fix: 压缩css, fix #12

Author: jinzhan

scripts/lib/rollup.js

@@ -4,6 +4,7 @@
  **/
 
 const path = require('path');
+const fs = require('fs');
 const rollup = require('rollup').rollup;
 const postcss = require('rollup-plugin-postcss');
 const peerDepsExternal = require('rollup-plugin-peer-deps-external');
@@ -12,6 +13,7 @@ const babel = require('rollup-plugin-babel');
 const commonjs = require('rollup-plugin-commonjs');
 const {terser} = require('rollup-plugin-terser');
 const svgo = require('rollup-plugin-svgo');
+const cssnano = require('cssnano');
 
 module.exports = async (dest, src) => {
     const inputOptions = {
@@ -34,23 +36,28 @@ module.exports = async (dest, src) => {
             })
         ]
     };
-
+    
     const outputMin = {
         file: path.join(dest, 'santd.min.js'),
         name: 'santd',
         exports: 'named',
         format: 'umd',
-        plugins: [terser()]
+        plugins: [
+            terser()
+        ]
     };
-
     const output = {
         file: path.join(dest, 'santd.js'),
         name: 'santd',
         exports: 'named',
         format: 'umd'
     };
-
     const bundle = await rollup(inputOptions);
     await bundle.write(outputMin);
     await bundle.write(output);
+
+    // 压缩 https://github.com/egoist/rollup-plugin-postcss/blob/master/src/index.js#L236
+    let code = fs.readFileSync(path.join(dest, 'santd.css'));
+    let result = await cssnano.process(code, {from: 'santd.css'});
+    fs.writeFileSync(path.join(dest, 'santd.min.css'), result.css);
 };