/**
 * Manages secret files in a secure directory
 *
 * Security features:
 * - Files stored on tmpfs (never touch disk)
 * - Directory has 0700 permissions (root only)
 * - Files have 0600 permissions (root only)
 * - Files are cleaned up on process exit
 */
export declare class SecretFileManager {
    private readonly secretsDir;
    private readonly writtenFiles;
    private cleanupRegistered;
    constructor(secretsDir?: string);
    /**
     * Initialize the secrets directory with secure permissions
     */
    initialize(): void;
    /**
     * Write a secret to a file
     * Returns the path to the file
     */
    writeSecret(name: string, value: string): string;
    /**
     * Read a secret from a file
     */
    readSecret(name: string): string;
    /**
     * Delete a specific secret file
     */
    deleteSecret(name: string): void;
    /**
     * Clean up all written secret files
     */
    cleanup(): void;
    /**
     * Get the secrets directory path
     */
    getSecretsDir(): string;
    /**
     * List all secret files
     */
    listSecrets(): string[];
    /**
     * Verify the secrets directory is on tmpfs (best effort)
     */
    private verifyTmpfs;
    /**
     * Register cleanup handler for process exit
     */
    private registerCleanup;
}
/**
 * Get the default SecretFileManager instance
 */
export declare function getSecretFileManager(): SecretFileManager;
/**
 * Initialize the default SecretFileManager
 */
export declare function initializeSecretFiles(): SecretFileManager;
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