import { PipeTransform } from '@angular/core';
import { NzxConfigKey } from '@winkong/ng-zorro-antd-extension/core/config';
import * as i0 from "@angular/core";
export declare class NzxSafeNullPipe implements PipeTransform {
    readonly _nzModuleName: NzxConfigKey;
    placeholder: string;
    private nzxConfigService;
    transform(value: any, placeholder?: string): string;
    static ɵfac: i0.ɵɵFactoryDeclaration<NzxSafeNullPipe, never>;
    static ɵpipe: i0.ɵɵPipeDeclaration<NzxSafeNullPipe, "nzxSafeNull", false>;
}