tsconfig.json Adjustments (Less Recommended) 1.Attempt to adjust your tsconfig.json: You could attempt to adjust your tsconfig.json file to try and resolve the conflicts. However, this is generally not recommended, as it can lead to unexpected behavior and make your code less maintainable. 2. typeRoots: Specifically, you could try using typeRoots or types within the tsconfig file, to control how typescript resolves type definitions. However, if the root issue is that you have duplicate global definitions, this will not fully solve the issue. 3. Recommended Approach The cleanest and most maintainable solution is to choose one testing framework (Mocha or Jasmine) and remove the type definitions for the other. This will prevent the type conflicts and make your code easier to understand and maintain.