Install dependencies with npm install then run with node ./index.js.

index.js creates a zip file at ./tmp/test.zip that contains the two text files from the ./zip-contents directory.

Then it uses unzipper to iterate through this zip and compares the files in it to the originals in the ./zip-contents directory.

When using await fs.promises.readFile to read the original files during the for await (const entry of zip) loop, the zip stream stops emitting entries, so we only ever see the first entry in the zip.

Changing to fs.readFileSync to read the original file fixes the issue.