Added 'override' keywords to functions and properties extending from …

[hsreina]

What version of TypeScript are you targeting?

Since version 4.3 of TypeScript, override keyword has been introduced for properties or functions of classes extending from other classes.

Recent frameworks using Typescript might enforce the presence of the override keyword.

Of course implicit in projects can be disabled with the follow code. But I think it might be better to have it.

{
  "compilerOptions": {
    // ...
    "noImplicitOverride": true
  }
}