[playground] Show transpiled output for JavaScript inputs

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Comment

Apologies if this is the wrong repository, I could not find one for the playground.

When setting the input language to "JavaScript", the playground does not show the transpiled code on the right. Instead, it shows the input code as-is.

You can test it by setting the target to ES2015 and writing 1 ** 2 in the input file: if the language is set to TypeScript you'll see Math.pow(1, 2) on the right (playground), while if the language is set to JavaScript you'll see 1 ** 2 (playground).

Is there a way to see the transpiled code?

TypeScript playground の JavaScript 入力処理から始め、リンクされた ES2015 の例を使って TypeScript のパスと比較します。JavaScript を選択した状態で 1 ** 2 を入力すると、TypeScript の場合と一致するトランスパイル後の Math.pow(1, 2) 出力が表示されれば完了です。