no-redeclare throws errors on overloaded functions

[j-f1]

What version of TypeScript are you using?

2.5.3

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

8.0.0

What code were you trying to parse?

export async function readFile(
  filename: string,
  options?: { flag?: string }
): Promise<Buffer>
export async function readFile(
  filename: string,
  options?: { encoding: BufferEncoding; flag?: string }
): Promise<string>
export async function readFile(
  filename: string,
  options?: { encoding?: string; flag?: string }
): Promise<Buffer | string> {
  // ...
}

What did you expect to happen?

No errors — readFile is only declared once.

What happened?

'readFile' is already defined.

[JamesHenry]

We should hopefully be able to solve this with upcoming custom Referencer work

[JamesHenry]

This was finally fixed by #412. I added the source above as an integration test.