import/export: false positives for typescript type + value export

[bradzacher]

Reporting from typescript-eslint/typescript-eslint#10
The following code is valid typescript (even though it's a bit weird).

// unexected error: Multiple exports of name 'Foo'. (import/export)
export const Foo = 1;
// unexected error: Multiple exports of name 'Foo'. (import/export)
export type Foo = string;

When importing this, it causes the name to work as both a type and a value.

import { Foo } from './foo';

const x: Foo = 'string val';
const y = Foo; // === 1

[ljharb]

This seems like the same issue as #923.

[bradzacher]

@ljharb - looking at #923 - that is about a different rule (named).
Also it also looks like it's about flow, where the code in the OP is not valid.