The error message "THREE is not defined" occurred while running mocha tests for a

I am attempting to execute a basic Mocha unit test for code that utilizes the Vector3 class from THREE.js:

import {Vector3} from 'three';
const a = new Vector3(0, 0, 0);

When running this test using Mocha (specifically mocha-webpack, with webpack targeting 'node' instead of 'web'), I encounter the following error:

RUNTIME EXCEPTION  Exception occurred while loading your tests
ReferenceError: THREE is not defined

It's puzzling because I haven't referenced the name THREE in my test code. THREE is actually a (global?) object defined within the source code of three.js, but for some reason, it's not accessible now. How can I modify the test code above to make it functional?

javascriptthree.jsmocha.js

Answer №1

The issue arose due to the inclusion of "three" in the "externals" section of the webpack setup. Successfully resolving the problem involved removing all external dependencies from the webpack configuration file.

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