Sometimes I am very tempted to just add this to a project, but of course you never know what it would do to third-party dependencies:

Object
  .getOwnPropertyNames(Object.prototype)
  .forEach((p) => delete Object.prototype[p]);

Even though I know I will probably never run into this scenario, it drives me crazy that we all use JavaScript plain objects as lookup dictionaries and make assumptions about property lookups:

type BlogPostsDictionary = Record<string, BlogPost>;
let postsBySlug: BlogPostsDictionary;
let slug: string;
let post: BlogPost = postsBySlug[slug];

Knowing in the back of my mind that if slug were "constructor", "hasOwnProperty", etc., then post would be, of all things, a function!

(Yes, of course there's always Object.create(null), but you'd never get to use shorthand {} — you would even need to wrap any instances of the { ... } spread operator syntax!)