src/vs/editor/contrib/caretOperations/transpose.ts/TransposeLettersAction/constructor
class TransposeLettersAction:	constructor() {
		super({
			id: 'editor.action.transposeLetters',
			label: nls.localize('transposeLetters.label', "Transpose Letters"),
			alias: 'Transpose Letters',
			precondition: EditorContextKeys.writable,
			kbOpts: {
				kbExpr: EditorContextKeys.textInputFocus,
				primary: 0,
				mac: {
					primary: KeyMod.WinCtrl | KeyCode.KEY_T
				},
				weight: KeybindingWeight.EditorContrib
			}
		});
	}