Use spread operator to override values (fixes #114)

[emab]

This PR implements a new way of generating mock types. Instead of relying on checking overrides for a specific property name, we instead just spread any provided overrides over the key:value object of field to value.

In my opinion this has a couple of benefits:

• Easier to read. There's less going on per line - it's clear what the generated value is.
• Eslint may encourage you to not use .hasOwnProperty
• Don't need to use ! to satisfy TypeScript

I've updated all tests, and looking through the snapshots looks positive!

[emab]

Looks good, but I the history a little and we actually did this implementation at first Then we switched to hasOwnProperty to fix a recursive issue #9

Not sure if this issue will cause a problem now we have relationshipsToOmit handling ... ? What do you think?

Yeah that is a good point actually. This method will call the mock data function and then apply overrides. That mock function would then cause a recursive call as it would also call the previous function again, if we don't provide a way to terminate.

I think this would mean the config option to turn on protection for circular relationships would have to be enabled at all times, otherwise it would cause a breakage. I wonder how often people disable it?

[stale[bot]]

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