"Encountering an error searching for the chai module in the node modules folder even though

Attempting to install chai through the command line, I used the following command.

 npm install --save-dev chai

After that, I attempted to run my unit test class with the specified imports:

import {assert} from 'chai';
import {expect} from 'chai';

However, it resulted in the following errors:

test\main\MessageBroker.spec.ts(3,22): error TS2307: Cannot find module 'chai'.
[05:38:45] [Typescript] TypeScript error: test\main\MessageBroker.spec.ts(3,22): error TS2307: Cannot find module 'chai'.
test\main\MessageBroker.spec.ts(4,22): error TS2307: Cannot find module 'chai'.
[05:38:45] [Typescript] TypeScript error: test\main\MessageBroker.spec.ts(4,22): error TS2307: Cannot find module 'chai'

I'm wondering what mistake I might be making here. The chai folder is present inside the node_modules directory.

Interestingly, using var chai = require('chai'); seems to work fine! Why isn't the import statement working as expected?

javascripttypescriptnpmchainode-modules

Answer №1

In my TypeScript code, I opted not to install the DefinitelyTyped typing for chai and instead installed it as a node module. This meant that I had to call it using a require statement.

 var chai = require('chai');

Answer №2

It is likely that you are utilizing a tool such as Babel in the background to transpile your code to ES5.

In this scenario, it seems to be utilizing require in a Node-like, CommonJS manner.

To make it work, try adding ./ to the path just like we typically do in CommonJS.

Feel free to test this out and see if it resolves your problem:

import {assert} from './chai';
import {expect} from './chai';

Answer №3

Surprisingly, this issue can be resolved simply by installing the necessary types. I found it odd, but it did the trick for me. Why not give it a shot:

npm i --save-dev @types/chai

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