The Jest test is experiencing a failure as a result of an imported service from a .ts file

In my Jest test file with a .spec.js extension, I am importing an index.js file that I need to test.

Here is the code snippet from the .spec.js file:

var HttpService = require('./index.js').HttpService;

The problem arises because the index.js file imports a .ts file that contains errors. Although this doesn't affect the project directly (and I cannot modify the .ts file), when running my Jest test,

I encounter errors from the imported .ts file!

This is how the index.js file imports the service-factory.ts file:

var service_factory = require('../service-factory.ts');

And here is a snippet from the service-factory.ts file:

import Loglevel from 'loglevel';

The specific errors I face are:

ERROR:

Cannot find module 'loglevel' or its corresponding type declarations
;

window.App.services

ERROR:

Property 'App' does not exist on type 'Window &typeof globalThis'

These errors are triggered when attempting to run my test, pointing back to the .ts file...

If anyone has advice on resolving this issue, it would be greatly appreciated! Thank you

Answer №1

It is quite uncommon for a .js file to include a .ts file directly. The issue appears to lie there. JavaScript can only import Typescript files after they have been transpiled into JavaScript. Check if there is a corresponding .js file available. If not, it may be necessary to compile it first. This error strongly suggests that Typescript is being executed as if it were regular JavaScript.

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