import { Observable } from "rxjs";
import { NgIterable } from "@angular/core";
import { DataSource } from "@angular/cdk/collections";
import { CdkVirtualForOf } from "@angular/cdk/scrolling";
import * as i0 from "@angular/core";
export declare class CdkVirtualForOfDirective<T> {
    private cdkVirtualFor;
    cdkVirtualForOf?: DataSource<T> | Observable<T[]> | NgIterable<T> | null;
    set cdkVirtualForTrackByProp(prop: keyof T);
    constructor(cdkVirtualFor: CdkVirtualForOf<T>);
    static ngTemplateContextGuard<T>(dir: CdkVirtualForOfDirective<T>, ctx: unknown): ctx is {
        $implicit: T;
        index: number;
    };
    static ɵfac: i0.ɵɵFactoryDeclaration<CdkVirtualForOfDirective<any>, [{ self: true; }]>;
    static ɵdir: i0.ɵɵDirectiveDeclaration<CdkVirtualForOfDirective<any>, "[cdkVirtualFor]", never, { "cdkVirtualForOf": "cdkVirtualForOf"; "cdkVirtualForTrackByProp": "cdkVirtualForTrackByProp"; }, {}, never, never, false>;
}