[Webkit-unassigned] [Bug 198263] New: Can't find variable: caches

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198263

            Bug ID: 198263
           Summary: Can't find variable: caches
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Service Workers
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shader.yang at gmail.com

Created attachment 370663

  --> https://bugs.webkit.org/attachment.cgi?id=370663&action=review

Screenshot from Safari Debugger

I just tested if cachestorage object on iOS Safari and WKWebView, but I was told caches variable wasn't there, could you tell me is it a bug or work as design with something I don't know?

I think it is a major issue, because it causes SW/CacheStorage cannot be used at all!

Following is the code snippet:
      caches.match(url).then(function (response) {
        if (response) {
          parseResponse(response.clone(), type, cb);
        } else {
          fetchRes(url, type, cb);
        }
      }).catch(function () {
        console.log("get cacheStorage err by download");
      });


Thanks!

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