[SOLVED] How to resolve 'Assertions require every name in the call target to be declared with an explicit type annotation.ts(2775)'?

Issue

I have the JavaScript code below, and I’m using the TypeScript Compiler (TSC) to provide type-checking as per the Typescript Docs JSDoc Reference.

const assert = require('assert');
const mocha = require('mocha');

mocha.describe('Array', () => {
    mocha.describe('#indexOf()', () => {
        mocha.it('should return -1 when the value is not present', 
        /** */
        () => {
            assert.strictEqual([1, 2, 3].indexOf(4), -1);
        });
    });
});

I’m seeing this error:

Assertions require every name in the call target to be declared with an explicit type annotation.ts(2775)
SomeFile.test.js(2, 7): 'assert' needs an explicit type annotation.

How can I resolve this error?

Solution

You need to add a JSDoc type annotation for your assert variable such as in the example below. You can add a more specific type than {any} if you like.

/** @type {any} */
const assert = require('assert');

See this Github issue for more info.

Answered By – derekbaker783

Answer Checked By – Willingham (BugsFixing Volunteer)