import type { EnvVar } from '../types.js';
export interface MaskedVar {
    key: string;
    masked: string;
    isSet: boolean;
}
/**
 * Fixed-width redaction. Deliberately reveals neither a prefix nor the exact
 * length of the value: masked output may be read by AI agents, and prefix or
 * length disclosure materially narrows guessing for structured tokens.
 */
export declare function maskValue(value: string): string;
export declare function maskVars(vars: EnvVar[]): MaskedVar[];
export declare function formatMaskedVar(v: MaskedVar, maxKeyLen: number): string;
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