jest-namespace-imports-transformer

This package contains a jest transformer that transforms *.ts and *.js files by replacing es6 namespace imports with named imports.

It is meant to be used a temporary workaround for the jest-preset-angular issue: https://github.com/thymikee/jest-preset-angular/issues/963

Rationale

jest-preset-angular messes up constructors that are imported under a namespace (like import * as Apollo from 'apollo-angular'). While the easiest workaround would be not to use namespace imports at all, it's not always achievable due to usage of 3rd party code generators (like graphql-code-generator).

How to use

Inside your jest.config.js add this:

transform: {
  '^.+\\.(ts|js|html)$': 'jest-namespace-imports-transformer',
},

Known issues

jest-namespace-imports-transformer makes its own code transformations, and afterwards applies NgJestTransformer transformations. In cases where a different transformer has been used originally, this might cause issues. Unfortunately, it seems like jest does not support a way to specify multiple transformers for the same files, so we ended up hardcoding NgJestTransformer.

Running unit tests

Run npm test to execute the unit tests. Note that you need to have jest installed.