1 files changed, 21 insertions, 0 deletions
diff --git a/extensions/fetch/01_fetch_util.js b/extensions/fetch/01_fetch_util.js
new file mode 100644
index 000000000..ff76421a1
--- /dev/null
+++ b/extensions/fetch/01_fetch_util.js
@@ -0,0 +1,21 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+"use strict";
+
+((window) => {
+  function requiredArguments(
+    name,
+    length,
+    required,
+  ) {
+    if (length < required) {
+      const errMsg = `${name} requires at least ${required} argument${
+        required === 1 ? "" : "s"
+      }, but only ${length} present`;
+      throw new TypeError(errMsg);
+    }
+  }
+
+  window.__bootstrap.fetchUtil = {
+    requiredArguments,
+  };
+})(this);