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//• If e is a FunctionExpression or ArrowFunctionExpression with no type parameters and no parameter or return type annotations, and T is a function type with EXACTLY ONE non - generic call signature, then any inferences made for type parameters referenced by the parameters of T’s call signature are fixed(section 4.12.2) and e is processed with the contextual type T, as described in section 4.9.3.
var f2: {
(x: string, y: number): string;
<T, U>(x: T, y: U): T
};
f2 = (x, y) => { return x }
var f3: {
<T, U>(x: T, y: U): T
(x: string, y: number): string;
};
f3 = (x, y) => { return x }
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