esModuleInterop doesn't affect reexports

[wojpawlik]

TypeScript Version: 4.0.0-dev.20200707

Search Terms:

esmoduleinterop reexport

Code

https://gist.github.com/b48d1791d83ff67581238190eb583f67

Expected behavior:

lib/index.js exports require('./answer') (42)

Actual behavior:

lib/index.js exports require('./answer').default (undefined)

[rbuckton]

// @showEmit
// @showEmittedFile: b.js
// @module: commonjs
// @allowJs: true
// @esModuleInterop: true
// @strict: true
// @filename: a.js
module.exports = 42;
// @filename: b.ts
export {default} from './a'

Workbench Repro

[rbuckton]

This was fixed by #39490 and shipped in 4.0