Tailwind v4 Support

[oneezy]

Prerequisites

• This feature already exists in shadcn/ui - if not, it won't be considered here so don't continue with your issue.

Describe the feature

Tailwind v4 just hit beta release an no breaking changes are expected. Would be cool to see a guide for shadcn-svelte on how to make the switch for some v3 users

(honestly not sure if it exists yet in shadcn but it will)

[ieedan]

shadcn-ui/ui#5949

[ieedan]

Saying no breaking changes is a bit misleading here I believe they mean no breaking style changes but the config changes are pretty massive.

[huntabyte]

This feature already exists in shadcn/ui - if not, it won't be considered here so don't continue with your issue.

[oneezy]

Saying no breaking changes is a bit misleading here I believe they mean no breaking style changes but the config changes are pretty massive.

to clarify @ieedan , i meant no more breaking changes to be expected in tw v4 development (according to Adam).

tw v3 to v4 is a breaking change but it simplifies using tw tremendously.

Tailwind UI website has been fully migrated to v4

[nrjdalal]

for now, if you guys want to use tailwind v4 compatible with any new or existing app, it is pretty simple

just run the codemod -

npx @tailwindcss/upgrade@next

so now the thing is you won't be able to add new components, as there won't be tailwind.config.js/ts anymore, so how do you add new components to your app?

just create a temporary new project and run -

npx shadcn@latest init -d
npx shadcn@latest add -a
npx @tailwindcss/upgrade@next

and voila, you have a new tailwind v4 version of the components and css, just copy and paste required content

---

if you wish to get this task automated, via CLI tool, feel free to emojify this comment and I will make one

[epavanello]

If anyone is interested, i converted the default shadcdn-svelte configuration.
This should be the css-first configuration

@import 'tailwindcss';
@plugin 'tailwindcss-animate';

:root {
	--background: hsl(0 0% 100%);
	--foreground: hsl(222.2 84% 4.9%);
	--muted: hsl(210 40% 96.1%);
	--muted-foreground: hsl(215.4 16.3% 46.9%);
	--popover: hsl(0 0% 100%);
	--popover-foreground: hsl(222.2 84% 4.9%);
	--card: hsl(0 0% 100%);
	--card-foreground: hsl(222.2 84% 4.9%);
	--border: hsl(214.3 31.8% 91.4%);
	--input: hsl(214.3 31.8% 91.4%);
	--primary: hsl(222.2 47.4% 11.2%);
	--primary-foreground: hsl(210 40% 98%);
	--secondary: hsl(210 40% 96.1%);
	--secondary-foreground: hsl(222.2 47.4% 11.2%);
	--accent: hsl(210 40% 96.1%);
	--accent-foreground: hsl(222.2 47.4% 11.2%);
	--destructive: hsl(0 72.2% 50.6%);
	--destructive-foreground: hsl(210 40% 98%);
	--ring: hsl(222.2 84% 4.9%);
	--radius: 0.5rem;
	--sidebar-background: hsl(0 0% 98%);
	--sidebar-foreground: hsl(240 5.3% 26.1%);
	--sidebar-primary: hsl(240 5.9% 10%);
	--sidebar-primary-foreground: hsl(0 0% 98%);
	--sidebar-accent: hsl(240 4.8% 95.9%);
	--sidebar-accent-foreground: hsl(240 5.9% 10%);
	--sidebar-border: hsl(220 13% 91%);
	--sidebar-ring: hsl(217.2 91.2% 59.8%);
}

