feat: 添加 global css 的能力

packages/fes-preset-built-in/src/index.js

@@ -28,6 +28,7 @@ export default function () {
             require.resolve('./plugins/features/extraBabelPresets'),
             require.resolve('./plugins/features/extraPostCSSPlugins'),
             require.resolve('./plugins/features/html'),
+            require.resolve('./plugins/features/globalCSS'),
             require.resolve('./plugins/features/inlineLimit'),
             require.resolve('./plugins/features/lessLoader'),
             require.resolve('./plugins/features/mountElementId'),

packages/fes-preset-built-in/src/plugins/features/globalCSS.js

@@ -0,0 +1,25 @@
+import { relative, join } from 'path';
+import { existsSync } from 'fs';
+
+export default (api) => {
+    const {
+        paths,
+        utils: { winPath }
+    } = api;
+    const { absSrcPath = '', absTmpPath = '' } = paths;
+    const files = [
+        'global.css',
+        'global.less',
+        'global.stylus'
+    ];
+    const globalCSSFile = files
+        .map(file => join(absSrcPath || '', file))
+        .filter(file => existsSync(file))
+        .slice(0, 1);
+
+    api.addEntryCodeAhead(
+        () => `${globalCSSFile
+            .map(file => `require('${winPath(relative(absTmpPath, file))}');`)
+            .join('')}`
+    );
+};