1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/shell/ModuleLoader.js b/js/src/shell/ModuleLoader.js
new file mode 100644
index 000000000..d8767f05f
--- /dev/null
+++ b/js/src/shell/ModuleLoader.js
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// A basic synchronous module loader for testing the shell.
+
+Reflect.Loader = new class {
+    constructor() {
+        this.registry = new Map();
+        this.loadPath = getModuleLoadPath();
+    }
+
+    resolve(name) {
+        if (os.path.isAbsolute(name))
+            return name;
+
+        return os.path.join(this.loadPath, name);
+    }
+
+    fetch(path) {
+        return os.file.readFile(path);
+    }
+
+    loadAndParse(name) {
+        let path = this.resolve(name);
+
+        if (this.registry.has(path))
+            return this.registry.get(path);
+
+        let source = this.fetch(path);
+        let module = parseModule(source, path);
+        this.registry.set(path, module);
+        return module;
+    }
+
+    ["import"](name, referrer) {
+        let module = this.loadAndParse(name);
+        module.declarationInstantiation();
+        return module.evaluation();
+    }
+};
+
+setModuleResolveHook((module, requestName) => Reflect.Loader.loadAndParse(requestName));