Typescript noUncheckedIndexedAccess

no-unchecked-indexed-access.ts

interface Options {
  path: string;
  permissions: number;

  // Extra properties are caught by this index signature.
  [propName: string]: string | number;
}

function checkOptions(opts: Options) {
  opts.path; // string
  opts.permissions; // number

  // These are all allowed too!
  // They have the type 'string | number'.
  opts.yadda.toString();
  opts["foo bar baz"].toString();
  opts[Math.random()].toString();
}