run npm install to generate a package lock

node_modules/function-once/dist/index.d.ts

@@ -0,0 +1,2 @@
+declare const once: <T>(fn: () => T) => () => T;
+export default once;

node_modules/function-once/dist/index.js

@@ -0,0 +1,14 @@
+/* MAIN */
+const once = (fn) => {
+    let called = false;
+    let result;
+    return () => {
+        if (!called) {
+            called = true;
+            result = fn();
+        }
+        return result;
+    };
+};
+/* EXPORT */
+export default once;