.dark {
	--background: hsl(222.2 84% 4.9%);
	--foreground: hsl(210 40% 98%);
	--muted: hsl(217.2 32.6% 17.5%);
	--muted-foreground: hsl(215 20.2% 65.1%);
	--popover: hsl(222.2 84% 4.9%);
	--popover-foreground: hsl(210 40% 98%);
	--card: hsl(222.2 84% 4.9%);
	--card-foreground: hsl(210 40% 98%);
	--border: hsl(217.2 32.6% 17.5%);
	--input: hsl(217.2 32.6% 17.5%);
	--primary: hsl(210 40% 98%);
	--primary-foreground: hsl(222.2 47.4% 11.2%);
	--secondary: hsl(217.2 32.6% 17.5%);
	--secondary-foreground: hsl(210 40% 98%);
	--accent: hsl(217.2 32.6% 17.5%);
	--accent-foreground: hsl(210 40% 98%);
	--destructive: hsl(0 62.8% 30.6%);
	--destructive-foreground: hsl(210 40% 98%);
	--ring: hsl(212.7 26.8% 83.9%);
	--sidebar-background: hsl(240 5.9% 10%);
	--sidebar-foreground: hsl(240 4.8% 95.9%);
	--sidebar-primary: hsl(224.3 76.3% 48%);
	--sidebar-primary-foreground: hsl(0 0% 100%);
	--sidebar-accent: hsl(240 3.7% 15.9%);
	--sidebar-accent-foreground: hsl(240 4.8% 95.9%);
	--sidebar-border: hsl(240 3.7% 15.9%);
	--sidebar-ring: hsl(217.2 91.2% 59.8%);
}

@theme {
	--color-border: var(--border);
	--color-input: var(--input);
	--color-ring: var(--ring);
	--color-background: var(--background);
	--color-foreground: var(--foreground);
	--color-primary: var(--primary);
	--color-primary-foreground: var(--primary-foreground);
	--color-secondary: var(--secondary);
	--color-secondary-foreground: var(--secondary-foreground);
	--color-destructive: var(--destructive);
	--color-destructive-foreground: var(--destructive-foreground);
	--color-muted: var(--muted);
	--color-muted-foreground: var(--muted-foreground);
	--color-accent: var(--accent);
	--color-accent-foreground: var(--accent-foreground);
	--color-popover: var(--popover);
	--color-popover-foreground: var(--popover-foreground);
	--color-card: var(--card);
	--color-card-foreground: var(--card-foreground) / <alpha-value>;
	--color-sidebar-DEFAULT: var(--sidebar-background);
	--color-sidebar-foreground: var(--sidebar-foreground);
	--color-sidebar-primary: var(--sidebar-primary);
	--color-sidebar-'primary-foreground': var(--sidebar-primary-foreground);
	--color-sidebar-accent: var(--sidebar-accent);
	--color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
	--color-sidebar-border: var(--sidebar-border);
	--color-sidebar-ring: var(--sidebar-ring);

	--radius-xl: calc(var(--radius) + 4px);
	--radius-lg: var(--radius);
	--radius-md: calc(var(--radius) - 2px);
	--radius-sm: calc(var(--radius) - 4px);

	--animate-accordion-down: accordion-down 0.2s ease-out;
	--animate-accordion-up: accordion-up 0.2s ease-out;
	--animate-caret-blink: caret-blink 1.25s ease-out infinite;

	@keyframes accordion-down {
		from: {
			height: 0;
		}
		to: {
			height: var(--bits-accordion-content-height);
		}
	}
	@keyframes accordion-up {
		from {
			height: var(--bits-accordion-content-height);
		}
		to {
			height: 0;
		}
	}
	@keyframes caret-blink {
		0%,
		70%,
		100% {
			opacity: 1;
		}
		20%,
		50% {
			opacity: 0;
		}
	}
}

@utility container {
	margin-inline: auto;
	padding-inline: 2rem;
}

@layer base {
	* {
		@apply border-border;
	}
	body {
		@apply bg-background text-foreground;
	}
}

By pasting this content into your app's css, you should be able to delete the tailwind.config.ts file without any differences

[nrjdalal]

missing @variant for theme toggling in config above

I just whipped out a new CLI tool to experiment with @nextjs, @shadcn and @tailwindcss v4-beta

you can try it too, at npmjs.com/package/shadcnext

[ieedan]

missing @variant for theme toggling in config above

I just whipped out a new CLI tool to experiment with @nextjs, @shadcn and @tailwindcss v4-beta

you can try it too, at npmjs.com/package/shadcnext

This is a tool for next not svelte

[nrjdalal]

ohh right, use steps than, should work