[wp-trac] [WordPress Trac] #42163: Customize: Add support for previewing requests made via the Fetch API

[WordPress Trac]

#42163: Customize: Add support for previewing requests made via the Fetch API
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 Reporter:  westonruter   |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  4.9.1
Component:  Customize     |    Version:
 Severity:  normal        |   Keywords:
  Focuses:  javascript    |
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 The Customizer preview supports applying the customized state to Ajax
 requests via `jQuery.prefilterAjax`. However, if a frontend is not using
 jQuery but rather the Fetch API then the customized state will not be
 injected into the request in order to have the customized state applied to
 the response. In the same way that `customize-preview.js` is wrapping
 `history.replaceState()` and `history.pushState()` to inject the
 customized state, we should also wrap `fetch()` to do the same. We may
 also want to do this for `XMLHttpRequest` as well.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42163>
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