import { Tree } from '@angular-devkit/schematics';
import { Observable } from 'rxjs';
export interface TransformWithPath<T> {
    (aSource: T | undefined, aPath: string): Observable<T | undefined>;
}
export interface TransformWithoutPath<T> {
    (aSource: T | undefined): Observable<T | undefined>;
}
export declare type TransformCallback<T> = TransformWithPath<T> | TransformWithoutPath<T>;
/**
 * Reads a text file 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 rxTransformTextFile(aName: string, aOp: TransformCallback<string>, aTree: Tree): Observable<string>;
/**
 * Reads a JSON file 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 rxTransformJsonFile(aName: string, aOp: TransformCallback<any>, aTree: Tree): Observable<string>;
/**
 * Reads a line based file 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 rxTransformLinesFile(aName: string, aOp: TransformCallback<string[]>, aTree: Tree): Observable<string>;