Function Final

Marks a class as final, preventing inheritance from this class. When applied, any attempt to extend this class will result in a TypeError at runtime.

Remarks

This decorator does not prevent instantiation of the final class itself.

Example

@Final
class Foo<T> {
  foo: T;
  bar: string;

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

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

// No problem with instantiation
const foo = new Foo<string>('foo');

// The line below will cause a TypeError: Cannot inherit from the final class Foo
const sub = new SubFoo('subFoo');
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See

• Issue #1
• Issue #2
• Issue #3