What version of TypeScript are you using?
2.6.2

What version of typescript-eslint-parser are you using?
11.0.0

What code were you trying to parse?

interface Foo {
    bar: string
}

const bar = 'blah'

What did you expect to happen?
The code to be considered valid from the perspective of no-use-before-define, or the README to call out that this is an unsupported case.

What happened?
The key bar in the interface on line 2 was flagged as being used before defined. If I removed the later const bar... assignment, the lint error went away.