support inlined process.env.DEBUG #983
                
     Open
            
            
          
      
        
          +6
        
        
          −3
        
        
          
        
      
    
  
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
Some browser-like environments do not support localStorage nor process.env, but can be provided environment variables because they automatically get inlined (i.e. process.env.XYZ gets replaced by whatever value XYZ is during a build step). This change supports this scenario without breaking previous behavior.
As additional context, I am running into issues when trying to use debug in a Shopify POS extension. These extensions run in a sandboxed version of JS that lacks many built-ins like localStorage. Shopify's build step automatically inlines environment variables, but this still failed because
processwould not be defined, which the previous code required