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lib/as-text-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 { promises as fs } from 'fs';
+
+const prefix = 'as-text:';
+
+export default function dataURLPlugin() {
+  return {
+    name: 'as-text-plugin',
+    async resolveId(id, importer) {
+      if (!id.startsWith(prefix)) return;
+      const realId = id.slice(prefix.length);
+      const resolveResult = await this.resolve(realId, importer);
+      if (!resolveResult) throw Error(`Cannot find ${realId} from ${importer}`);
+      return prefix + resolveResult.id;
+    },
+    async load(id) {
+      if (!id.startsWith(prefix)) return;
+
+      const realId = id.slice(prefix.length);
+      this.addWatchFile(realId);
+
+      const source = await fs.readFile(realId, { encoding: 'utf-8' });
+
+      return `export default ${JSON.stringify(source)}`;
+    },
+  };
+}