This PR is a follow up of #18815 and #18816, but this time let's migrate
the `supports` theme keys.
Let's imagine you have the following Tailwind CSS v3 configuration:
```ts
export default {
content: ['./src/**/*.html'],
theme: {
extend: {
supports: {
// Automatically handled by bare values (using CSS variable as the value)
foo: 'foo: var(--foo)', // parentheses are optional
bar: '(bar: var(--bar))',
// Not automatically handled because names differ
baz: 'qux: var(--foo)',
// ^^^ ^^^ ← different names
// Custom
grid: 'display: grid',
},
},
},
}
```
Then we would generate the following Tailwind CSS v4 CSS:
```css
@custom-variant supports-baz {
@supports (qux: var(--foo)) {
@slot;
}
}
@custom-variant supports-grid {
@supports (display: grid) {
@slot;
}
}
```
Notice how we didn't generate a custom variant for `data-foo` or
`data-bar` because those are automatically handled by bare values.
I also went with the longer form of `@custom-variant`, we could use the
single selector approach, but that felt less clear to me.
```css
@custom-variant supports-baz (@supports (qux: var(--foo)));
@custom-variant supports-grid (@supports (display: grid));
```
---------
Co-authored-by: Jordan Pittman <thecrypticace@gmail.com>
This PR is similar to and a follow up of #18815, but this time to
migrate the `data` theme keys.
Let's imagine you have the following Tailwind CSS v3 configuration:
```ts
export default {
content: ['./src/**/*.html'],
theme: {
extend: {
data: {
// Automatically handled by bare values
foo: 'foo',
// ^^^ ^^^ ← same names
// Not automatically handled by bare values
bar: 'baz',
// ^^^ ^^^ ← different names
// Completely custom
checked: 'ui~="checked"',
},
},
},
}
```
Then we would generate the following Tailwind CSS v4 CSS:
```css
@custom-variant data-bar (&[data-baz]);
@custom-variant data-checked (&[data-ui~="checked"]);
```
Notice how we didn't generate a custom variant for `data-foo` because
those are automatically handled by bare values.
This PR migrates `aria` theme keys when migrating from Tailwind CSS v3
to v4.
While working on improving some of the error messages to get more
insights into why migrating the JS file changed
(https://github.com/tailwindlabs/tailwindcss/pull/18808), I ran into an
issue where I couldn't think of a good comment to why `aria` theme keys
were not being migrated. (Internally we have `aria` "blocked").
So instead of figuring out a good error message..., I just went ahead
and added the migration for `aria` theme keys.
Let's imagine you have the following Tailwind CSS v3 configuration:
```ts
export default {
content: ['./src/**/*.html'],
theme: {
extend: {
aria: {
// Built-in (not really, but visible because of intellisense)
busy: 'busy="true"',
// Automatically handled by bare values
foo: 'foo="true"',
// ^^^ ^^^ ← same names
// Not automatically handled by bare values because names differ
bar: 'baz="true"',
// ^^^ ^^^ ← different names
// Completely custom
asc: 'sort="ascending"',
desc: 'sort="descending"',
},
},
},
}
```
Then we would generate the following Tailwind CSS v4 CSS:
```css
@custom-variant aria-bar (&[aria-baz="true"]);
@custom-variant aria-asc (&[aria-sort="ascending"]);
@custom-variant aria-desc (&[aria-sort="descending"]);
```
Notice how we didn't generate a custom variant for `aria-busy` or
`aria-foo` because those are automatically handled by bare values.
We could also emit a comment near the CSS to warn about the fact that
`@custom-variant` will always be sorted _after_ any other built-in
variants.
This could result in slightly different behavior, or different order of
classes when using `prettier-plugin-tailwindcss`.
I don't know how important this is, because before this PR we would just
use `@config './tailwind.config.js';`.
Edit: when using the `@config` we override `aria` and extend it, which
means that it would be in the expected order 🤔
---------
Co-authored-by: Jordan Pittman <thecrypticace@gmail.com>
Given this variant:
```js
matchVariant(
"foo",
(value) => `&:is([data-foo='${value}'])`,
{
values: {
DEFAULT: "",
bar: "bar",
baz: "bar",
},
}
)
```
We weren't listing `foo-bar` and `foo-baz` in IntelliSense. This PR
fixes that.
This PR fixes two issues:
- When a variant is defined by `matchVariant` it could match unknown
values but not apply the variant (because it's unknown). This would
result in a utility being output that is the _same_ as a bare utility
without variants but a longer name. These were intended to be discarded
but weren't done so correctly.
