Use webgl-debug in debug mode

[vorg]

Using https://www.npmjs.com/package/webgl-debug would allow use to catch invalid enums and other gl errors.

[dmnsgn]

Is there any advantage over the current checkError()?

[vorg]

Yes it checks for invalid enums and parameters of function calls. So you can catch error when it happens not at some point in the future or end of frame.