First commit

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+end_of_line = lf
+indent_style = space
+indent_size = 2

README.md

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+# Tailwind CSS Breakpoints Inspector
+A Tailwind CSS component that shows the currently active responsive breakpoint.
+
+<img src="screenshot.gif" width="534">
+
+## Install
+
+Requires **Tailwind v2.0** or higher but it should work for **Tailwind v1.0** too (not tested).
+
+1. Install the plugin:
+
+```bash
+npm install tailwindcss-breakpoints-inscpector --save-dev
+```
+
+2. Add it to your `tailwind.config.js` file:
+
+```js
+// tailwind.config.js
+module.exports = {
+  //...
+  plugins: [
+    require('tailwindcss-breakpoints-inscpector'),
+  ]
+}
+```
+
+## Usage
+
+Just run build tools and voila!
+No extra markup, no external ressources.
+
+The indicator is only present during development.
+
+Uner the hood we use svg for Tailwind logo and inspector render.
+
+## Customization
+
+You can customize this plugin in the `theme.breakpointsInspector` section of your `tailwind.config.js` file.
+
+
+#### Position
+
+The first item of the position configuration array can be `top` or `bottom`, the second item can be `left` or `right`.
+
+```js
+// tailwind.config.js
+module.exports = {
+  theme: {
+    breakpointsInspector: {
+      position: ['bottom', 'left'],
+    },
+  },
+  plugins: [
+    require('tailwindcss-breakpoints-inscpector'),
+  ],
+}
+```
+
+#### Styles
+
+Take a look at the [index.js](index.js) file to see all the default styles.
+
+```js
+// tailwind.config.js
+module.exports = {
+  theme: {
+    breakpointsInspector: {
+      style: {
+        backgroundColor: '#323232;',
+        color: '#9e9e9e',
+        // ...
+      },
+    },
+  },
+  plugins: [
+    require('tailwindcss-breakpoints-inscpector'),
+  ],
+}
+```
+
+#### Prefix
+
+Modify the debug label prefix with the `prefix` configuration option.
+
+```js
+// tailwind.config.js
+module.exports = {
+  theme: {
+    breakpointsInspector: {
+      prefix: 'My breakpoint is ',
+    },
+  },
+  plugins: [
+    require('tailwindcss-breakpoints-inscpector'),
+  ],
+}
+```
+
+#### Ignore screens
+
+To ignore a specific screen (for instance [dark mode](https://v1.tailwindcss.com/docs/breakpoints#dark-mode) in v1), add the screen name to the `ignore` configuration array.
+The Tailwind v1 `dark` screen is ignored by default.
+
+```js
+// tailwind.config.js
+module.exports = {
+  theme: {
+    breakpointsInspector: {
+      ignore: ['dark'],
+    },
+  },
+  plugins: [
+    require('tailwindcss-breakpoints-inscpector'),
+  ],
+}
+```

