import * as ts from "typescript";
import { AddedWalker } from "./added-walker";
export declare class UsedWalker extends AddedWalker {
    usedObservables: {
        [key: string]: ts.Node[];
    };
    usedOperators: {
        [key: string]: ts.Node[];
    };
    usedPrototypeMethods: {
        [key: string]: ts.Node[];
    };
    usedStaticMethods: {
        [key: string]: ts.Node[];
    };
    protected visitCallExpression(node: ts.CallExpression): void;
}