Ts-jest: Unexpected import inside nodejs module

[mikeyakymenko]

Have a typescript project with installed nodejs module.

MyModule:

import * as formatter from 'nodejs-formatter' // means custom module in /node_modules/

imports in test file:

import {MyModule} from '../../app/modules/MyModule' // menas .ts

discribe('some test', () => {...})

message from console:

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.

Details of error:

Details:

    /Users/michael.y/workspace/projects/yggdrasil-boost-ui/node_modules/nodejs-formatter/src/index.js:2
    import * as strings from './strings'
           ^

    SyntaxError: Unexpected token *

      1 | import SomeService from './SomeService'
      2 | import * as formatter from 'nodejs-formatter'
    > 3 | import {someFunc} from './someFunc'

i've tried specify ignorance like this in package.json "jest" section :

...
"transformIgnorePatterns": ["node_modules/(?!nodejs-formatter)"],
...

but I always have this error. One thing, when I've specify transform for JS throw "^.+\\.js?$": "<rootDir>/node_modules/babel-jest", import works, but have an other error, plugins in .babelrc inside of module fails...

I can't fix the library which I use, so how I can fix it in ts-jest?

[mikeyakymenko]

Solve it:

Just added .babelrc

{
  "presets": [["env", {"modules": false}]],
  "env": {
    "test": {
      "plugins": ["transform-es2015-modules-commonjs"]
    }
  }
}

[mikeyakymenko]

Problem still exist, but little bit different, if just import module, it's ok, if use module, error again.

[mikeyakymenko]

Finally I solve issue. First of all, it can be used without .babelrc, but for some reason if I want include some library in test file, without .babelrc doesn't work. But for avoid error in module which used npm package works another things:

config.json where node-module is some abastract module (just for an examlpe):

"jest": {
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js"
    ],
    "transform": {
      "^.+\\.js$": "babel-jest",
      "^.+\\.(ts|tsx)$": "ts-jest"
    },
    "globals": {
      "ts-jest": {
        "tsConfigFile": "tsconfig.jest.json"
      }
    },
    "testMatch": [
      "**/tests/**.test.+(ts|tsx|js)"
    ],
    "transformIgnorePatterns": [
      "<rootDir>/node_modules/(?!node-formatter)"
    ],
    "moduleNameMapper": {
      "node-formatter": "<rootDir>/node_modules/node-formatter"
    }
  }

tsconfig.test.json:

{
  "compilerOptions": {
    "outDir": "./dist/",
    "noImplicitAny": false,
    "sourceMap": false,
    "module": "commonjs",
    "lib": [
      "es6",
      "dom"
    ],
    "target": "es5",
    "allowJs": true,
    "moduleResolution": "node"
  }
}