Shadcn/ui upgrade to Tailwindcss v.4

[Mac-DevOSYandex]

When will shadcn ui upgrade to tailwind css v.4? daisyUI has already done so...

[adaptive-shield-matrix]

Jack recorded/noticed some problems migrating shadcn-ui to Tailwind v4
https://www.youtube.com/watch?v=YzQrHnlWyZ0

[jvzaniolo]

Those are not problems with migrating shadcn-ui to Tailwind v4, he states that the current Shadcn version does not yet support Tailwind v4.

[redjohnsh]

It might be time to revisit this since tailwind just dropped a public beta.

[dstroot]

shadcn/ui works with Tailwindcss v4. Here is an example TW4 globals.css file:

@import "tailwindcss";

@variant dark (&:is(.dark *));

@plugin "tailwindcss-animate";

@theme {
  --color-background: hsl(var(--background));
  --color-foreground: hsl(var(--foreground));

  --color-card: hsl(var(--card));
  --color-card-foreground: hsl(var(--card-foreground));

  --color-popover: hsl(var(--popover));
  --color-popover-foreground: hsl(var(--popover-foreground));

  --color-primary: hsl(var(--primary));
  --color-primary-foreground: hsl(var(--primary-foreground));

  --color-secondary: hsl(var(--secondary));
  --color-secondary-foreground: hsl(var(--secondary-foreground));

  --color-muted: hsl(var(--muted));
  --color-muted-foreground: hsl(var(--muted-foreground));

  --color-accent: hsl(var(--accent));
  --color-accent-foreground: hsl(var(--accent-foreground));

  --color-destructive: hsl(var(--destructive));
  --color-destructive-foreground: hsl(var(--destructive-foreground));

  --color-border: hsl(var(--border));
  --color-input: hsl(var(--input));
  --color-ring: hsl(var(--ring));

  --color-chart-1: hsl(var(--chart-1));
  --color-chart-2: hsl(var(--chart-2));
  --color-chart-3: hsl(var(--chart-3));
  --color-chart-4: hsl(var(--chart-4));
  --color-chart-5: hsl(var(--chart-5));

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

@layer base {
  :root {
    --background: 0 0% 100%;
    --foreground: 0 0% 3.9%;
    --card: 0 0% 100%;
    --card-foreground: 0 0% 3.9%;
    --popover: 0 0% 100%;
    --popover-foreground: 0 0% 3.9%;
    --primary: 0 0% 9%;
    --primary-foreground: 0 0% 98%;
    --secondary: 0 0% 96.1%;
    --secondary-foreground: 0 0% 9%;
    --muted: 0 0% 96.1%;
    --muted-foreground: 0 0% 45.1%;
    --accent: 0 0% 96.1%;
    --accent-foreground: 0 0% 9%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 0 0% 98%;
    --border: 0 0% 89.8%;
    --input: 0 0% 89.8%;
    --ring: 0 0% 3.9%;
    --chart-1: 12 76% 61%;
    --chart-2: 173 58% 39%;
    --chart-3: 197 37% 24%;
    --chart-4: 43 74% 66%;
    --chart-5: 27 87% 67%;
    --radius: 0.5rem;
  }

  .dark {
    --background: 0 0% 3.9%;
    --foreground: 0 0% 98%;
    --card: 0 0% 3.9%;
    --card-foreground: 0 0% 98%;
    --popover: 0 0% 3.9%;
    --popover-foreground: 0 0% 98%;
    --primary: 0 0% 98%;
    --primary-foreground: 0 0% 9%;
    --secondary: 0 0% 14.9%;
    --secondary-foreground: 0 0% 98%;
    --muted: 0 0% 14.9%;
    --muted-foreground: 0 0% 63.9%;
    --accent: 0 0% 14.9%;
    --accent-foreground: 0 0% 98%;
    --destructive: 0 62.8% 30.6%;
    --destructive-foreground: 0 0% 98%;
    --border: 0 0% 14.9%;
    --border-shadow: 255, 255, 255, 0.145;
    --input: 0 0% 14.9%;
    --ring: 0 0% 83.1%;
    --chart-1: 220 70% 50%;
    --chart-2: 160 60% 45%;
    --chart-3: 30 80% 55%;
    --chart-4: 280 65% 60%;
    --chart-5: 340 75% 55%;
  }
}

I am not sure if this is the best way but I would love a very simple Nextjs, Tailwind and shadcn/ui setup on Next v15 and Tailwind v4. I have that working but it seems like there should be a "better way" - I wish shadcn would just fully adopt tailwind variables and not have special "shadcn" variables. Also not sure if this is the best dark mode approach - but it's how shadcn currently works. Cheers!

