update

ts/tiny-readdir/utils.ts

@@ -0,0 +1,43 @@
+
+/* IMPORT */
+
+import makeNakedPromise from '../promise-make-naked/index.js';
+import type {Callback} from './types.js';
+
+/* MAIN */
+
+const isFunction = ( value: unknown ): value is Function => {
+
+  return ( typeof value === 'function' );
+
+};
+
+const makeCounterPromise = (): { promise: Promise<void>, increment: Callback, decrement: Callback } => {
+
+  const {promise, resolve} = makeNakedPromise<void> ();
+
+  let counter = 0;
+
+  const increment = (): void => {
+
+    counter += 1;
+
+  };
+
+  const decrement = (): void => {
+
+    counter -= 1;
+
+    if ( counter ) return;
+
+    resolve ();
+
+  };
+
+  return { promise, increment, decrement };
+
+};
+
+/* EXPORT */
+
+export {isFunction, makeCounterPromise};