- Similarly, when we encounter a known value but its not a string the
same thing would happen where we'd output a utility without applying the
variant. This was also intended to be discarded.
Basically given this code:
```js
matchVariant(
"foo",
(value) => `&:is([data-foo='${value}'])`,
{
values: {
DEFAULT: "",
bar: "bar",
obj: { some: "object" },
},
}
)
```
And this HTML:
```html
<div class="foo-bar:bg-none foo-[baz]:bg-none foo-baz:bg-none foo-obj:bg-none"></div>
```
This CSS would be produced:
```css
@layer utilities {
.foo-bar\:bg-none {
&:is([data-foo='bar']) {
background-image: none;
}
}
/* this one shouldn't be here */
.foo-baz\:bg-none {
background-image: none;
}
/* this one shouldn't be here */
.foo-obj\:bg-none {
background-image: none;
}
.foo-\[baz\]\:bg-none {
&:is([data-foo='baz']) {
background-image: none;
}
}
}
```
We introduced an accidental breaking change a few months ago in 4.1.5
with #17812.
We added `visibility` to the property list in `transition` which
unfortunately only applies its change instantly when going from
invisible -> visible.
I've checked `display`, `content-visibility`, and `pointer-events` and
they apply their change instantly (as best I can tell) when
transitioning by default. And `overlay` only "applies" for discrete
transitions so it can stay as well.
The spec has this to say about [animating
`visibility`](https://www.w3.org/TR/web-animations-1/#animating-visibility):
> For the visibility property, visible is interpolated as a discrete
step where values of p between 0 and 1 map to visible and other values
of p map to the closer endpoint; if neither value is visible then
discrete animation is used.
This means that for visible (t=0) -> hidden (t=1) the timeline looks
like this:
- t=0.0: visible
- t=0.5: visible
- t=0.999…8: visible
- t=1.0: invisible
This means that for invisible (t=0) -> visible (t=1) the timeline looks
like this:
- t=0.0: invisible
- t=0.000…1: visible
- t=0.5: visible
- t=1.0: visible
So the value *is* instantly applied if the element is initially
invisible but when going the other direction this is not the case. This
happens whether or not the transition type is discrete.
While the spec calls out [`display` as working
similarly](https://drafts.csswg.org/css-display-4/#display-animation) in
practice this is only the case when `transition-behavior` is explicitly
set to `allow-discrete` otherwise the change is instant for both
directions.
Fixes#18793
## Summary
In Tailwind 3 the border colors were able to be used with `divide`
utilities. I made it so that's true for Tailwind 4.
## Test plan
Just used `pnpm run tdd` and making it fails then making sure it passes.
---------
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>
Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
request.
### What changed?
#### ✳️ enhanced-resolve (5.18.2 → 5.18.3) ·
[Repo](https://github.com/webpack/enhanced-resolve)
<details>
<summary>Release Notes</summary>
<h4><a
href="https://github.com/webpack/enhanced-resolve/releases/tag/v5.18.3">5.18.3</a></h4>
<blockquote><h3 dir="auto">Fixes</h3>
<ul dir="auto">
<li>Fixed nonsensible intersection in types</li>
</ul>
<h3 dir="auto">Performance</h3>
<ul dir="auto">
<li>Decreased initial loading time</li>
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5.18.3</code></a></li>
<li><a
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decrease initial loading time (#458)</code></a></li>
<li><a
href="5f74295eac"><code>refactor:
update eslint config (#457)</code></a></li>
<li><a
href="86ff2125e9"><code>fix(types):
fix nonsensible intersection</code></a></li>
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Fixes#18695
Was waiting for 1.2.20 b/c of some build failures. Hopefully fixed now.
Also appears to fix the above linked bug about Windows symlinks.
[ci-all]
This PR fixes 2 false-positives when running the upgrade tool on a
Tailwind CSS v3 project converting it to a Tailwind CSS v4 project.
The issue occurs around migrations with short simple names that have a
meaning outside if Tailwind CSS, e.g. `blur` and `outline`.
This PR fixes 2 such cases:
1. The `addEventListener` case:
```js
document.addEventListener('blur', handleBlur)
```
We do this by special casing the `addEventListener(` case and making
sure the first argument to `addEventListener` is never migrated.
2. A JavaScript variable with default value:
```js
function foo({ foo = "bar", outline = true, baz = "qux" }) {
// ...
}
```
The bug is relatively subtle here, but it has actually nothing to do
with `outline` itself, but rather the fact that some quote character
came before and after it on the same line...
