chore: update lib to es2020

Author: xiejay97

tsconfig.base.json

@@ -10,7 +10,7 @@
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "target": "es2015",
-    "lib": ["es2015", "dom"],
+    "lib": ["es2020", "dom"],
     "useDefineForClassFields": true,
     "noFallthroughCasesInSwitch": true,
     "noPropertyAccessFromIndexSignature": true,