Add refactoring action to annotate a variable or a function signature component with its inferred type

Hi, I'm using latest stable VSCode / latest nightly TS and I'm not sure if codefixes and refactorings have been implemented there yet, in any case, having a refactoring option to take any variable which receives an implicit inferred type, say, through a function call:

function test(): number[] {
  // ...
}

let x = test(); 

And being able to right-click x and invoke an action like Annotate with inferred type (or Extract inferred type), such that the resulting statement would look like:

let x: number[] = test();

could be very useful!

VSCodeで使用されているTypeScriptのcodefixおよびリファクタリングの動作から始め、最新のnightly版TypeScriptで例を再現します。推論された変数型と関数シグネチャの構成要素をアクションでどのように扱うべきかを定義し、let x: number[] = test(); のようなアノテーションが生成されることを確認します。