src/vs/editor/contrib/linesOperations/browser/linesOperations.ts/DeleteAllLeftAction/constructor
class DeleteAllLeftAction:	constructor() {
		super({
			id: 'deleteAllLeft',
			label: nls.localize('lines.deleteAllLeft', "Delete All Left"),
			alias: 'Delete All Left',
			precondition: EditorContextKeys.writable,
			kbOpts: {
				kbExpr: EditorContextKeys.textInputFocus,
				primary: 0,
				mac: { primary: KeyMod.CtrlCmd | KeyCode.Backspace },
				weight: KeybindingWeight.EditorContrib
			}
		});
	}