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.