Function Frozen

When applied to a class it creates a frozen instance of it, thus preventing modifications to instance properties after instantiation.

Example

@Frozen
class Foo<T> {
 foo: T;
 bar?: MaybeUndefined<string>;

 constructor(foo: T) {
   this.foo = foo;
   this.bar = 'bar';
 }

 someFoo(): T {
   return this.foo;
 }
}

const foo = new Foo('foo');
// The line below will cause a TypeError: Cannot assign to read only property 'bar'
foo.bar = 'altered bar';
// The line below will cause a TypeError: Cannot delete property 'bar'
delete foo.bar;
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