Add @typescript-eslint/prefer-nullish-coalescing eslint rule

src/common/input/Keyboard.test.ts

@@ -26,7 +26,7 @@ function testEvaluateKeyboardEvent(partialEvent: {
     ctrlKey: partialEvent.ctrlKey || false,
     shiftKey: partialEvent.shiftKey || false,
     metaKey: partialEvent.metaKey || false,
-    keyCode: partialEvent.keyCode !== undefined ? partialEvent.keyCode : 0,
+    keyCode: partialEvent.keyCode ?? 0,
     code: partialEvent.code || '',
     key: partialEvent.key || '',
     type: partialEvent.type || ''

src/common/input/KittyKeyboard.test.ts

@@ -9,7 +9,7 @@ function createEvent(partialEvent: Partial<IKeyboardEvent> = {}): IKeyboardEvent
     ctrlKey: partialEvent.ctrlKey || false,
     shiftKey: partialEvent.shiftKey || false,
     metaKey: partialEvent.metaKey || false,
-    keyCode: partialEvent.keyCode !== undefined ? partialEvent.keyCode : 0,
+    keyCode: partialEvent.keyCode ?? 0,
     code: partialEvent.code || '',
     key: partialEvent.key || '',
     type: partialEvent.type || 'keydown'

src/common/input/UnicodeV6.test.ts

@@ -169,7 +169,7 @@ it('wcwidth should match all values from the old implementation', function(): vo
       if (num < 127) {
         return 1;
       }
-      const t = table || initTable();
+      const t = table ?? initTable();
       if (num < 65536) {
         return t[num >> 4] >> ((num & 15) << 1) & 3;
       }