/// <reference types="cheerio" />
import { Tree } from '@angular-devkit/schematics/src/tree/interface';
import { Observable } from 'rxjs';
import { TransformCallback } from './rx.tree';
/**
 * Reads an HMTL from the tree and then transforms it using the given function. If the result
 * is null or undefined, the file will be deleted, else replaced or created.
 *
 * @param aName   name of the file
 * @param aOp     the operator
 * @param aTree   the tree to work in
 */
export declare function rxTransformHtmlFile(aName: string, aOp: TransformCallback<CheerioStatic>, aTree: Tree): Observable<string>;