React code fail in production due to the use of the "of" operator 

<img width="1440" alt="Screenshot 2020-04-16 at 19 05 04" src="https://user-images.githubusercontent.com/3681571/79485593-c5d59980-8015-11ea-9b1f-260338a4e969.png">
// original react code


// minified code
var c, u = [],
d = Object(kt.a)(t); 

// original react code
for (const keyword of trackedKeywords) { }