import { BaseSopOperation } from './_Base';
import { CoreGroup } from '../../geometry/Group';
import { DefaultOperationParams } from '../_Base';
import { InputCloneMode } from '../../../engine/poly/InputCloneMode';
interface NullSopParams extends DefaultOperationParams {
}
export declare class NullSopOperation extends BaseSopOperation {
    static readonly DEFAULT_PARAMS: NullSopParams;
    static readonly INPUT_CLONED_STATE = InputCloneMode.FROM_NODE;
    static type(): Readonly<'null'>;
    cook(input_contents: CoreGroup[], params: NullSopParams): CoreGroup;
}
export {};