import { ColumnType } from "../Common/ColumnType";
import { GenericType, ColumnGeneration } from "../Common/Type";
import { IColumnMetaData } from "./Interface/IColumnMetaData";
import { IEntityMetaData } from "./Interface/IEntityMetaData";
import { FunctionExpression } from "../ExpressionBuilder/Expression/FunctionExpression";
import { IColumnOption } from "../Decorator/Option/IColumnOption";
export declare class ColumnMetaData<TE = any, T = any> implements IColumnMetaData<TE, T> {
    entity: IEntityMetaData<TE>;
    propertyName?: keyof TE;
    columnName: string;
    nullable: boolean;
    _defaultExp?: FunctionExpression<T>;
    readonly defaultExp: FunctionExpression<T>;
    private _default?;
    default: () => T;
    description: string;
    columnType: ColumnType;
    type: GenericType<T>;
    collation: string;
    charset: string;
    isReadOnly: boolean;
    isProjected: boolean;
    generation?: ColumnGeneration;
    readonly isPrimaryColumn: boolean;
    constructor(type?: GenericType<T>, entityMeta?: IEntityMetaData<TE>);
    applyOption(columnMeta: IColumnOption<T> | IColumnMetaData<TE, T>): void;
}