test: commonjs can be required

tests/commonjs.cjs

@@ -0,0 +1,21 @@
+"use strict";
+
+let AJQueryDefault = require("../");
+let AJQueryExplicit = require("../ajquery.cjs");
+
+if (!AJQueryDefault.$) {
+  throw new Error("did not export $ correctly");
+}
+if (!AJQueryDefault.$$) {
+  throw new Error("did not export $$ correctly");
+}
+
+if (AJQueryDefault.$ !== AJQueryExplicit.$) {
+  throw new Error("exported $s do not match");
+}
+
+if (AJQueryDefault.$$ !== AJQueryExplicit.$$) {
+  throw new Error("exported $$s do not match");
+}
+
+console.log(`\x1b[34mPASS\x1b[33m`);