Rollup build

lib/emit-files-plugin.js

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+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import * as path from 'path';
+import { promises as fs } from 'fs';
+import glob from 'glob';
+import { promisify } from 'util';
+
+const globP = promisify(glob);
+
+export default function emitFiles({ root, include }) {
+  return {
+    name: 'emit-files-plugin',
+    async buildStart() {
+      const paths = await globP(include, { nodir: true, cwd: root });
+
+      await Promise.all(
+        paths.map(async (filePath) => {
+          return this.emitFile({
+            type: 'asset',
+            source: await fs.readFile(path.join(root, filePath)),
+            fileName: 'static/' + filePath,
+          });
+        }),
+      );
+    },
+  };
+}