Define query while declaring

[trivikr]

Issue #, if available:
Similar to #175

Description of changes:

Before

const query: any = {
  foo: "bar"
};
if (input.baz !== undefined) {
  query["baz"] = input.baz;
}
if (input.maybeSet !== undefined) {
  query["maybeSet"] = input.maybeSet;
}

After

const query: any = {
  foo: "bar",
  ...(input.baz !== undefined && { baz: input.baz }),
  ...(input.maybeSet !== undefined && { maybeSet: input.maybeSet })
};

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