import type { ClickHouseColumnBuilderLike, ClickHouseColumnDefaultValue, ClickHouseDefaultInput, ClickHouseColumnDefinition, ClickHouseColumnType } from './types.js';
type NestedColumnTypeInput = string | ClickHouseColumnBuilder | ClickHouseColumnType;
/**
 * Immutable builder for ClickHouse column definitions.
 *
 * Each modifier returns a new builder so reusable column fragments can be shared
 * safely without later calls mutating earlier definitions.
 */
export declare class ClickHouseColumnBuilder implements ClickHouseColumnBuilderLike {
    private readonly columnType;
    private readonly defaultExpression?;
    constructor(columnType: ClickHouseColumnType, defaultExpression?: ClickHouseColumnDefaultValue | undefined);
    /**
     * Adds a column default.
     *
     * Primitive values are rendered as SQL literals. Use the `sql` template tag for
     * database expressions such as `sql\`now()\``.
     */
    default(expression: ClickHouseDefaultInput): ClickHouseColumnBuilder;
    /**
     * Wraps this column type in `Nullable(...)`.
     */
    nullable(): ClickHouseColumnBuilder;
    /**
     * Wraps this column type in `LowCardinality(...)`.
     */
    lowCardinality(): ClickHouseColumnBuilder;
    /**
     * Materializes the builder into a named column definition for a table AST.
     */
    build(name: string): ClickHouseColumnDefinition;
    /**
     * Returns the underlying type AST for nested type builders.
     */
    toColumnType(): ClickHouseColumnType;
}
/**
 * Factory helpers for common ClickHouse column types.
 *
 * Examples:
 * `column.String().default('pending')`, `column.Nullable('String')`,
 * `column.DateTime('UTC')`.
 */
export declare const column: {
    Raw: (type: string) => ClickHouseColumnBuilder;
    Int8: () => ClickHouseColumnBuilder;
    Int16: () => ClickHouseColumnBuilder;
    Int32: () => ClickHouseColumnBuilder;
    Int64: () => ClickHouseColumnBuilder;
    Int128: () => ClickHouseColumnBuilder;
    Int256: () => ClickHouseColumnBuilder;
    UInt8: () => ClickHouseColumnBuilder;
    UInt16: () => ClickHouseColumnBuilder;
    UInt32: () => ClickHouseColumnBuilder;
    UInt64: () => ClickHouseColumnBuilder;
    UInt128: () => ClickHouseColumnBuilder;
    UInt256: () => ClickHouseColumnBuilder;
    Float32: () => ClickHouseColumnBuilder;
    Float64: () => ClickHouseColumnBuilder;
    Decimal: (precision: number, scale: number) => ClickHouseColumnBuilder;
    Bool: () => ClickHouseColumnBuilder;
    Boolean: () => ClickHouseColumnBuilder;
    String: () => ClickHouseColumnBuilder;
    FixedString: (length: number) => ClickHouseColumnBuilder;
    Date: () => ClickHouseColumnBuilder;
    Date32: () => ClickHouseColumnBuilder;
    DateTime: (timezone?: string) => ClickHouseColumnBuilder;
    DateTime64: (precision: number, timezone?: string) => ClickHouseColumnBuilder;
    UUID: () => ClickHouseColumnBuilder;
    IPv4: () => ClickHouseColumnBuilder;
    IPv6: () => ClickHouseColumnBuilder;
    JSON: () => ClickHouseColumnBuilder;
    LowCardinality: (inner: NestedColumnTypeInput) => ClickHouseColumnBuilder;
    Nullable: (inner: NestedColumnTypeInput) => ClickHouseColumnBuilder;
};
export {};
//# sourceMappingURL=column.d.ts.map