GA Mutates properties object

[intellix]

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I'm submitting a ...

• [x] bug report

• [ ] feature request

• [ ] question about the decisions made in the repository

• What is the expected behavior?

const input = { id: 1 };
this.angulartics.eventTrack.next({
  action: 'sell',
  properties: input,
});
console.log(input); // { id: 1 }
this.apollo.mutate({ mutation, variables: { input } })

• What is the motivation / use case for changing the behavior?

Using angulartics shouldn't unexpected mutate the properties you pass in. I'm using GraphQL and was passing in my mutation input directly and now I get this error:

Variable "$input" got invalid value { id: "Qm94OjIw", action: "sell", category: "Event" }; Field "category" is not defined by type PurchaseBoxInput.

It's mutating the original object unexpectedly. Obviously I can get around it by { ...input } but nobody expects a tracking lib to mutate the original object

https://github.com/angulartics/angulartics2/blob/6e5c886ee8c28b778ee4c03bd1dd955cc8bda8a1/src/lib/providers/ga/ga.ts#L97