jdb8 / sucrase-jest-export-repro

example minimal repro for sucrase#715

sucrase-jest-export-repro

Attempting to reproduce an inconsistency between Babel and Sucrase when dealing with transitive mocked exports.

This may or may not be an actual bug, but I wanted to find a minimal repro for the weird behaviour I was seeing.

To repro:

• yarn to set up all deps
• yarn test to run jest twice, once with babel and once with sucrase
• note that the babel-transformed case succeeds, while the sucrase case does not

The test is attempting to spy on a function (getValue) from a fake library some-lib. The test spies on it via the default export of some-lib/some-lib.js, while the code under test uses the named export from some-lib/index.js instead.

Under babel, this somehow works - likely due to some weird export shenanigans taking place?

Under sucrase, the spied function is never called, so the test fails.