←  offliner-source-cache.js
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How to write an offline source
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Remember including offliner will export the off module with a namespace reserved for sources. Put your source inside.
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A source is a function that will be passed with a request and the active offline cache. The source must return a promise resolving with the proper response or rejecting when response is not available.

 
self.off.sources.cache = function (request, activeCache) {
  return activeCache.match(request).then(function (response) {
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Notice how we resolve with the response if there is a match in the cache of reject otherwise.

 
    return response ? Promise.resolve(response) : Promise.reject();
  });
};