/**
 * Utilities for ETag-based optimistic concurrency control
 *
 * ETags allow agents to safely read-modify-write Memory Bank files
 * by detecting concurrent modifications. This prevents data loss
 * when multiple agents work on the same files.
 */
export declare class ETagUtils {
    /**
     * Calculates an ETag for the given content
     *
     * Uses SHA-256 hash of the content, truncated to 16 characters
     * for a practical balance between collision resistance and readability.
     *
     * @param content - Content to calculate ETag for
     * @returns ETag string (16-character hex string)
     */
    static calculateETag(content: string): string;
    /**
     * Validates that the given content matches the expected ETag
     *
     * @param content - Content to validate
     * @param expectedETag - Expected ETag value
     * @returns True if the ETag matches, false otherwise
     */
    static validateETag(content: string, expectedETag: string): boolean;
    /**
     * Creates a response object with content and ETag
     *
     * @param content - File content
     * @returns Object with content and etag properties
     */
    static withETag(content: string): {
        content: string;
        etag: string;
    };
}
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