feat: find apollo client instance on embedded iframes #828
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Per #380.
This PR adds discovery support for apollo client instances in same-origin iframes. It does so by looking through any embedded iframes and looking for window.APOLLO_CLIENT instances therein.
I also added an iframe.html file to the client repo to test and validate the behavior; committing it may be overkill since it's not core functionality but willing to get feedback on that. Can verify by starting the local app with
npm run start:devand navigating to localhost:3000/iframe.html, which will load the demo app in an iframe.