/**
 * Secret detection: high-signal provider token patterns plus a
 * generic high-entropy fallback. Kept conservative to limit false positives.
 */
export interface SecretMatch {
    readonly kind: string;
    readonly match: string;
}
/** Shannon entropy in bits/char. */
export declare function shannonEntropy(input: string): number;
/** A long, high-entropy, machine-charset token is a likely secret even without a known prefix. */
export declare function looksHighEntropy(token: string): boolean;
/** Find secrets in an arbitrary text blob. Returns redacted evidence. */
export declare function detectSecrets(text: string): SecretMatch[];