Simon Willison’s Weblog

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11th December 2025

Research AST-Grep Import Rewriter — Leveraging ast-grep and custom YAML rules, the AST-Grep Import Rewriter offers a structured approach to automatically extract, analyze, and rewrite obfuscated JavaScript import statements across ES6, CommonJS, dynamic imports, and webpack bundles. By parsing source files, it generates mapping templates and applies user-defined mappings, converting unreadable module paths into meaningful names with either regex- or AST-based transformations.
Posted 11th December 2025 at 3:50 pm

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