Just tried mobservable in my project, though ran into this issue:

Module build failed: SyntaxError:
Decorators are not supported yet in 6.x pending proposal update.

  20 | 
  21 | @observer
> 22 | class TimerView extends Component {
     | ^
  23 |   render() {
  24 |     return (
  25 |       <button onClick={this.onReset}>

Here is my .babelrc:

{
  "presets": [
    "react",
    "es2015",
    "stage-1"
  ],
  "env": {
    "development": {
      "presets": [
        "react-hmre"
      ]
    }
  }
}