Repro

{
  "rules": {
    "no-unused-vars": "off",
    "typescript/no-unused-vars": "error"
  }
}

type Foo = number

function test<Foo>(bar: Foo) {
    return bar
}

Expected Result
error that type Foo is not defined

Actual Result
all is good

Additional Info

There is few issues there:

• markVariableAsUsed is iterating over all variables even if found first one,
• type parameters are not validated

Versions