New no-useless-override rule

[manu-st]

Feature Request

• TSLint version: 5.8
• TypeScript version: 2.5.3
• Running TSLint via: CLI / VSCode

TypeScript code being linted

   /* tslint:disable-next-line:prefer-function-over-method */
   foo ()
   {
      return this;
   }

with tslint.json configuration:

{
   "rules": {
       "prefer-function-over-method": true
   }
}

Wanted Behavior

It would be great to have a new rule "no-useless-override" which triggers a warning or error when you use an override to disable a rule. Very often you had an override for a special case but through various refactoring this override is not needed anymore and the less override the better has you do not want to add code in the future that won't trigger the linter warning/error because you forgot to remove the useless rule.

Having a rule that checks for non-used override would be great.

Actual behavior

No warnings

Expected behavior

ERROR in C:/Dev/components/data/Navigable.ts
(70,4): Override "prefer-function-over-method" is not needed. Remove the local override.

[ajafff]

Duplicate of #1330?

[manu-st]

That seems to be the case.