"design:paramnames" metadata key

From https://github.com/Microsoft/TypeScript/pull/2589

A few notes on metadata:

• Type metadata uses the metadata key "design:type".
• Parameter type metadata uses the metadata key "design:paramtypes".
• Return type metadata uses the metadata key "design:returntype".

Can you please add support for a "design:paramnames" metadata key? It would return the design-time names of the arguments of a function

I can convert a function to string at runtime using Function.prototype.toString() and then use a couple of Regex to get the parameter names:

STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
ARGUMENT_NAMES = /([^\s,]+)/g;

But when a minifier/compressor is used the param names become "a", "b" ...

I would like to have a way to access the design-time names of the arguments of a function at run-time even after compression.

この issue ではファイルもテストも指定されていません。まず、コンパイラによるデコレータメタデータの出力箇所と、design:type、design:paramtypes、design:returntype の既存の処理を見つけます。次に、design:paramnames を追加する範囲を特定し、リクエストで説明されているミニファイに関する懸念を含め、出力される引数名のテストを定義します。