One of our heuristics for determining if a migration on these small
words is safe, is to ensure that the candidate is inside of a string.
Since we didn't do any kind of quote balancing, we would consider the
`outline` to be inside of a string, even though it is not.
So to actually solve this, we do some form of quote balancing to ensure
that it's _not_ inside of a string in this case.
Additionally, this PR also introduces a small refactor to the
`is-safe-migration.test.ts` file where we now use a `test.each` to
ensure that failing tests in the middle don't prevent the rest of the
tests from running.
### Test plan
1. Added dedicated tests for the cases mentioned in the issue (#18675).
2. Added a few more tests with various forms of whitespace.
Fixes: #18675
Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
request.
### What changed?
#### ✳️ h3 (1.15.3 → 1.15.4) · [Repo](https://github.com/h3js/h3) ·
[Changelog](https://github.com/h3js/h3/blob/main/CHANGELOG.md)
<details>
<summary>Release Notes</summary>
<h4><a
href="https://github.com/h3js/h3/releases/tag/v1.15.4">1.15.4</a></h4>
<blockquote><p dir="auto"><a
href="https://bounce.depfu.com/github.com/h3js/h3/compare/v1.15.2...v1.15.4">compare
changes</a></p>
<h3 dir="auto">🩹 Fixes</h3>
<ul dir="auto">
<li>
<strong>getRequestHost:</strong> Return first host from <code
class="notranslate">x-forwarded-host</code> (<a
href="https://bounce.depfu.com/github.com/h3js/h3/pull/1175">#1175</a>)</li>
</ul>
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<strong>useSession:</strong> Backport <code
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href="https://bounce.depfu.com/github.com/h3js/h3/pull/1058">#1058</a>)</li>
</ul>
<h3 dir="auto">🏡 Chore</h3>
<ul dir="auto">
<li>
<strong>docs:</strong> Fix typos (<a
href="https://bounce.depfu.com/github.com/h3js/h3/pull/1108">#1108</a>)</li>
</ul>
<h3 dir="auto">❤️ Contributors</h3>
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href="https://bounce.depfu.com/github.com/pi0">@pi0</a>)</li>
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<li>Izoukhai (<a
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</ul></blockquote>
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</details>
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Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
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### What changed?
#### ✳️ jiti (2.4.2 → 2.5.1) · [Repo](https://github.com/unjs/jiti) ·
[Changelog](https://github.com/unjs/jiti/blob/main/CHANGELOG.md)
<details>
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<h4><a
href="https://github.com/unjs/jiti/releases/tag/v2.5.1">2.5.1</a></h4>
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</ul>
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<li><a
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Since we (optionally) support source maps now it's possible that a later
PostCSS plugin that *still* does url rewriting might fail to do so
correctly because nodes will have preserved source locations in dev
builds where before we "pretended" that everything came from the
original file.
But, because we can't know if such a plugin is present, disabling this
behavior when source maps are enabled could cause issues *and* would be
a breaking change.
I wish everything *could just work* here but realistically we can't know
what plugins have run before our PostCSS plugin or what plugins will run
after so the best option (I think) we can offer here is to allow users
to disable url rewriting at the plugin level.
Fixes#16700
Fixes https://github.com/tailwindlabs/tailwindcss-typography/issues/384
Basically when addUtilities/addComponents/matchUtilities/matchComponents
saw a value of `false` it was being output instead of being discarded
like it was in v3.
The types really require these to be strings but for things like the
typography plugin this isn't really carried through from its theme
config so it was easy to put anything in there and not realize it
doesn't match the expected types.
Basically this:
```js
addUtilities({
'.foo': {
a: 'red',
'z-index': 0,
'.bar': false,
'.baz': null, // this one already worked
'.qux': undefined,
},
})
```
Now works like it did in v3 and omits `.bar`, `.baz`, and `.qux`
Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
request.
### What changed?
#### ✳️ bun (1.2.17 → 1.2.18) · [Repo](https://github.com/oven-sh/bun)
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This PR tweaks the dropdown arrow added to an input by Chrome when it
has a `list` attribute pointing to a `<datalist>`.
Right now the arrow isn't centered vertically:
<img width="227" height="58" alt="Screenshot 2025-07-14 at 15 41 50"
src="https://github.com/user-attachments/assets/b354a5e8-432d-432d-bfe4-f7b6f6683548"
/>
The cause of this is the line height being inherited into the pseudo
element which controls how the marker is positioned. I *think* this is
because it's being drawn with unicode symbols but I'm not sure. It could
just be from the `list-item` display.
