jscodeshift
Facebook/Meta jscodeshift Best Practices
Comprehensive best practices guide for jscodeshift codemod development, designed for AI agents and LLMs. Contains 40 rules across 8 categories, prioritized by impact from critical (parser configuration, AST traversal) to incremental (advanced patterns). Each rule includes detailed explanations, real-world examples, and specific impact metrics.
When to Apply
Reference these guidelines when:
- Writing new jscodeshift codemods for code migrations
- Debugging transform failures or unexpected behavior
- Optimizing codemod performance on large codebases
- Reviewing codemod code for correctness
- Testing codemods for edge cases and regressions
Rule Categories by Priority
| Priority | Category | Impact | Prefix |
|---|---|---|---|
| 1 | Parser Configuration | CRITICAL | parser- |
| 2 | AST Traversal Patterns | CRITICAL | traverse- |
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