message: Set "target": "es2021" for viewer
diff: {
  "compilerOptions": {
  "lib": [
  - "es2019", "dom", "dom.iterable"
  + "es2021", "dom", "dom.iterable"
  ],
  "module": "es2015",
  "noFallthroughCasesInSwitch": true,
  "outDir": "../out/viewer",
  "sourceMap": true,
  "strict": true,
  - "target": "es2019",
  + "target": "es2021",
  "typeRoots": []
  }
  }
  