/**
 * Supported filter operators for generic column-based filtering.
 *
 * Compatible with flip-nestjs SqlQueryBuilderService ColumnFilter[].
 */
export type FilterOperator = 'equals' | 'notEquals' | 'contains' | 'notContains' | 'iContains' | 'startsWith' | 'endsWith' | 'gt' | 'gte' | 'lt' | 'lte' | 'between' | 'notBetween' | 'in' | 'notIn' | 'isAnyOf' | 'isEmpty' | 'isNotEmpty' | 'isNull' | 'isNotNull' | 'exists' | 'notExists';
/**
 * All valid operator strings, used for runtime validation.
 */
export declare const FILTER_OPERATORS: readonly FilterOperator[];
/**
 * SQL-symbol aliases accepted on input and normalized to a canonical
 * {@link FilterOperator} before validation and query building. Lets callers
 * write the familiar `=`/`!=`/`<`/`>` shorthands instead of the named form.
 */
export declare const OPERATOR_ALIASES: Readonly<Record<string, FilterOperator>>;
/**
 * An operator alias string (e.g. `'='`). Always normalized to a canonical
 * {@link FilterOperator} via `normalizeOperator`.
 */
export type FilterOperatorAlias = keyof typeof OPERATOR_ALIASES;
/**
 * Operator value accepted on input: either a canonical {@link FilterOperator}
 * or one of its SQL-symbol {@link FilterOperatorAlias aliases}.
 */
export type FilterOperatorInput = FilterOperator | FilterOperatorAlias;
/**
 * A single column filter condition with optional AND/OR composition.
 */
export interface ColumnFilter {
    field: string;
    operator: FilterOperatorInput;
    value?: unknown;
    AND?: ColumnFilter[];
    OR?: ColumnFilter[];
}
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