TS2347: Type arguments cannot be used with untyped function calls

In my bar.ts file, I have the following declarations:

declare var angular:any;
declare var _:any;
declare var $:any;
declare var moment:any;
declare var ng:any;
declare var require:any;

And in my bootstrap.ts file, I reference the necessary typings:

/// <reference path="./node_modules/@types/angular/index.d.ts" />
/// <reference path="./node_modules/@types/lodash/index.d.ts" />
/// <reference path="bar.ts" />
.............

However, when I try to use the '_' function like this:

this.csSubtitle = _.get<string>(_.find(this.csRadios, { value: this.csRadioValue }), 'label');

I encounter the following error:

error TS2347: Untyped function calls may not accept type argument

Answer №1

The occurrence of this issue was likely due to attempting to retrieve type information while also using an import directive, making the use of require on its own insufficient in this context.

Let's consider the scenario where you have

var Promise = require('es6-promise').Promise;

To correct this, try:

import es6PromiseLib = require('es6-promise');
var Promise = es6PromiseLib.Promise;

Typically, utilizing type arguments ensures type safety, so it is beneficial to specify them in your code.

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