message: fix: tsconfig enable strictNullChecks
diff: },
  "allowSyntheticDefaultImports": true,
  "skipLibCheck": true,
  - "declaration": false
  + "declaration": false,
  + "strictNullChecks": true
  },
  "exclude": ["node_modules", "lib", "es", "dist", "**/__tests__", "**/__test__", "**/demo"]
  }
  