Cypress+Firestore=invalid data
Function DocumentReference.set() called with invalid data. Data must be an object, but it was: a custom Object object
not work
firebase.firestore().collection("foo").doc("bar").set({})
hacks also don't work
Object.assign({}, obj)
JSON.parse(JSON.stringify(obj))
correct insight
This is likely a cross-window issue: GWT code runs in an iframe; if Firebase is looking for a "bare object", it likely compares the object's constructor, which won't be the expected one if the object crosses the iframe boundary.
https://stackoverflow.com/questions/46620162/firestore-web-code-sample-gives-invalid-argument-type
Cypress also uses iframes. So we can't store objects created in testcases.
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