After this PR changes the line height its centered again:
<img width="227" height="58" alt="Screenshot 2025-07-14 at 15 42 05"
src="https://github.com/user-attachments/assets/1afa1f33-cc28-4b1f-9e04-e546f6848f57"
/>
Some notes:
This only affects Chrome and also does not appear to cause issues for
date/time inputs. While weird that this pseudo is the one used for a
`<datalist>` marker it is indeed correct.
Fixes#18499
Can use this Play to test the change:
https://play.tailwindcss.com/jzT35CRpr0
---------
Co-authored-by: Jonathan Reinink <jonathan@reinink.ca>
Fixes https://github.com/tailwindlabs/tailwindcss-forms/issues/182
Inside JS plugins and configs we weren't tracking source location info
so using things like `addBase(…)` could result in warnings inside Vite's
url rewriting PostCSS plugin because not all declarations had a source
location.
The goal here is for calls to `addBase` to generate CSS that points back
to the `@plugin` or `@config` that resulted in it being called.
Here is everything you need to know about this update. Please take a
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### What changed?
#### ✳️ enhanced-resolve (5.18.1 → 5.18.2) ·
[Repo](https://github.com/webpack/enhanced-resolve)
<details>
<summary>Release Notes</summary>
<h4><a
href="https://github.com/webpack/enhanced-resolve/releases/tag/v5.18.2">5.18.2</a></h4>
<blockquote><h3 dir="auto">Fixes</h3>
<ul dir="auto">
<li>[Types] FileSystem type</li>
</ul></blockquote>
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<ul>
<li><a
href="0bf45033f4"><code>chore(release):
5.18.2</code></a></li>
<li><a
href="b2441769bd"><code>fix:
types</code></a></li>
<li><a
href="775f2fb8ed"><code>chore:
migrate to eslint-config-webpack (#453)</code></a></li>
<li><a
href="6df312e9a6"><code>chore:
fix tsconfig (#452)</code></a></li>
<li><a
href="b059bff8ce"><code>ci:
show report</code></a></li>
<li><a
href="c974464f46"><code>chore:
fix</code></a></li>
<li><a
href="29f9405129"><code>chore:
fix small stuff</code></a></li>
<li><a
href="01a04fd898"><code>chore:
refactor dev env</code></a></li>
<li><a
href="66a745681a"><code>ci:
show report</code></a></li>
<li><a
href="3bf44c7a6e"><code>ci:
node v24</code></a></li>
<li><a
href="bbbf6ab5b0"><code>ci:
node v24</code></a></li>
<li><a
href="38e9fd9acb"><code>feat:
export `SyncFileSystem` and `BaseFileSystem` types</code></a></li>
<li><a
href="3c9d4b6d51"><code>chore:
fix generation</code></a></li>
<li><a
href="4918c5b3a4"><code>feat:
export type SyncFileSystem and type BaseFileSystem</code></a></li>
</ul>
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### What changed?
#### ✳️ @types/bun (1.2.15 → 1.2.17) ·
[Repo](https://github.com/DefinitelyTyped/DefinitelyTyped)
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Fixes#18400
In v3 when you used `important: true` it did not affect `@apply`.
However, in v4 it does and there's no way to make it *not*. This is
definitely a bug and would be unexpected for users coming from v3 who
use `@apply` and `important` together.
Basically, the following code, along with the detected utility `flex` in
source files…
```css
@import 'tailwindcss/utilities' important;
.flex-explicitly-important {
@apply flex!;
}
.flex-not-important {
@apply flex;
}
```
… would output this:
```css
.flex {
display: flex !important;
}
.flex-explicitly-important {
display: flex !important;
}
.flex-not-important {
display: flex !important;
}
```
But it's expected that `@apply` doesn't consider the "global" important
state. This PR addresss this problem and now the output is this:
```css
.flex {
display: flex !important;
}
.flex-explicitly-important {
display: flex !important;
}
.flex-not-important {
display: flex; /* this line changed */
}
```
If you want to mark a utility as important in `@apply` you can still use
`!` after the utility to do so as shown above.
---------
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>
Closes#18381
* [Changelog for Vite 7.0.0
(2025-06-24)](https://github.com/vitejs/vite/blob/main/packages/vite/CHANGELOG.md#700-2025-06-24)
Starting from Vite 7, Node 18 support will be dropped, which doesn't
really affect Tailwind. It might be worth mentioning in the
documentation that the recommended minimum Node versions are 20.19 and
22.12.
