XLSX.js is a JavaScript library for converting the data in base64 XLSX files into JavaScript objects - and back! Please note that this library is licensed under the Microsoft Office Extensible File License - a license NOT approved by the OSI. While this license is based off of the MS-PL, which is OSI-approved, there are significant differences.
Not checking for t-elements but for si-elements.
Joining the content of the contained t-elements as the shared string.
See #9 for a not working example.