Istanbul: Transformation error; return original code. Unexpected token ...

[chuksynaza]

After trying to merge objects in my code using:

this.config = { ...defaultConfig, ...config };

I get the error:

Transformation error; return original code

Unexpected token ...

And test coverage is not reported for that file. If that line is commented then test coverage is reported and the error goes away.

[jcollum-nike]

Same here. My version is "istanbul": "^0.4.5", (latest non-alpha)

✗ node --version
v8.15.0

[chuksynaza]

This package is now deprecated and doesn't support ES6. Use nyc - instanbul.js.org. It works with the babel-plugin-instanbul and has full class support for ES6.

It is also very easy to setup

$ npm install --save-dev nyc

Then in your package.json

{
  "scripts": {
    "test": "nyc mocha"
  }
}

Happy coding :smile:

[jcollum-nike]

It would be helpful if that deprecation warning was right at the top of the readme -- as in big bold letters -- along with this suggestion for an alternate.