"toMatchGraphObjectSchema" generates an invalid JSON schema when using _class with duplicate "required" properties

[austinkelleher]

The Disk class acts as an alias to the DataStore class, which means that they have duplicate required properties. Duplicate required properties in JSON schema is invalid as are duplicate property type's. We need to ensure that we deduplicate values in required and type.

Example:

const data = {
  _class: ['DataStore', 'Disk'],
 ...
}

toMatchGraphObjectSchema(data, {
  _class: ['DataStore', 'Disk'],
  ...
});

Throws the following error:

schema is invalid: data.required should NOT have duplicate items (items ## 13 and 6 are identical)