/**
 * Validates a Salesforce ID format (15 or 18 characters, alphanumeric).
 *
 * @param id - The value to validate
 * @returns Error message if invalid, undefined if valid
 */
export declare function validateSalesforceId(id: string): string | undefined;
/**
 * Validates a Salesforce object API name.
 *
 * @param objectName - The value to validate
 * @returns Error message if invalid, undefined if valid
 */
export declare function validateObjectName(objectName: string): string | undefined;
/**
 * Validates that a required string is non-empty.
 *
 * @param value - The value to validate
 * @param fieldName - Name of the field (for error message)
 * @returns Error message if invalid, undefined if valid
 */
export declare function validateRequiredString(value: string | undefined | null, fieldName: string): string | undefined;
/**
 * Validates a Salesforce namespace format.
 *
 * @param namespace - The namespace to validate
 * @returns Error message if invalid, undefined if valid
 */
export declare function validateNamespace(namespace: string): string | undefined;
/**
 * Validates a non-empty array with an optional maximum size.
 *
 * @param arr - The array to validate
 * @param fieldName - Name of the field (for error message)
 * @param maxItems - Maximum allowed items
 * @returns Error message if invalid, undefined if valid
 */
export declare function validateNonEmptyArray(arr: unknown[] | undefined | null, fieldName: string, maxItems: number): string | undefined;
/**
 * Validates pagination parameters (limit and offset).
 *
 * @param limit - The limit value
 * @param offset - The offset value
 * @param maxLimit - Maximum allowed limit
 * @returns Error message if invalid, undefined if valid
 */
export declare function validatePagination(limit?: number, offset?: number, maxLimit?: number): string | undefined;