Tomassito

### Is this a regression? - [ ] Yes, this behavior used to work in the previous version ### The previous version in which this bug was not present was...

style object is mutated by a component it's passed to

1

https://github.com/storybookjs/react-treebeard/blob/36d72f10c35655371d0d0e396128709288bc8b4c/src/components/NodeHeader.js#L34 I believe the 'target' argument should be an object literal here, i.e. Object.assign({}, style, {container: {...style.link, ...style.activeLink}}) Also, see no reason why Object.assign is mixed with the spread syntax...