Update TypeScript to 5.6.2

package.json

@@ -294,7 +294,7 @@
     "rollup-plugin-copy": "^3.3.0",
     "rollup-plugin-lit-css": "^4.0.0",
     "semver": "^7.3.5",
-    "typescript": "~5.4.5",
+    "typescript": "~5.6.2",
     "wireit": "^0.14.0"
   },
   "dependencies": {

src/playground-code-editor.ts

@@ -43,9 +43,9 @@ interface TypedMap<T> extends Map<keyof T, unknown> {
   get<K extends keyof T>(key: K): T[K];
   set<K extends keyof T>(key: K, value: T[K]): this;
   delete<K extends keyof T>(key: K): boolean;
-  keys(): IterableIterator<keyof T>;
-  values(): IterableIterator<T[keyof T]>;
-  entries(): IterableIterator<{[K in keyof T]: [K, T[K]]}[keyof T]>;
+  keys(): MapIterator<keyof T>;
+  values(): MapIterator<T[keyof T]>;
+  entries(): MapIterator<{[K in keyof T]: [K, T[K]]}[keyof T]>;
 }
 
 export interface CodeEditorHint {

src/test/typescript-worker_test.ts

@@ -89,7 +89,7 @@ suite('typescript builder', () => {
           name: 'index.js',
           // TODO(aomarks) This should probably return a 400 error instead of an
           // empty but valid file.
-          content: 'export {};\n',
+          content: '',
           contentType: 'text/javascript',
         },
       },
@@ -132,7 +132,7 @@ suite('typescript builder', () => {
         kind: 'file',
         file: {
           name: 'index.js',
-          content: 'let foo = 3;\n' + 'foo = "foo";\nexport {};\n',
+          content: 'let foo = 3;\n' + 'foo = "foo";\n',
           contentType: 'text/javascript',
         },
       },