Repl never outputs anything

[casieber]

Repro Steps:
Type anything that should not get fully tersed away into the write or paste code here box. For instance with the default options you can use: console.log( 'Hello World' );

Expected:
Output from running terser.minify is shown in the output box.

Actual:
Nothing is shown.

I'll open a PR shortly to address this, but creating issue to track it.