How to solve webpack 2 error ,module build failed:SyntaxError,,?

I cloned this reactjs/webpack2 repo:

which is working great , but I was playing around and chaned the index.js file with some properties/spread:

 let myprops = [1,2];
 let copyprops = {...myprops};

When I run npm start I get a build error:

Module build failed: SyntaxError: .../index.js:Unexpected token

It is referring to the line with the spread operator, how can I fix this? see also: repo

Solution

If you haven't changed the presets that are included in that repo then the spread operator won't work as you're noticing.

The spread operator is actually a part of the stage2 preset. You can find more info on that here https://github.com/babel/babel-loader/issues/170

So in order for your code to work you'll need to make sure you've both installed the babel-preset-stage-2 and set it as a preset in your .babelrc