Created
          October 2, 2017 07:36 
        
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    Service Worker gotchas – https://medium.com/kollegorna/service-worker-gotchas-af20a9dab986
  
        
  
    
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  | if('serviceWorker' in navigator) { | |
| navigator.serviceWorker.register('/serviceworker.js'); | |
| if(navigator.serviceWorker.controller) { | |
| navigator.serviceWorker.controller.postMessage({'command': 'trimCache'}); | |
| } | |
| } | 
  
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