ts-jest does not recognize es6 imports

I eventually found out what the problem was. It turns out it was there in ts-jest’s README all the time.

There’s a section in the README titled Using ES2015+ features in Javascript files. In these cases, you need to instruct jest to use babel-jest as a transform for .js files.

"jest": {
  "transform": {
    "^.+\\.jsx?$": "babel-jest", // Adding this line solved the issue
    "^.+\\.tsx?$": "ts-jest"
  },
  // ...
},