Uncaught ReferenceError: y is not defined (Production)

[chris-m92]

When in development environment, the VectorBasemapLayer works as advertised. I am able to select the different basemaps to include with and without labels.

However, once in production environment, I am only getting the base layers with no overlays on top (labels, coloring, etc...).
The Dev console throws an uncaught reference error that y is not defined.

[chris-m92]

Turns out from this issue, the issue is actually from package.json. Specifically, the browserslist.production. By default, CRA includes >0.2%, not dead, not op_mini all. However, changing that to defaults, not op_mini all fixed the issue.