/**
 * DynamoDB Update Expression Types
 * @see https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.Modifying.html
 */
/** Primitive value types supported by DynamoDB */
export type DdbValueType = boolean | number | string | Record<string, any>;
/** All DynamoDB value types including arrays */
export type DdbValueAllType = DdbValueType | DdbValueType[];
/**
 * Path-value pair for SET operations.
 * Used with if_not_exists() and list_append() functions.
 */
export type DdbUpdateSetPathValue = {
    /** Attribute path (e.g., 'attributes.count') */
    path: string;
    /** Value to set */
    value: DdbValueAllType;
};
/**
 * SET operation value with optional modifiers.
 * Supports atomic counters and list operations.
 */
export type DdbUpdateSetValue = {
    /** Increment numeric value by this amount */
    incrementBy?: number;
    /** Decrement numeric value by this amount */
    decrementBy?: number;
    /** Set value only if attribute doesn't exist */
    ifNotExists?: string | DdbUpdateSetPathValue;
    /** Append to list attribute */
    listAppend?: string[] | DdbUpdateSetPathValue;
};
/**
 * DynamoDB UpdateItem expression builder.
 * Provides type-safe interface for update operations.
 *
 * @example
 * const update: DdbUpdateItem = {
 *   set: { name: 'New Name', 'attributes.count': { incrementBy: 1 } },
 *   remove: { oldField: true }
 * }
 */
export interface DdbUpdateItem {
    /** SET expression - add or modify attributes */
    set?: Record<string, DdbValueAllType | DdbUpdateSetValue>;
    /** REMOVE expression - delete attributes or list elements */
    remove?: Record<string, boolean | {
        index: number;
    }>;
    /** DELETE expression - remove elements from a set */
    delete?: Record<string, DdbValueType>;
}