Vite 7 is only available in ESM format, which is also not an issue.
Vite's browser support aligns with the v4 guidelines:
```
Chrome 87 → 107 (tw: 111)
Edge 88 → 107 (tw: 111)
Firefox 78 → 104 (tw: 128)
Safari 14.0 → 16.0 (tw: 16.4)
```
* [Vite 7 - Browser
Support](https://vite.dev/guide/migration.html#default-browser-target-change)
* [Tailwind CSS v4 - Browser
Support](https://tailwindcss.com/docs/compatibility#browser-support)
So, at first glance, there's nothing more to do except enabling support
for these versions.
---------
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
request.
### What changed?
#### ✳️ postcss-import (16.1.0 → 16.1.1) ·
[Repo](https://github.com/postcss/postcss-import) ·
[Changelog](https://github.com/postcss/postcss-import/blob/master/CHANGELOG.md)
<details>
<summary>Release Notes</summary>
<h4>16.1.1 (from changelog)</h4>
<blockquote><ul dir="auto">
<li>Fix incorrect cascade layer order when some resources can not be
inlined (<a
href="https://bounce.depfu.com/github.com/postcss/postcss-import/issues/567">#567</a>,
<a
href="https://bounce.depfu.com/github.com/postcss/postcss-import/pull/574">#574</a>)</li>
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<li><a
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<li><a
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on modern Node versions (#577)</code></a></li>
<li><a
href="10325fc024"><code>Upgrade
eslint & config; use flat config (#576)</code></a></li>
<li><a
href="9227642040"><code>Migrate
config renovate.json (#575)</code></a></li>
<li><a
href="2544155491"><code>Update
dependency prettier to ~3.5.0 (#572)</code></a></li>
<li><a
href="83108aa207"><code>Fix
incorrect cascade layer order when some resources can not be inlined
(#574)</code></a></li>
<li><a
href="cad00220bf"><code>Update
dependency sugarss to v5 (#568)</code></a></li>
<li><a
href="32deb082c6"><code>Update
dependency c8 to v10 (#565)</code></a></li>
<li><a
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dependency prettier to ~3.4.0 (#569)</code></a></li>
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This pull request contains a couple of minor documentation fixes.
- Corrected a typo from `predicable` to `predictable` in a comment for
`DarkModeStrategy`.
- Applied minor formatting to a comment in a test file.
These changes help improve code clarity and maintainability.
Description:
This pull request corrects minor typos in comments and improves clarity
in two files:
- Fixes a typo in a comment within migrate-js-config.ts ("migrateable" →
"migratable").
- Refines a comment in wasm.test.ts for better readability.
No functional code changes are included.
This PR fixes a regression we shipped in v4.1.9, when using arbitrary
values and injecting spaces around operator.
When you use `w-[calc(100%-var(--foo))]`, you expect that this generates
valid CSS:
```css
width: calc(100% - var(--foo));
```
But due to a regression, we generated:
```css
width: calc(100%-var(--foo));
```
Which is invalid CSS.
This is because the algorithm we used to know when we had to inject a
space around the `-` didn't take the `%` sign into account.
We also didn't handle uppercase units like `123PX` properly. This PR
fixes both issues.
## Test plan
1. Added a regression test for the `%`
2. Added a regression test for uppercase units like `123PX`
Fixes: #18288
Fixes#18219
## Summary
In an arbitrary value, if there's a non-numeric character both before
and after a hyphen, there's no need for a space.
## Test plan
`decodeArbitraryValue` will correctly format special CSS values like
`fit-content`. I believe spaces are only necessary if there's a digit
either before or after the hyphen.
```js
decodeArbitraryValue('min(fit-content,calc(100dvh-4rem))')
```
This way, the result of the following arbitrary value will also be
correct:
```html
<div class="min-h-[min(fit-content,calc(100dvh-4rem))]"></div>
```
```css
.min-h-\[min\(fit-content\,calc\(100dvh-4rem\)\)\] {
min-height: min(fit-content, calc(100dvh - 4rem));
}
```
---------
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
Co-authored-by: Robin Malfait <malfait.robin@gmail.com>
Strings are not parsed correctly for custom properties which makes the
following CSS raise an `Unterminated string: ";"` error:
```css
:root {
--custom: 'data:text/plain;base64,SGVsbG8sIFdvcmxkIQ==';
}
```
According to the spec, we should accept semi-colon as long as they are
not at the top level.
