build(@vant/use): using babel to build

packages/vant-use/scripts/build.js

@@ -0,0 +1,41 @@
+const glob = require('fast-glob');
+const { join } = require('path');
+const { transformAsync } = require('@babel/core');
+const { readFileSync, outputFileSync } = require('fs-extra');
+
+const srcDir = join(__dirname, '..', 'src');
+const distDir = join(__dirname, '..', 'dist');
+const srcFiles = glob.sync(join(srcDir, '**', '*.ts'), {
+  ignore: ['**/node_modules', '**/*.spec.ts'],
+});
+
+const compile = (filePath, distDir) => {
+  return new Promise((resolve, reject) => {
+    const code = readFileSync(filePath, 'utf-8');
+    const distPath = filePath.replace(srcDir, distDir).replace('.ts', '.js');
+
+    transformAsync(code, { filename: filePath })
+      .then((result) => {
+        if (result) {
+          outputFileSync(distPath, result.code);
+          resolve();
+        }
+      })
+      .catch(reject);
+  });
+};
+
+async function build() {
+  // esm output
+  await Promise.all(
+    srcFiles.map((srcFile) => compile(srcFile, join(distDir, 'esm')))
+  );
+
+  // cjs output
+  process.env.BABEL_MODULE = 'commonjs';
+  await Promise.all(
+    srcFiles.map((srcFile) => compile(srcFile, join(distDir, 'cjs')))
+  );
+}
+
+build();