referenceerror left side of assignment is not a reference

IMAGES

1. JavaScript ReferenceError

   

2. Assigning process.env.NODE_ENV -> "SyntaxError: Left side of assignment

   

3. javascript

   

4. Что означает ошибка ReferenceError: Invalid left-hand side in

   

5. JavaScript ReferenceError

   

6. Referenceerror invalid assignment left-hand side