langchain-js Deprecations & Breaking Changes
Verified AST deprecations and code replacement rules for langchain-js.
⚡ Free Example Preview (1 of 14): api.api_change → unified
Deprecated in langchain@1.5.9In langchain-js langchain@1.5.9, `symbol` signature updated.
❌ Outdated Syntax
None
✅ Modern Replacement Syntax
# langchain-js >= langchain@1.5.9 unified()
🔒
13 Additional Breaking Change Patches Gated
We have detected and verified 14 total breaking changes for langchain-js. Get instant FastMCP integration for Cursor, Claude Code, and Windsurf to automatically patch all 14 deprecations in your editor.
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