[relay-compiler] Correctly type empty variables in TypeScript #4404
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Previously the compiler produced
{}
for empty objects in TypeScript. This is for example the case for the...$variables
type, if no variables are present.The problem is that
{}
does not mean "empty object" in TypeScript. It means "any value except null and undefined".Because of this you're able to input anything besides those two values as variables for an operation without variables.
I opted to produce the more appropriate
Record<PropertyKey, never>
, which effectively represents an object without properties.