Tests failing with SyntaxError on import statements

• Issue

After configuring ts-jest all my tests fail with SyntaxError on import statements, even if they didn’t include any typescript modules and were passing before. If I remove the ts-jest config, the tests that don’t import a typescript module passes fine.

    ...\sum.test.js:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import Sum from './sum';
                                                                                             ^^^^^^

    SyntaxError: Unexpected token import

      at transformAndBuildScript (node_modules\jest-runtime\build\transform.js:320:12)

Random thought as I post this, all our tests are written in js and so are most of our components. We have a handful of shared components that are written in typescript. ts-jest should work for this scenario right?

• Expected behavior

Tests that run/pass before configuring ts-jest continue to do so and tests typscript module passes too

• Link to a minimal repo that reproduces this issue

https://github.com/kwilkins/ts-error-example

[kulshekhar]

@kwilkins The js files need to be transpiled for node to understand import. There are two ways you can do this:

• use ts-jest to process js files

    "transform": {
      "^.+\\.(t|j)sx?$": "ts-jest"
    }

• use another transformer to process js files

    "transform": {
      "^.+\\.jsx?$": "<rootDir>/node_modules/babel-jest",
      "^.+\\.tsx?$": "ts-jest"
    }

let me know if this fixes it for you

sidenode: the jest/ts-jest version in the linked repo is too old

[erinknight242]

I am still getting the “Unexpected token import” after updating the transform to include js files (my tests are js but my components are ts/tsx)

Example failure: ` Test suite failed to run

({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import React from 'react';
                                                                                         ^^^^^^

SyntaxError: Unexpected token import

  at ScriptTransformer._transformAndBuildScript (node_modules/jest-runtime/build/script_transformer.js:318:17)`