JS Object.seal()


[JS Object.freeze()](https://texonom.com/js-objectfreeze-b9eb46e2561b475bac4e83465756dcfc) 
삭제만 불가능
```typedelete object1.property1; // cannot delete when sealed```



> [Object.seal()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal)




