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Robin Malfait 01d1e98259
Canonicalization constant folding and handling zeros (#19095) 
The main goal of this PR was to support canonicalization of zero like
values. We essentially want to canonicalize `-mt-0` as `mt-0`, but also
`mt-[0px]`, `mt-[0rem]`, and other length-like units to just `mt-0`.

To do this, we had to handle 2 things:

1. We introduced some more constant folding, including making `0px` and
`0rem` fold to `0`. We only do this for length units. We also normalize
`-0`, `+0`, `-0.0` and so on to `0`.
2. While pre-computing utilities in our lookup table, we make sure that
we prefer `mt-0` over `-mt-0` if both result in the same signature.

Moved some of the constant folding logic into its own function and added
a bunch of separate tests for it.

## Test plan

Added more unit tests where we normalize different zero-like values to
`0`.

Running the canonicalization logic:
```js
designSystem.canonicalizeCandidates([
  '-m-0',
  '-m-[-0px]',
  '-m-[-0rem]',
  '-m-[0px]',
  '-m-[0rem]',
  'm-0',
  'm-[-0px]',
  'm-[-0rem]',
  'm-[0px]',
  'm-[0rem]',
  'm-[calc(var(--spacing)*0)]',
  'm-[--spacing(0)]',
  'm-[--spacing(0.0)]',
  'm-[+0]',
  'm-[-0]',
  '-m-[-0]',
  '-m-[+0]',
]) // → ['m-0']
```

---------

Co-authored-by: Jordan Pittman <jordan@cryptica.me>
2025-10-09 18:09:29 +00:00
.github run prettier 2025-10-06 17:15:57 +02:00
crates Prepare v4.1.14 release (#19037) 2025-10-01 11:48:02 -04:00
integrations Fix Safari devtools issues because of nested @supports at-rules without normal rule (#19069) 2025-10-06 20:04:40 +02:00
packages Canonicalization constant folding and handling zeros (#19095) 2025-10-09 18:09:29 +00:00
patches Upgrade lightningcss to 1.30.1 (#18037) 2025-05-15 13:16:02 +02:00
playgrounds Update eslint 9.35.0 → 9.36.0 (minor) (#19049) 2025-10-03 12:35:07 -04:00
scripts Add experimental @tailwindcss/oxide-wasm32-wasi (#17558) 2025-04-11 17:19:55 +02:00
.gitattributes Add agentic workflow issue-triage (#19057) 2025-10-06 12:24:51 +02:00
.gitignore Fix slow unit test (#17465) 2025-03-31 15:26:01 +02:00
.npmrc introduce v4 codebase 2024-03-05 14:29:15 +01:00
.prettierignore Hoist oxide/crates to just crates (#13333) 2024-03-23 09:00:48 -04:00
Cargo.lock Bump napi toolchain to 3.3 (#18947) 2025-09-19 17:08:41 +02:00
Cargo.toml Hoist oxide/crates to just crates (#13333) 2024-03-23 09:00:48 -04:00
CHANGELOG.md Canonicalization constant folding and handling zeros (#19095) 2025-10-09 18:09:29 +00:00
LICENSE Add README, LICENSE, and CONTRIBUTING (#13088) 2024-03-05 14:45:39 -05:00
package.json Update @playwright/test 1.55.0 → 1.55.1 (patch) (#19033) 2025-09-30 14:52:43 -04:00
pnpm-lock.yaml Update globby 14.1.0 → 15.0.0 (major) (#19056) 2025-10-06 11:14:31 +02:00
pnpm-workspace.yaml Bump Prettier (#18960) 2025-09-18 11:17:29 +02:00
README.md Update README.md (#18434) 2025-07-02 16:40:30 -04:00
rust-toolchain.toml Improve Oxide candidate extractor [0] (#16306) 2025-03-05 11:55:24 +01:00
turbo.json Fix segmentation fault when loading @tailwindcss/oxide in a Worker thread (#17276) 2025-03-18 16:28:20 -04:00
vitest.workspace.ts introduce v4 codebase 2024-03-05 14:29:15 +01:00

README.md

Tailwind CSS

A utility-first CSS framework for rapidly building custom user interfaces.

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Documentation

For full documentation, visit tailwindcss.com.

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Contributing

If you're interested in contributing to Tailwind CSS, please read our contributing docs before submitting a pull request.