/**
 * Compute Shannon entropy of a string (bits per character).
 *
 * High-entropy strings (≥ 4.5 bits/char) with sufficient length are
 * characteristic of randomly-generated secrets (API keys, JWT tokens,
 * random passwords). Normal English text sits around 3.5-4.0 bits/char.
 *
 * Reference: https://en.wikipedia.org/wiki/Entropy_(information_theory)
 */
export declare function shannonEntropy(str: string): number;
export declare function looksLikeSecret(value: string): boolean;
export interface SecretScanResult {
    hasSecrets: boolean;
    detectedKeys: string[];
}
export declare function scanEnvironmentForSecrets(env: NodeJS.ProcessEnv): SecretScanResult;
export declare function buildEnvironmentSchema(env: NodeJS.ProcessEnv, detectedSecrets: string[]): {
    required: string[];
    optional: string[];
    secrets: string[];
    captured_env_keys: string[];
};
export declare function sanitizePII(text: string): string;
//# sourceMappingURL=secrets.d.ts.map