use ESM module syntax & update tui-lib

Exciting update! This doesn't make any substantial changes
exactly but does update the most quickly-archaic parts of
older Node code.

1 files changed, 1 insertions, 3 deletions

diff --git a/undo-manager.js b/undo-manager.js
index 4a042ad..9b53c2d 100644
--- a/undo-manager.js
+++ b/undo-manager.js
@@ -1,4 +1,4 @@
-class UndoManager {
+export default class UndoManager {
   constructor() {
     this.actionStack = []
     this.undoneStack = []
@@ -38,5 +38,3 @@ class UndoManager {
     return this.undoStack.length === 0
   }
 }
-
-module.exports = UndoManager