Intermezzo – NestJS + Jest vs Angular + Jasmine


Bingo is a small project, written in TypeScript , and developed with Alexandru Badita in launch break (one hour - more or less). You can find sources at . Those are my blog posts for Bingo : ( scroll below for the post)
1Create meeting
2Create Tests
3Finalize Create meeting
4Sharing meeting
5Keep Score
6Add obsolete
7Finalizing obsolete
8End meeting
9Dockerize tests
10Azure CI tests
11Yarn workspaces
13Intermezzo - CLI improvements
14typescript compile run with node
15NestJS ,swagger and create a meeting
16Finalizing API
17Intermezzo - jest vs jasmine error
18Refactor WebAPI and test service
19Heroku Deploy NestJs
21Deploy Angular to GitHub
22WebAPI and Web
24Documentation of the code

We decided to add an Angular project.  As a immediate consequence , the compile ( tsc ) of the API ( bingo-cards-api) it failes with the first error being:

../node_modules/@types/jasmine/ts3.1/index.d.ts:16:1 – error TS6200: Definitions of the following identifiers conflict with those in another file: beforeAll, beforeEach, afterAll, afterEach, describe, fdescribe, xdescribe, it, fit, xit, expect, DEFAULT_TIMEOUT_INTERVAL, CustomMatcherFactory, CustomEqualityTester


Obviously, we have a conflict… And the conflict is done by Angular( that comes with Jasmine by default) and Nest ( that comes with Jest) ( and us, that we have choose Jest)


There are 3 solving paths:

  1. Convert all to Jasmine
  2. Convert all to Jest
  3. Eliminate the tests from the Angular , eliminate the tests from Nest and create the own library to test (we have done already this, in bingo-meeting-objects-test)


Solution 1 : means re-factor all. Not good.

I have tried the 2 , but , in spite of many tutorials on the internet, some problems have arrived.

So we have the 3 : eliminate all references to Jest and Jasmine, with the exception of bingo-meeting-objects-test

And… it worked!