prefix animation names

__tests__/plugins/animation.test.js

@@ -0,0 +1,92 @@
+import postcss from 'postcss'
+import processPlugins from '../../src/util/processPlugins'
+import plugin from '../../src/plugins/animation'
+
+function css(nodes) {
+  return postcss.root({ nodes }).toString()
+}
+
+test('defining animation and keyframes', () => {
+  const config = {
+    theme: {
+      animation: {
+        none: 'none',
+        spin: 'spin 1s linear infinite',
+        ping: 'ping 1s cubic-bezier(0, 0, 0.2, 1) infinite',
+      },
+      keyframes: {
+        spin: { to: { transform: 'rotate(360deg)' } },
+        ping: { '75%, 100%': { transform: 'scale(2)', opacity: '0' } },
+      },
+    },
+    variants: {
+      animation: [],
+    },
+  }
+
+  const { utilities } = processPlugins([plugin()], config)
+
+  expect(css(utilities)).toMatchCss(`
+    @layer utilities {
+      @variants {
+        @keyframes spin {
+          to { transform: rotate(360deg); }
+        }
+        @keyframes ping {
+          75%, 100% { transform: scale(2); opacity: 0; }
+        }
+      }
+    }
+    
+    @layer utilities {
+      @variants {
+        .animate-none { animation: none; }
+        .animate-spin { animation: spin 1s linear infinite; }
+        .animate-ping { animation: ping 1s cubic-bezier(0, 0, 0.2, 1) infinite; }
+      }
+    }  
+  `)
+})
+
+test('defining animation and keyframes with prefix', () => {
+  const config = {
+    prefix: 'tw-',
+    theme: {
+      animation: {
+        none: 'none',
+        spin: 'spin 1s linear infinite',
+        ping: 'ping 1s cubic-bezier(0, 0, 0.2, 1) infinite',
+      },
+      keyframes: {
+        spin: { to: { transform: 'rotate(360deg)' } },
+        ping: { '75%, 100%': { transform: 'scale(2)', opacity: '0' } },
+      },
+    },
+    variants: {
+      animation: [],
+    },
+  }
+
+  const { utilities } = processPlugins([plugin()], config)
+
+  expect(css(utilities)).toMatchCss(`
+    @layer utilities {
+      @variants {
+        @keyframes tw-spin {
+          to { transform: rotate(360deg); }
+        }
+        @keyframes tw-ping {
+          75%, 100% { transform: scale(2); opacity: 0; }
+        }
+      }
+    }
+    
+    @layer utilities {
+      @variants {
+        .tw-animate-none { animation: none; }
+        .tw-animate-spin { animation: tw-spin 1s linear infinite; }
+        .tw-animate-ping { animation: tw-ping 1s cubic-bezier(0, 0, 0.2, 1) infinite; }
+      }
+    }  
+  `)
+})

src/plugins/animation.js

@@ -1,16 +1,26 @@
 import _ from 'lodash'
 import nameClass from '../util/nameClass'
+import parseAnimationValue from '../util/parseAnimationValue'
 
 export default function () {
-  return function ({ addUtilities, theme, variants }) {
+  return function ({ addUtilities, theme, variants, prefix }) {
+    const prefixName = (name) => prefix(`.${name}`).slice(1)
     const keyframesConfig = theme('keyframes')
-    const keyframesStyles = _.mapKeys(keyframesConfig, (_keyframes, name) => `@keyframes ${name}`)
+    const keyframesStyles = _.mapKeys(
+      keyframesConfig,
+      (_keyframes, name) => `@keyframes ${prefixName(name)}`
+    )
+
     addUtilities(keyframesStyles, { respectImportant: false })
 
     const animationConfig = theme('animation')
     const utilities = _.mapValues(
       _.mapKeys(animationConfig, (_animation, suffix) => nameClass('animate', suffix)),
-      (animation) => ({ animation })
+      (animation) => {
+        const { name } = parseAnimationValue(animation)
+        if (name === undefined) return { animation }
+        return { animation: animation.replace(name, prefixName(name)) }
+      }
     )
     addUtilities(utilities, variants('animation'))
   }