diff --git a/lib/child_process.js b/lib/child_process.js
index f51072126e21cd..6f054923dcde95 100644
--- a/lib/child_process.js
+++ b/lib/child_process.js
@@ -47,6 +47,7 @@ const {
 const {
   promisify,
   convertToValidSignal,
+  createInvertedPromise,
   getSystemErrorName
 } = require('internal/util');
 const { isArrayBufferView } = require('internal/util/types');
@@ -184,12 +185,7 @@ function exec(command, options, callback) {
 
 const customPromiseExecFunction = (orig) => {
   return (...args) => {
-    let resolve;
-    let reject;
-    const promise = new Promise((res, rej) => {
-      resolve = res;
-      reject = rej;
-    });
+    const { promise, resolve, reject } = createInvertedPromise();
 
     promise.child = orig(...args, (err, stdout, stderr) => {
       if (err !== null) {
diff --git a/lib/internal/blob.js b/lib/internal/blob.js
index e49b3710e0768a..b0d10bdfc4ea91 100644
--- a/lib/internal/blob.js
+++ b/lib/internal/blob.js
@@ -29,6 +29,7 @@ const {
 } = require('internal/util/types');
 
 const {
+  createInvertedPromise,
   customInspectSymbol: kInspect,
   emitExperimentalWarning,
 } = require('internal/util');
@@ -56,15 +57,6 @@ const kLength = Symbol('kLength');
 
 let Buffer;
 
-function deferred() {
-  let res, rej;
-  const promise = new Promise((resolve, reject) => {
-    res = resolve;
-    rej = reject;
-  });
-  return { promise, resolve: res, reject: rej };
-}
-
 function lazyBuffer() {
   if (Buffer === undefined)
     Buffer = require('buffer').Buffer;
@@ -210,7 +202,7 @@ class Blob extends JSTransferable {
       promise,
       resolve,
       reject
-    } = deferred();
+    } = createInvertedPromise();
     job.ondone = (err, ab) => {
       if (err !== undefined)
         return reject(new AbortError());
diff --git a/lib/internal/util.js b/lib/internal/util.js
index 5d5a2b14a708b4..f18ac0f698705a 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -420,11 +420,23 @@ function sleep(msec) {
   _sleep(msec);
 }
 
+function createInvertedPromise() {
+  let resolve;
+  let reject;
+  const promise = new Promise((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+
+  return { promise, resolve, reject };
+}
+
 module.exports = {
   assertCrypto,
   cachedResult,
   convertToValidSignal,
   createClassWrapper,
+  createInvertedPromise,
   decorateErrorStack,
   deprecate,
   emitExperimentalWarning,