/**
 * ColumnDefinition for `@atlex/orm` migrations.
 *
 * Provides a fluent chainable API (nullable, defaultTo, unique, index, unsigned, primary)
 * similar to common migration column modifiers.
 */
export interface ColumnModifier {
    kind: 'nullable' | 'default' | 'useCurrent' | 'unique' | 'index' | 'primary' | 'unsigned';
    value?: unknown;
    name?: string;
}
/** Marker returned by `Blueprint.raw()` for SQL default expressions. */
export interface RawSqlExpression {
    readonly __atlexRawSql: string;
}
export declare function isRawSqlExpression(value: unknown): value is RawSqlExpression;
export declare class ColumnDefinition {
    readonly name: string;
    readonly type: string;
    readonly args: readonly unknown[];
    readonly modifiers: ColumnModifier[];
    constructor(name: string, type: string, args?: readonly unknown[]);
    /**
     * Mark the column nullable.
     *
     * @returns this
     * @example
     * table.string('email').nullable()
     */
    nullable(): this;
    /**
     * Knex-compatible alias; columns are NOT NULL unless `.nullable()` is called.
     */
    notNullable(): this;
    /**
     * Set a default value.
     *
     * @param value - Default value.
     * @returns this
     * @example
     * table.boolean('active').defaultTo(true)
     */
    defaultTo(value: unknown): this;
    /**
     * Set the default to the database "now" (e.g. PostgreSQL `CURRENT_TIMESTAMP`).
     * Prefer this over `defaultTo(new Date())`, which can stringify with a locale
     * timezone label and break drivers such as PostgreSQL.
     *
     * @returns this
     */
    useCurrent(): this;
    /**
     * Create a unique index.
     *
     * @param name - Optional index name.
     * @returns this
     * @example
     * table.string('email').unique()
     */
    unique(name?: string): this;
    /**
     * Create a non-unique index.
     *
     * @param name - Optional index name.
     * @returns this
     * @example
     * table.integer('user_id').index()
     */
    index(name?: string): this;
    /**
     * Mark as primary key.
     *
     * @returns this
     * @example
     * table.bigIncrements('id').primary()
     */
    primary(): this;
    /**
     * Mark the column unsigned (where supported).
     *
     * @returns this
     * @example
     * table.integer('age').unsigned()
     */
    unsigned(): this;
}
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