Disallow floating promises. (#14605)

packages/vscode-ide-companion/eslint.config.mjs

@@ -20,6 +20,10 @@ export default [
       parser: tsParser,
       ecmaVersion: 2022,
       sourceType: 'module',
+      parserOptions: {
+        project: './tsconfig.json',
+        tsconfigRootDir: import.meta.dirname,
+      },
     },
 
     rules: {
@@ -35,6 +39,7 @@ export default [
       eqeqeq: 'warn',
       'no-throw-literal': 'warn',
       semi: 'warn',
+      '@typescript-eslint/no-floating-promises': ['error'],
     },
   },
 ];