Infer types from type alias statements

[rjbailey]

Flow allows declaring object types with a type alias statement:

/**
 * A 2D point.
 */
type Point = { x: number, y: number };

It would be convenient if property names and types could be inferred from this statement in the same way that they are inferred from function parameters, generating docs as if those properties had been declared with the @property tag.

[tmcw]

👍 Sounds like inferring a @typedef from this tag is the appropriate way: I can do this.