diff --git a/packages/remix-server-runtime/crypto.ts b/packages/remix-server-runtime/crypto.ts
index 58d333033dd..c28c2717677 100644
--- a/packages/remix-server-runtime/crypto.ts
+++ b/packages/remix-server-runtime/crypto.ts
@@ -1,14 +1,14 @@
-import type { PromiseOrSync } from "./utils";
+import type { Promisable } from "type-fest";
 
 export type SignFunction = (
   value: string,
   secret: string
-) => PromiseOrSync<string>;
+) => Promisable<string>;
 
 export type UnsignFunction = (
   cookie: string,
   secret: string
-) => PromiseOrSync<string | false>;
+) => Promisable<string | false>;
 
 // TODO: Once node v16 is available on AWS we should use the globally provided
 // webcrypto "crypto" variable and re-enable this code-path in "./cookies.ts"
diff --git a/packages/remix-server-runtime/sessions.ts b/packages/remix-server-runtime/sessions.ts
index a56372197d4..7dcf4344d88 100644
--- a/packages/remix-server-runtime/sessions.ts
+++ b/packages/remix-server-runtime/sessions.ts
@@ -1,9 +1,9 @@
 import type { CookieParseOptions, CookieSerializeOptions } from "cookie";
+import type { Promisable } from "type-fest";
 
 import type { Cookie, CookieOptions, CreateCookieFunction } from "./cookies";
 import { isCookie } from "./cookies";
 import { warnOnce } from "./warnings";
-import type { PromiseOrSync } from "./utils";
 
 /**
  * An object of name/value pairs to be used in the session.
@@ -224,14 +224,14 @@ export interface SessionIdStorageStrategy<
   createData: (
     data: FlashSessionData<Data, FlashData>,
     expires?: Date
-  ) => PromiseOrSync<string>;
+  ) => Promisable<string>;
 
   /**
    * Returns data for a given session id, or `null` if there isn't any.
    */
   readData: (
     id: string
-  ) => PromiseOrSync<FlashSessionData<Data, FlashData> | null>;
+  ) => Promisable<FlashSessionData<Data, FlashData> | null>;
 
   /**
    * Updates data for the given session id.
@@ -240,12 +240,12 @@ export interface SessionIdStorageStrategy<
     id: string,
     data: FlashSessionData<Data, FlashData>,
     expires?: Date
-  ) => PromiseOrSync<void>;
+  ) => Promisable<void>;
 
   /**
    * Deletes data for a given session id from the data store.
    */
-  deleteData: (id: string) => PromiseOrSync<void>;
+  deleteData: (id: string) => Promisable<void>;
 }
 
 export type CreateSessionStorageFunction = <
diff --git a/packages/remix-server-runtime/utils.ts b/packages/remix-server-runtime/utils.ts
deleted file mode 100644
index ad9891bd8eb..00000000000
--- a/packages/remix-server-runtime/utils.ts
+++ /dev/null
@@ -1 +0,0 @@
-export type PromiseOrSync<T> = Promise<T> | T;