UglifyJS error during gulp bundle --ship

One of our projects use the library for querying against sharepoint lists. The project runs ok on dev, but generates a build error once we try to build for production.

steps to reproduce:

1. create new ms spfx project using yoeman generator (webpart, o365 only)
2. npm install linqts --save
3. use library in code

import { List } from 'linqts';
export default class SampleFabric extends React.Component<ISampleFabricProps, {}> {
  public render(): React.ReactElement<ISampleFabricProps> {
    
    let dataList = new List(["a", "b"]);
    ...
}

1. gulp bundle --ship

returns this error:

Error - [webpack] 'dist':
sample-fabric-web-part.js from UglifyJs
Unexpected token: operator (>) [sample-fabric-web-part.js:738,10]

reverting to v1.10.0 (npm install --save-exact linqts@1.10.0) will allow the build to complete.

[kutyel]

Tomorrow I’ll release a new version reestablishing the dist version to es5, should fix this issue and @huserben’s one as well! 😄

[haifoo]

thanks!