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411: The Power of Tree-Sitter

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https://codenamejessica.com/blogs/entry/1126-411-the-power-of-tree-sitter/

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by: Chris Coyier
Wed, 01 Oct 2025 13:24:46 +0000

Alex and Chris hop on the show to talk about a bit of technology that Alex calls “The 2nd best technological choice he’s ever made.” That technology is called Tree-sitter. It’s a code parsing tool for building ASTs (Abstract Syntax Trees) out of code. GitHub uses it to power search and “go to” functionality. The creators now work on Zen, where a code parser is paramount. We use it to understand an entire Pen very quickly so we can understand how it all links together (among other things) and make a plan for how to process the Pen (a “build plan”). It’s fast, accurate, forgiving, and extensible. Just a heck of a learning curve.

Jump Links

  • 00:07 CodePen 2.0 is more than just a fresh coat of paint
  • 03:00 Treesitter explained
  • 12:04 Making the right choices with technology
  • 21:50 How we parse your code
  • 26:10 We don’t want you to have to be in config hell
  • 28:48 Type type type stop see what happens

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    https://codenamejessica.com/blogs/entry/1126-411-the-power-of-tree-sitter/

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