I had a discussion with the author of sheetjs about a year back as a response to my comment[1] on VBA and Excel. We went back and forth on building a kickstarter campaign - especially for his "transpiler" that converts VBA to JS.

I'm glad to see this has come so far ahead. My offer to contribute to a kickstarter still stands !

[1] https://news.ycombinator.com/item?id=4361091