build: add files of vant-cli 2

packages/vant-cli/src/commands/build.ts

@@ -0,0 +1,54 @@
+import { join } from 'path';
+import { remove, copy, readdirSync } from 'fs-extra';
+import { clean } from './clean';
+import { compileJs } from '../compiler/compile-js';
+import { compileSfc } from '../compiler/compile-sfc';
+import { compileStyle } from '../compiler/compile-style';
+import { SRC_DIR, LIB_DIR, ES_DIR } from '../common/constant';
+import {
+  isDir,
+  isSfc,
+  isDemoDir,
+  isTestDir,
+  isScript,
+  isStyle
+} from '../common';
+
+async function compileDir(dir: string) {
+  const files = readdirSync(dir);
+
+  files.forEach(async filename => {
+    const filePath = join(dir, filename);
+
+    if (isDemoDir(filePath) || isTestDir(filePath)) {
+      await remove(filePath);
+    } else if (isDir(filePath)) {
+      await compileDir(filePath);
+    } else if (isSfc(filePath)) {
+      await compileSfc(filePath);
+    } else if (isScript(filePath)) {
+      await compileJs(filePath);
+    } else if (isStyle(filePath)) {
+      await compileStyle(filePath);
+    } else {
+      await remove(filePath);
+    }
+  });
+}
+
+function setModuleEnv(value: string) {
+  process.env.BABEL_MODULE = value;
+}
+
+export async function build() {
+  clean();
+
+  await copy(SRC_DIR, ES_DIR);
+  await copy(SRC_DIR, LIB_DIR);
+
+  setModuleEnv('esmodule');
+  await compileDir(ES_DIR);
+
+  setModuleEnv('commonjs');
+  await compileDir(LIB_DIR);
+}