feat(@vant/cli): using esbuild to minify css (#10204)

packages/vant-cli/src/compiler/compile-css.ts

@@ -1,15 +1,17 @@
 import postcss from 'postcss';
 import postcssrc from 'postcss-load-config';
-import CleanCss from 'clean-css';
+import { transform } from 'esbuild';
 import { POSTCSS_CONFIG_FILE } from '../common/constant.js';
 
-const cleanCss = new CleanCss();
-
 export async function compileCss(source: string | Buffer) {
   const config = await postcssrc({}, POSTCSS_CONFIG_FILE);
   const { css } = await postcss(config.plugins as any).process(source, {
     from: undefined,
   });
-
-  return cleanCss.minify(css).styles;
+  const result = await transform(css, {
+    loader: 'css',
+    minify: true,
+    target: ['chrome53', 'safari10'],
+  });
+  return result.code;
 }

packages/vant-cli/src/module.d.ts

@@ -1,7 +1,6 @@
 // some modules with missing type definitions
 declare module 'execa';
 declare module 'hash-sum';
-declare module 'clean-css';
 declare module 'release-it';
 declare module 'conventional-changelog';
 declare module '@vant/markdown-vetur';