Lodash Migration & Compat Guide

Guide users through migrating lodash to es-toolkit and understanding the strict vs compat APIs, grounded in actual source code.

Input

$ARGUMENTS — Lodash code to migrate, specific function names, or a question about strict vs compat.

Core Concepts

es-toolkit (strict): Opinionated, simplified API for the 85% use case. Smaller bundle, may differ from lodash in edge cases by design. New functions are added here.

es-toolkit/compat: Aims for full lodash test compatibility within a defined scope. See docs/compatibility.md for out-of-scope behaviors (e.g., implicit type conversions, prototype modifications).

Why source-first matters

The only reliable way to know the difference between strict and compat is to inspect the version installed in the user's project. The skill may be installed as a standalone directory, so never assume the es-toolkit repository or a sibling docs directory is available.

Workflow