What is the lightbulb icon in Atom?

Question

In Atom, on this particular line, a light bulb icon appears. Left-clicking and right-clicking seem to emit the same behavior they would if I clicked in the same part of any other line.

What is it? Why is it there and is there something I can do about it? It looks an awful lot like an icon I've seen in Visual Studio, which usually displayed some helpful tips to help me with my code.

Answer 1

It indicates that there is a TypeScript 'Quick Fix' available at that line. See the following documentation:

https://github.com/TypeStrong/atom-typescript/blob/master/docs/quickfix.md

Press ctrl+enter to show the quick fixes.

Answer 2

It indicates that a "Quick Fix" is available.

You can press Alt+Enter at the location of error to view the options, then select the desired quick fix and hit enter.