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I'm trying to check if the storage is empty, but it gives an error saying data needs to be set before it can even get from the storage. 

chrome.storage.sync.get('pos', function(r){
   if (typeof r.pos === undefined ){

      }
    })

edit: The error I get is: Invocation of form get(string) doesn't match definition get(optional string or array or object keys, function callback) at normalizeArgumentsAndValidate (extensions::schemaUtils:112:11) at StorageArea.self.(anonymous function) [as get] (extensions::StorageArea:35:14) at chrome-extension://lqhqq.....

here is a similar question: Making an Array in chrome.storage and retrieving data

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