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next-themes

Light/dark/green/yellow - multiple color themes

  • tutorial, repo
  • idea: from tw constants -> css vars -> tw utility classes
  • tw utility classes read css vars, css vars live on html tag with selector , change selector - change vars
  • th-background th-... is a single theme utility classes under which all themes are
// styles/global.css - from tw theme into css vars
--background: theme("colors.white");
---
// tailwind.config.js - from css vars into tw utility classes
'th-background': 'var(--background)',
  • color example with class selectors in _document.tsx, css vars and tw utility classes youtube tutorial

Only light/dark themes

// pages/_app.tsx
<ThemeProvider attribute="class">
---
// tailwind.config.js
darkMode: 'class',
  • next-themes only changes <html data-theme="emerald"> attribute/class value? you can change it in _document.tsx on body tag

Tailwind themes docs

  • theme

  • customizing-colors

  • problem: concatenated classes on html element, solution: both themes array and attribute props must be set <ThemeProvider themes={themes} attribute="class">

  • support opacity

function withOpacityValue(_variable) {
  return ({ opacityValue }) => {
    const variable = hexToRgb(_variable);

    if (opacityValue === undefined) {
      return `rgb(var(${variable}))`;
    }
    return `rgb(var(${variable}) / ${opacityValue})`;
  };
}

function hexToRgb(hex) {
  console.log('hex', hex);
  var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
  console.log('result', result);
  return result
    ? {
        r: parseInt(result[1], 16),
        g: parseInt(result[2], 16),
        b: parseInt(result[3], 16),
      }
    : null;
}

Themes plugin

  • .class is injected in base, problem is .emerald, .pink... are purged, they dont exist in template

  • theme must be plugin to convert hex to rgb at buildtime

  • problem: compilation error with @apply

Syntax error: "test-class-base" class does not exist. If "test-class-base" is a custom class, make sure it is defined within a @layer directive.
  • solution: scss files must not be imported in .tsx files but all scss files into a single index.scss and then it into _app.tsx
afaik you can only use @apply when the class is either from the tailwind config, or in the same file
  • rgba() syntax
/* old notation */
color: rgb(255, 255, 255);
color: rgba(255, 255, 255, 1);

/* new notation */
color: rgb(255 255 255);
color: rgb(255 255 255 / 1);
  • opacity and bg-opacity is not same, opacity - content too
  • for hovers: hover:bg-th-base-content hover:bg-opacity-5
  • for borders: border-th-base-200

Convert Hex to RGB

DaisyUI