Using Jest I get: Cannot find type definition file for 'jasmine'

Question

I am using Angular 7 and Jest. When I was running jest with --codecoverage, all my tests passed but many branches in the constructor were not covered (similar to: B

Answer 1

I was getting the following error when trying to run Jest in my Angular project.

TypeScript diagnostics (customize using [jest-config].globals.ts-jest.diagnostics option): error TS2688: Cannot find type definition file for 'jquery'. error TS2688: Cannot find type definition file for 'jsdom'.

For me I had to add the type definition packages.

yarn add @types/jquery @types/jsdom --dev

After that these errors stopped.