFT processing. */
export declare function runBashHostFallback(options: BashHostFallbackOptions): Promise<BashHostFallbackResult>;
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