feat(cli): import base css

packages/vant-cli/src/common/css.ts

@@ -0,0 +1,33 @@
+import { get } from 'lodash';
+import { join, isAbsolute } from 'path';
+import { CONFIG, STYLE_DIR, SRC_DIR } from './constant';
+import { existsSync } from 'fs';
+
+type CSS_LANG = 'css' | 'less' | 'scss';
+
+function getCssLang(): CSS_LANG {
+  const preprocessor = get(CONFIG, 'build.css.preprocessor', 'less');
+
+  if (preprocessor === 'sass') {
+    return 'scss';
+  }
+
+  return preprocessor;
+}
+
+export const CSS_LANG = getCssLang();
+
+export function getCssBaseFile() {
+  let path = join(STYLE_DIR, `base.${CSS_LANG}`);
+
+  const baseFile = get(CONFIG, 'build.css.base', '');
+  if (baseFile) {
+    path = isAbsolute(baseFile) ? baseFile : join(SRC_DIR, baseFile);
+  }
+
+  if (existsSync(path)) {
+    return path;
+  }
+
+  return null;
+}