JS Typedef merged with default export alias behaves strangely

TypeScript Version: 3.4.0-dev.201xxxxx

Search Terms:

Code

in a TS file:

import Def from "./file.js"

type Q = Def;

console.log(Def);

with file.js:

const x = 12;
export {x as default};
/**
 * @typedef {string | number} default
 */

with checkJs and allowJs both on, the hover text for Def is surprisingly correct:

however the console.log is marked as an error, stating:

'Def' only refers to a type, but is being used as a value here.

Expected behavior:
Since the quickinfo shows it's clearly a value (and a value is, in fact, exported), the default import should be usable as a value.

Actual behavior:
The default import is not usable as a value without error.

cc @sandersn

Reproduce the issue with the TypeScript 3.4.0-dev setup using the provided .ts and .js snippets, with checkJs and allowJs enabled. Trace how the default export alias and JSDoc typedef named default are merged, then verify that the imported Def is accepted in console.log while retaining the shown type information.