typescript-react-error

This project tries to reproduce a strange behavior when you try to run a *.js test of *.ts file which has an uncompiled dependency. (See: issue #970 of the ts-jest github page).

How to reproduce

• Install the dependencies:

      npm i
  

• Run the tests:

      npm test
  

• Now you will see this error output on your console:

  FAIL  src/index.test.js
  Test suite failed to run
  
  Jest encountered an unexpected token
  
  This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
  
  By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
  
  Here's what you can do:
  • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
  • If you need a custom transformation specify a "transform" option in your config.
  • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
  
  You'll find more details and examples of these config options in the docs:
  https://jestjs.io/docs/en/configuration.html
  
  Details:
  
  C:\Users\dalfonso\Playground\typescript-react-error\node_modules\arlas-web-core\index.js:19
  export { CollaborativesearchService } from './services/collaborativesearch.service';
  ^^^^^^
  
  SyntaxError: Unexpected token export
  
  > 1 | import { CollaborativesearchService } from 'arlas-web-core';
      | ^
  2 | import { Configuration } from 'arlas-api';
  3 |
  4 | export class Test {
  
  at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/ScriptTransformer.js:440:17)
  at Object.<anonymous> (src/index.ts:1:1)
  at Object.<anonymous> (src/index.test.js:1:1)
  
  Test Suites: 1 failed, 1 total
  Tests:       0 total
  Snapshots:   0 total
  Time:        18.445s
  Ran all test suites.
  

Branching strategy

• master:

  This branch contains all the latest version of the dependencies, including the jest 24, which is not currently supported by ts-jest right now.

• babel-6-compatibility:

  This branch downgrade the jest library to the 23 version, which makes necessary to install a babel-core bridge to make this working as this jest version doesn't support babel 7. The purpose of this separate branch is to prove that the error happens even if you work with a compatible version of jest with ts-jest.

• typescript-tests:

  The purpose of this branch is to try to avoid as much explicit babel dependencies as possible.