import { NgForOf } from '@angular/common';
import { DoCheck, OnChanges, SimpleChanges } from '@angular/core';
export declare class NgForIn extends NgForOf<string> implements DoCheck, OnChanges {
    ngForIn: {
        [key: string]: any;
    } | Map<string, any> | null;
    private previousKeys;
    ngOnChanges(changes: SimpleChanges): void;
    ngDoCheck(): void;
    private keysOf;
}