/**
 * Column Builder
 *
 * Fluent API for defining columns in migrations.
 */
import type { CanonicalType, ForeignKeyAction } from '../../schema/types.js';
import type { BaseColumnOptions, FullColumnDefinition, IColumnBuilder, IForeignKeyBuilder } from './types.js';
/**
 * Builder for column definitions with a fluent API.
 * Columns are NOT NULL by default (safer).
 */
export declare class ColumnBuilder implements IColumnBuilder, IForeignKeyBuilder {
    private _name;
    private _type;
    private _nullable;
    private _defaultValue?;
    private _primaryKey;
    private _autoIncrement;
    private _unique;
    private _comment?;
    private _index?;
    private _foreignKey?;
    constructor(name: string, type: CanonicalType, options?: BaseColumnOptions);
    /**
     * Make the column nullable or not nullable.
     */
    nullable(value?: boolean): this;
    /**
     * Make the column NOT NULL.
     */
    notNullable(): this;
    /**
     * Set a default value for the column.
     */
    defaultValue(value: unknown): this;
    /**
     * Mark as primary key.
     */
    primaryKey(): this;
    /**
     * Enable auto-increment (for integer types).
     */
    autoIncrement(): this;
    /**
     * Add a unique constraint.
     */
    unique(): this;
    /**
     * Add a comment to the column.
     */
    comment(text: string): this;
    /**
     * Add an index on this column.
     * @param name - Optional index name. If true, auto-generates name.
     */
    index(name?: string): this;
    /**
     * Set as unsigned (MySQL/MariaDB).
     */
    unsigned(): this;
    /**
     * Add a foreign key reference.
     * Returns a ForeignKeyBuilder for additional options.
     */
    references(table: string, column?: string): IForeignKeyBuilder;
    /**
     * Set ON DELETE action for foreign key.
     */
    onDelete(action: ForeignKeyAction): this;
    /**
     * Set ON UPDATE action for foreign key.
     */
    onUpdate(action: ForeignKeyAction): this;
    /**
     * Build and return the column definition.
     */
    build(): FullColumnDefinition;
}
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