add version and license (#3255)

* add current version & license

* generate fixtures

* update changelog

Co-authored-by: Adam Wathan <adam.wathan@gmail.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Add version comment to Preflight ([#3255](https://github.com/tailwindlabs/tailwindcss/pull/3255))
 - Ensure sourcemap input is deterministic when using `@apply` in Vue components ([#3356](https://github.com/tailwindlabs/tailwindcss/pull/3356))
 - Ensure placeholder opacity is consistent across browsers ([#3308](https://github.com/tailwindlabs/tailwindcss/pull/3308))
 - Add `cursor-help` by default ([#3199](https://github.com/tailwindlabs/tailwindcss/pull/3199))

__tests__/fixtures/tailwind-output-flagged.css

@@ -1,3 +1,5 @@
+/*! tailwindcss v2.0.2 | MIT License | https://tailwindcss.com */
+
 /*! modern-normalize v1.0.0 | MIT License | https://github.com/sindresorhus/modern-normalize */
 
 /*

__tests__/fixtures/tailwind-output-important.css

@@ -1,3 +1,5 @@
+/*! tailwindcss v2.0.2 | MIT License | https://tailwindcss.com */
+
 /*! modern-normalize v1.0.0 | MIT License | https://github.com/sindresorhus/modern-normalize */
 
 /*

__tests__/fixtures/tailwind-output-no-color-opacity.css

@@ -1,3 +1,5 @@
+/*! tailwindcss v2.0.2 | MIT License | https://tailwindcss.com */
+
 /*! modern-normalize v1.0.0 | MIT License | https://github.com/sindresorhus/modern-normalize */
 
 /*

__tests__/fixtures/tailwind-output.css

@@ -1,3 +1,5 @@
+/*! tailwindcss v2.0.2 | MIT License | https://tailwindcss.com */
+
 /*! modern-normalize v1.0.0 | MIT License | https://github.com/sindresorhus/modern-normalize */
 
 /*

src/plugins/preflight.js

@@ -1,5 +1,6 @@
 import fs from 'fs'
 import postcss from 'postcss'
+import packageJson from '../../package.json'
 
 export default function () {
   return function ({ addBase }) {
@@ -7,6 +8,13 @@ export default function () {
       fs.readFileSync(require.resolve('modern-normalize'), 'utf8')
     )
     const preflightStyles = postcss.parse(fs.readFileSync(`${__dirname}/css/preflight.css`, 'utf8'))
-    addBase([...normalizeStyles.nodes, ...preflightStyles.nodes])
+
+    addBase([
+      postcss.comment({
+        text: `! tailwindcss v${packageJson.version} | MIT License | https://tailwindcss.com`,
+      }),
+      ...normalizeStyles.nodes,
+      ...preflightStyles.nodes,
+    ])
   }
 }