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refactor(dev): migrate lodash to es-toolkit and add type-safety to ConfigPreset #14111

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cksal0805
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@cksal0805 cksal0805 commented Aug 3, 2025

Summary

TL;DR

This PR proposes replacing lodash with es-toolkit across the codebase.

  • Replaced lodash imports in ~48 files with es-toolkit/compat equivalents
  • No functional changes — existing behavior is preserved
  • Removed outdated ESLint rules that caused build warnings

Why this change might help:

  • Smaller bundle size (up to 97% smaller)
  • Improved performance and tree-shaking
  • Modern TypeScript support and compatibility with modern tooling

All tests pass, and core functionality works as expected.
This is a suggestion for consideration — open to feedback or rollback if needed.

https://es-toolkit.dev/compatibility.html

Thanks

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changeset-bot bot commented Aug 3, 2025

⚠️ No Changeset found

Latest commit: 1929d95

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remix-cla-bot bot commented Aug 3, 2025

Hi @cksal0805,

Welcome, and thank you for contributing to React Router!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

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remix-cla-bot bot commented Aug 3, 2025

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

@brophdawg11
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I must be missing something, but this looks like it increases the size of the package?

Here's my build steps:

pnpm clean
pnpm i
pnpm build
cd packages/react-router-dev
pnpm pack
ls -l react-router-dev-7.7.1.tgz

I did those on the SHA prior to this branch and the HEAD of this branch:

# Ran on SHA e89ad301 (the one before this PR started)
-rw-r--r--  1 matt  staff  119321 Aug 14 12:13 react-router-dev-7.7.1.tgz

# Ran on SHA 1929d95b (this branch)
-rw-r--r--  1 matt  staff  137999 Aug 14 12:11 react-router-dev-7.7.1.tgz

@brophdawg11
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Aren't we only using the utils we import from lodash, not the whole thing? So the full es-toolkit might be larger than those 4 individual utilities from lodash?

import pick from "lodash/pick";
import omit from "lodash/omit";
import cloneDeep from "lodash/cloneDeep";
import isEqual from "lodash/isEqual";

@MichaelDeBoey MichaelDeBoey changed the title refactor: ConfigPreset type safety and migrate lodash to es-toolkit refactor(dev): migrate lodash to es-toolkit and add type-safety to ConfigPreset Aug 14, 2025
@MichaelDeBoey MichaelDeBoey added dependencies Pull requests that update a dependency file pkg:@react-router/dev labels Aug 14, 2025
@brophdawg11
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Closing because as noted in #14180 (comment) es-toolkit has a node_modules footprint twice the size of lodash so this PR makes things worse, not better.

@jacob-ebey
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If you're going to AI slop something, at-least spend some time making sure the description is correct. Not sure where the other 42 file changes are.

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4 participants