first commit

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

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+import { get } from 'lodash';
+import { existsSync } from 'fs';
+import { join, isAbsolute } from 'path';
+import { getVantConfig } from '../common';
+import { STYLE_DIR, SRC_DIR } from './constant';
+
+type CSS_LANG = 'css' | 'less' | 'scss';
+
+function getCssLang(): CSS_LANG {
+  const vantConfig = getVantConfig();
+  const preprocessor = get(vantConfig, 'build.css.preprocessor', 'less');
+
+  if (preprocessor === 'sass') {
+    return 'scss';
+  }
+
+  return preprocessor;
+}
+
+export const CSS_LANG = getCssLang();
+
+export function getCssBaseFile() {
+  const vantConfig = getVantConfig();
+  let path = join(STYLE_DIR, `base.${CSS_LANG}`);
+
+  const baseFile = get(vantConfig, 'build.css.base', '');
+  if (baseFile) {
+    path = isAbsolute(baseFile) ? baseFile : join(SRC_DIR, baseFile);
+  }
+
+  if (existsSync(path)) {
+    return path;
+  }
+
+  return null;
+}
+
+const IMPORT_STYLE_RE = /import\s+?(?:(?:".*?")|(?:'.*?'))[\s]*?(?:;|$|)/g;
+
+// "import 'a.less';" => "import 'a.css';"
+export function replaceCssImport(code: string) {
+  return code.replace(IMPORT_STYLE_RE, str =>
+    str.replace(`.${CSS_LANG}`, '.css')
+  );
+}