[no-use-before-define]: typedefs option doesn't work

[Hotell]

Repro

{
  "rules": {
    "typescript/no-use-before-define": ["error",{"typedefs": true}]
  }
}

// Should error according to docs, but it wont

let myVar: StringOrNumber = 'hello'
type StringOrNumber = string | number

Expected Result

Should work according to docs

Actual Result

Doesn't work at all

Additional Info

Also dunno if this is considered within the implementation, but there is a common pattern in React to get Props/State types from implementation by leveraging typeof. So if typedefs is set to false this should not raise any error:

type State = typeof initialState
const initialState = { count: 0, who: ''}

Versions

package	version
@typescript-eslint/eslint-plugin	1.3.0
@typescript-eslint/parser	X.Y.Z
TypeScript	3.3.3
ESLint	5.12
node	8.15
npm	X.Y.Z

[bradzacher]

@armano2 has been working on a solution to this (and other scope issues), see #233.

[armano2]

@bradzacher my PR is giving us possibility to support types but it will not fix this issue, we have to add support for it to this rule.

types will be stored in separated property (they can't collide with variables)

[aMarCruz]

The same error with the same config and this:

type Props = { foo: typeof Foo };  // <= 'Foo' was using before it was defined

const Foo = () => {};

[bradzacher]

Merging into #1856