Rollup build

lib/initial-css-plugin.js

@@ -0,0 +1,54 @@
+/**
+ * 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 { promisify } from 'util';
+
+import path from 'path';
+import { posix } from 'path';
+import glob from 'glob';
+
+const globP = promisify(glob);
+
+const moduleId = 'initial-css:';
+
+export default function initialCssPlugin() {
+  return {
+    name: 'initial-css-plugin',
+    resolveId(id) {
+      if (id === moduleId) return moduleId;
+    },
+    async load(id) {
+      if (id !== moduleId) return;
+
+      const matches = await globP('shared/initial-app/**/*.css', {
+        nodir: true,
+        cwd: path.join(process.cwd(), 'src'),
+      });
+
+      // Sort the matches so the parentmost items appear first.
+      // This is a bit of a hack, but it means the util stuff appears in the cascade first.
+      const sortedMatches = matches
+        .map((match) => path.normalize(match).split(path.sep))
+        .sort((a, b) => a.length - b.length)
+        .map((match) => posix.join(...match));
+
+      const imports = sortedMatches
+        .map((id, i) => `import css${i} from 'css:${id}';\n`)
+        .join('');
+
+      return (
+        imports +
+        `export default ${sortedMatches.map((_, i) => `css${i}`).join(' + ')};`
+      );
+    },
+  };
+}