import { UpdateCommandInput } from '@aws-sdk/lib-dynamodb';
import { Key, DocumentItem, Operation } from './types';
export declare class Expression<T extends DocumentItem> {
    #private;
    private initFields;
    constructor(initFields: Partial<T>);
    generate(table: string, key: Key<T>, ope: Operation<T>, withInit?: boolean): UpdateCommandInput;
    _reset(): void;
    _addSet(name: string, val: any, init: boolean): void;
    _addAdd(name: string, val: any, init: boolean): void;
    _addPushSet(name: string, val: any, init: boolean): void;
    _addRemove(name: string): void;
    _addDelete(name: string, val: any): void;
    _addInitSet(name: string, val: any): boolean;
    _regName(name: string): string;
    _regVal(val: any): number;
    _geneInits(): void;
    toExpression(): string;
    private isEmpty;
    private createSet;
}
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