Meteor malfunctioned out of the blue with a host of errors

I was working on my Meteor app as I always do. Then after I saved my file (I’m using React with Meteor), I get the following error horror show in my console:

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I honestly have no idea what went wrong. The first line is a var error, but my app contains no var declarations at all. I only use const and let. To be honest, I don’t know what caused the error and in my terminal, there is no error message at all. It only shows in the console when I try to start Meteor back up.

Any help on this would be appreciated.