refactor: Rename runtime/rt to runtime/js (#8806)

runtime/js/01_internals.js

@@ -0,0 +1,23 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+((window) => {
+  const internalSymbol = Symbol("Deno.internal");
+
+  // The object where all the internal fields for testing will be living.
+  const internalObject = {};
+
+  // Register a field to internalObject for test access,
+  // through Deno[Deno.internal][name].
+  function exposeForTest(name, value) {
+    Object.defineProperty(internalObject, name, {
+      value,
+      enumerable: false,
+    });
+  }
+
+  window.__bootstrap.internals = {
+    internalSymbol,
+    internalObject,
+    exposeForTest,
+  };
+})(this);