/** Number of leading characters shown for identification on credential display surfaces. */
export declare const CREDENTIAL_PREFIX_LENGTH = 4;
/** Fixed asterisk pad length for masked credentials (does not encode secret length). */
export declare const CREDENTIAL_MASK_PAD_LENGTH = 14;
/**
 * Mask a credential for UI display: first {@link CREDENTIAL_PREFIX_LENGTH} characters
 * plus a fixed asterisk pad. The full secret must never be returned on ordinary reads.
 */
export declare const maskCredential: (key: string) => string;
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