declare function makeEmptyFunction(arg: any): () => any; declare function emptyFunction(): void; declare namespace emptyFunction { var thatReturns: typeof makeEmptyFunction; var thatReturnsFalse: () => any; var thatReturnsTrue: () => any; var thatReturnsNull: () => any; var thatReturnsThis: () => undefined; var thatReturnsArgument: (arg: any) => any; } export default emptyFunction;