I am getting a javascript error
"missing = in destructuring declaration"
What could be the problem?
This is not a standard javascript error. It's coming from your editor. You must be using the js2-mode (Javascript mode) for your Emacs editor. This could be a missing equals in for loop. Example:
for(i 0; i < arr.length;i++); /* missing = in destructuring declaration */
However, without looking at your code, we can only guess.