export declare class SecretBuffer {
    private value;
    insert(text: string, cursorOffset: number): number;
    deleteBackward(cursorOffset: number): number;
    clear(): void;
    get length(): number;
    masked(): string;
    /** The only sanctioned way to read the plaintext back out. */
    reveal(): string;
    toString(): string;
    toJSON(): string;
}