/**
 * Result of applying workbook protection — contains the fields that both
 * Workbook and WorkbookWriter need to persist.
 */
export interface WorkbookProtectionHash {
    lockStructure?: boolean;
    lockWindows?: boolean;
    lockRevision?: boolean;
    algorithmName?: string;
    hashValue?: string;
    saltValue?: string;
    spinCount?: number;
}
/**
 * Build a workbook-protection object with optional password hashing.
 *
 * This is the shared implementation used by both `Workbook.protect()` and
 * `WorkbookWriter.protect()`. The caller is responsible for assigning the
 * result to its own `protection` field.
 *
 * @param password - Optional password to hash
 * @param options  - Optional protection flags (lockStructure, lockWindows, lockRevision, spinCount)
 * @returns A fully-populated workbook-protection object
 */
export declare function buildWorkbookProtection(password?: string, options?: {
    lockStructure?: boolean;
    lockWindows?: boolean;
    lockRevision?: boolean;
    spinCount?: number;
}): Promise<WorkbookProtectionHash>;