index.js

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+/*
+export default function({addBase, theme}) {
+  if (process.env.NODE_ENV === "production") return
+
+  const screens = theme('screens', {})
+  const breakpoints = Object.keys(screens)
+
+  addBase({
+    'body::after': {
+      content: `"Current breakpoint default (< ${screens[breakpoints[0]]})"`,
+      position: 'fixed',
+      right: '.5rem', // could replace with theme('spacing.2', '.5rem'), same for most of the other values
+      bottom: '.5rem',
+      padding: '.5rem .5rem .5rem 2rem',
+      background: 'no-repeat .5rem center / 1.25rem url(https://tailwindcss.com/favicon-32x32.png), #edf2f7',
+      border: '1px solid #cbd5e0',
+      color: '#d53f8c',
+      fontSize: '.875rem',
+      fontWeight: '600',
+      zIndex: '99999',
+    },
+    ...breakpoints.reduce((acc, current) => {
+      acc[`@media (min-width: ${screens[current]})`] = {
+        'body::after': {
+          content: `"Current breakpoint ${current}"`
+        }
+      }
+      return acc
+    }, {})
+  })
+}
+*/
+
+module.exports = function ({
+  addComponents,
+  theme
+}) {
+  if (process.env.NODE_ENV === "production") return
+
+  const defaultPosition = ['bottom', 'right'];
+  const screens = theme('screens');
+  const userStyles = theme('breakpointsInspector.style', {});
+  const ignoredScreens = theme('breakpointsInspector.ignore', ['dark']);
+  const minWidth = theme('breakpointsInspector.width', 120);
+  const prefix = theme('breakpointsInspector.prefix', 'Current breakpoint ');
+  const position = theme('breakpointsInspector.position', defaultPosition);
+  const positionY = position[0] || defaultPosition[0];
+  const positionX = position[1] || defaultPosition[1];
+  const symbols = /[\r\n%#()<>?[\\\]^`{|}]/g;
+  const minScreen = Object.entries(screens).filter(([screen]) => !ignoredScreens.includes(screen))[0][1];
+
+  const gridStyle = Object.assign({
+    color: '#d53f8c',
+    fontSize: '12px',
+    fontFamily: 'sans-serif',
+  }, userStyles, {
+    display: 'grid',
+    gridTemplateColumns: '1fr min-content',
+    gridTemplateRows: 'repeat(2, minmax(15px, 1fr))',
+    columnGap: '6px',
+    padding: '0',
+  });
+
+  const styleToString = (style) => {
+    return Object.keys(style).reduce((acc, key) => (
+      acc + key.split(/(?=[A-Z])/).join('-').toLowerCase() + ':' + style[key] + ';'
+    ), '');
+  };
+
+  const makeContent = (prefix, screen = null) => {
+
+    let template = `<svg width='` + (screen ? minWidth + 40 : minWidth) + `' height='30' xmlns='http://www.w3.org/2000/svg'>
+      <style>
+      .inspect--grid {` + styleToString(gridStyle) + `}
+      .inspect--text {
+        text-align: right;
+        overflow: hidden;
+        white-space: nowrap;
+      }
+      .inspect--indicator {
+        font-size: 200%;
+        text-align: center;
+        grid-row: span 2 / span 2;
+      }
+      </style>
+      <foreignObject width='100%' height='100%' x='0' y='0'>
+      <div xmlns='http://www.w3.org/1999/xhtml' class='inspect--grid'>
+      <div class='inspect--text'>${prefix}</div>
+      <div class='inspect--indicator'><b>${screen ? screen : ''}</b></div>
+      <div class='inspect--text'><b>${(screen ? '&gt;' + screens[screen] : '&lt;' + minScreen)}</b></div>
+      </div>
+      </foreignObject>
+      </svg>`;
+
+    template = template.replace(/>\s{1,}</g, `><`);
+    template = template.replace(/\s{2,}/g, ` `);
+
+    return `url("data:image/svg+xml,` + template.replace(symbols, encodeURIComponent) + `");`;
+  };
+
+  const components = {
+    'body::after': Object.assign({
+      position: 'fixed',
+      zIndex: '2147483647',
+      [positionY]: '.5rem',
+      [positionX]: '.5rem',
+      padding: '.25rem .5rem .25rem 1.75rem',
+      lineHeight: '1',
+      background: '#edf2f7',
+      backgroundImage: 'url("data:image/svg+xml,%3Csvg xmlns=\'http://www.w3.org/2000/svg\' fill=\'none\' viewBox=\'0 0 54 33\'%3E%3Cg clip-path=\'url(%23prefix__clip0)\'%3E%3Cpath fill=\'%2306B6D4\' fill-rule=\'evenodd\' d=\'M27 0c-7.2 0-11.7 3.6-13.5 10.8 2.7-3.6 5.85-4.95 9.45-4.05 2.054.513 3.522 2.004 5.147 3.653C30.744 13.09 33.808 16.2 40.5 16.2c7.2 0 11.7-3.6 13.5-10.8-2.7 3.6-5.85 4.95-9.45 4.05-2.054-.513-3.522-2.004-5.147-3.653C36.756 3.11 33.692 0 27 0zM13.5 16.2C6.3 16.2 1.8 19.8 0 27c2.7-3.6 5.85-4.95 9.45-4.05 2.054.514 3.522 2.004 5.147 3.653C17.244 29.29 20.308 32.4 27 32.4c7.2 0 11.7-3.6 13.5-10.8-2.7 3.6-5.85 4.95-9.45 4.05-2.054-.513-3.522-2.004-5.147-3.653C23.256 19.31 20.192 16.2 13.5 16.2z\' clip-rule=\'evenodd\'/%3E%3C/g%3E%3Cdefs%3E%3CclipPath id=\'prefix__clip0\'%3E%3Cpath fill=\'%23fff\' d=\'M0 0h54v32.4H0z\'/%3E%3C/clipPath%3E%3C/defs%3E%3C/svg%3E")',
+      backgroundRepeat: 'no-repeat',
+      backgroundSize: '22px auto',
+      backgroundPosition: '.5rem center',
+      border: '1px solid #cbd5e0',
+      content: makeContent(prefix),
+    }, userStyles),
+  };
+
+  Object.entries(screens)
+    .filter(([screen]) => !ignoredScreens.includes(screen))
+    .forEach(([screen]) => {
+      components[`@screen ${screen}`] = {
+        'body::after': {
+          content: makeContent(prefix, screen),
+        },
+      };
+    });
+
+  addComponents(components);
+}

package.json

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+{
+  "name": "tailwindcss-breakpoints-inscpector",
+  "version": "1.0.0",
+  "description": "A Tailwind CSS component that shows the currently active breakpoint.",
+  "main": "index.js",
+  "author": "Damien MATHIEU",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/hounddd/tailwindcss-breakpoint-inscpector.git"
+  },
+  "homepage": "https://github.com/hounddd/tailwindcss-breakpoint-inscpector",
+  "bugs": "https://github.com/hounddd/tailwindcss-breakpoint-inscpector/issues",
+  "peerDependencies": {
+    "tailwindcss": "^1.0 || ^2.0"
+  }
+}