> The allowed syntax for [custom
properties](https://drafts.csswg.org/css-variables/#custom-property) is
extremely permissive. The <declaration-value> production matches any
sequence of one or more tokens, so long as the sequence does not contain
bad-string-token, bad-url-token, unmatched )-token, ]-token, or }-token,
or top-level semicolon-token tokens or delim-token tokens with a value
of "!".
Extract from: https://drafts.csswg.org/css-variables/#syntax
I was only able to reproduce with **tailwindcss v4**, the previous
version seems to support this. This issue is mitigated by the fact that
even if you want to use a data URL in a custom property, you would need
to wrap the value in a `url()` anyway:
```css
:root {
--my-icon-url: url('data:image/svg+xml;base64,...==');
}
.icon {
background-image: var(--my-icon-url);
}
```
Which works perfectly fine with the current/latest version (v4.1.8).
The fix suggested is to share the same code between regular property and
custom property when it comes to detect that the value is a string
starting with a `SINGLE_QUOTE` or `DOUBLE_QUOTE`. I have moved the
existing code in a `findEndStringIdx` which returns the position of the
ending single/double quote.
---------
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
Here is everything you need to know about this update. Please take a
good look at what changed and the test results before merging this pull
request.
### What changed?
#### ✳️ bun (1.2.13 → 1.2.15) · [Repo](https://github.com/oven-sh/bun)
Sorry, we couldn't find anything useful about this release.
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### What changed?
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## Description
Fixed a typo in the container.ts comment where "a the" was incorrectly
written as "the" for better readability.
## Test Plan
- [x] Verified the change is purely documentation-related and doesn't
affect functionality
- [x] Ensured the comment is more readable and grammatically correct
- [x] No tests needed as this is a documentation-only change
## Changes
- Modified comment in `packages/tailwindcss/src/compat/container.ts`
- Changed "When setting a the `screens` in v3" to "When setting the
`screens` in v3"
Co-authored-by: 中野 博文 <hirofumi0082@gmail.com>
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
## Summary
- Fixes a typo: "a arbitrary" → "an arbitrary" in a comment/description.
## Details
- This is a documentation-only change. No code logic is affected.
## Test Plan
- N/A (doc-only)
Co-authored-by: 中野 博文 <hirofumi0082@gmail.com>
This PR fixes an issue where the `blur` in `wire:model.blur="…"` was
incorrectly migrated. We solved it by marking `wire:…` as an unsafe
region (`…` can be anything but whitespace).
Fixes: #18187
## Test plan
Added a test with this use case
---------
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
This PR adds some improvements to the upgrade tool where it can now also
migrate negative arbitrary values to negative bare values.
We already had support for the positive version of this:
```diff
- mb-[32rem]
+ mb-128
```
But now it can also handle negative values:
```diff
- mb-[-32rem]
+ -mb-128
```
The only tricky part here is that we had to hoist the `-` sign. Before
this PR, we were actually generating `mb--128` and that is invalid so it
was thrown out.
## Test plan
1. Added a test to ensure that the negative values are correctly
transformed.
This PR fixes 2 issues with the migration tool where certain classes
weren't migrated. This PR fixes those 2 scenarios:
### Scenario 1
When you have an arbitrary opacity modifier that doesn't use `%`, but is
just a number typically between `0` and `1` then this was not converted
to the bare value equivalent before.
E.g.:
```html
<div class="bg-[#f00]/[0.16]"></dv>
```
Will now be converted to:
```html
<div class="bg-[#f00]/16"></dv>
```
### Scenario 2
Fixes a bug when a CSS function was used in a fallback value in the CSS
variable shorthand syntax. In that case we didn't migrate the class to
the new syntax.
This was because we assumed that a `(` was found, that we are dealing
with a CSS function.
E.g.:
```html
<div class="w-[--spacing(1)]"></div>
^ This indicates a CSS function, we should not be
converting this to `w-(--spacing(1))`
```
But if a function was used as a fallback value, for example:
```html
<div class="bg-[--my-color,theme(colors.red.500)]"></dv>
```
Then we also didn't migrate it, but since the function call is in the
fallback, we can still migrate it.
Will now properly be converted to:
```html
<div class="bg-(--my-color,var(--color-red-500))"></dv>
```
## Test plan
1. Added a test for the first case
2. Added a test for the second case
3. Also added an integration-like test that runs all the migration steps
to make sure that the `theme(…)` in the fallback also gets updated to
`var(…)`. This one caught an issue because the `var(…)` wasn't handling
prefixes correctly.
