Since TypeScript 2.1.4, TypeScript provides the code fixes feature available with the getCodeFixes tsserver command. Each TypeScript version provides new available code fixes.

Here a list of available code fixes according the TypeScript version.

TypeScript 2.2.x is not released for the moment, you can install with npm install typescript@next and configure TypeScript Runtime

To enable those code fixes, you need to configure your tsconfig.json like this:

{
	"compilerOptions": {
		"noUnusedLocals": true,
		"noUnusedParameters": true
	}
}

See this Unused identifiers compiler code PR to see samples.