[dstroot]

Here's one that's a little cleaner and shows various ways to define the colors:

@import "tailwindcss";

@variant dark (&:where(.dark, .dark *));

@plugin "tailwindcss-animate";

@theme {
  --color-background: var(--background);
  --color-foreground: var(--foreground);
  --color-card: var(--card);
  --color-card-foreground: var(--card-foreground);
  --color-popover: var(--popover);
  --color-popover-foreground: var(--popover-foreground);
  --color-primary: var(--primary);
  --color-primary-foreground: var(--primary-foreground);
  --color-secondary: var(--secondary);
  --color-secondary-foreground: var(--secondary-foreground);
  --color-muted: var(--muted);
  --color-muted-foreground: var(--muted-foreground);
  --color-accent: var(--accent);
  --color-accent-foreground: var(--accent-foreground);
  --color-destructive: var(--destructive);
  --color-destructive-foreground: var(--destructive-foreground);
  --color-border: var(--border);
  --color-input: var(--input);
  --color-ring: var(--ring);
  --color-chart-1: var(--chart-1);
  --color-chart-2: var(--chart-2);
  --color-chart-3: var(--chart-3);
  --color-chart-4: var(--chart-4);
  --color-chart-5: var(--chart-5);
  --radius-lg: var(--radius);
  --radius-md: calc(var(--radius) - 2px);
  --radius-sm: calc(var(--radius) - 4px);
}

@layer base {
  :root {
    --background: var(--color-neutral-50);
    --foreground: var(--color-neutral-900);
    --card: hsl(0 0% 100%);
    --card-foreground: hsl(0 0% 3.9%);
    --popover: hsl(0 0% 100%);
    --popover-foreground: hsl(0 0% 3.9%);
    --primary: hsl(0 0% 9%);
    --primary-foreground: hsl(0 0% 98%);
    --secondary: hsl(0 0% 96.1%);
    --secondary-foreground: hsl(0 0% 9%);
    --muted: hsl(0 0% 96.1%);
    --muted-foreground: hsl(0 0% 45.1%);
    --accent: hsl(0 0% 96.1%);
    --accent-foreground: hsl(0 0% 9%);
    --destructive: hsl(0 84.2% 60.2%);
    --destructive-foreground: hsl(0 0% 98%);
    --border: hsl(0 0% 89.8%);
    --input: hsl(0 0% 89.8%);
    --ring: hsl(0 0% 3.9%);
    --chart-1: hsl(12 76% 61%);
    --chart-2: hsl(173 58% 39%);
    --chart-3: hsl(197 37% 24%);
    --chart-4: hsl(43 74% 66%);
    --chart-5: hsl(27 87% 67%);
    --radius: 0.5rem;
  }

  .dark {
    --background: var(--color-neutral-950);
    --foreground: var(--color-neutral-100);
    --card: hsl(0, 0%, 3.9%);
    --card-foreground: hsl(0 0% 98%);
    --popover: hsl(0 0% 3.9%);
    --popover-foreground: hsl(0 0% 98%);
    --primary: hsl(0 0% 98%);
    --primary-foreground: hsl(0 0% 9%);
    --secondary: hsl(0 0% 14.9%);
    --secondary-foreground: hsl(0 0% 98%);
    --muted: hsl(0 0% 14.9%);
    --muted-foreground: hsl(0 0% 63.9%);
    --accent: hsl(0 0% 14.9%);
    --accent-foreground: hsl(0 0% 98%);
    --destructive: hsl(0 62.8% 30.6%);
    --destructive-foreground: hsl(0 0% 98%);
    --border: hsl(0 0% 14.9%);
    --input: hsl(0 0% 14.9%);
    --ring: hsl(0 0% 83.1%);
    --chart-1: hsl(220 70% 50%);
    --chart-2: hsl(160 60% 45%);
    --chart-3: hsl(30 80% 55%);
    --chart-4: hsl(280 65% 60%);
    --chart-5: hsl(340 75% 55%);
  }
}