import type { GuardrailRule, GuardrailContext, GuardrailViolation } from "../types/guardrails";
export declare function isZeroOutput(content: string): boolean;
export declare function isNoiseOnly(content: string): boolean;
export declare function validateZeroOutput(context: GuardrailContext): GuardrailViolation[];
export declare function zeroOutputRule(): GuardrailRule;
export declare class ZeroOutputGuardrail {
    private rule;
    constructor();
    check(context: GuardrailContext): GuardrailViolation[];
    get name(): string;
}
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