From a8db8244a3aa0f7ce220ebf97f0050d3569d4233 Mon Sep 17 00:00:00 2001
From: Wesley Luyten <me@wesleyluyten.com>
Date: Sun, 5 May 2024 09:50:54 -0500
Subject: [PATCH] fix: async function as next config (#252)

fix #251
---
 examples/default-provider/next.config.mjs |  4 +++-
 src/config.ts                             | 16 ++++++++++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/examples/default-provider/next.config.mjs b/examples/default-provider/next.config.mjs
index 33337f7..f68dce7 100644
--- a/examples/default-provider/next.config.mjs
+++ b/examples/default-provider/next.config.mjs
@@ -2,7 +2,9 @@ import { withNextVideo } from 'next-video/process';
 /** @type {import('next').NextConfig} */
 const nextConfig = {};
 
-export default withNextVideo(nextConfig);
+export default async function config() {
+  return withNextVideo(nextConfig);
+}
 
 // Amazon S3 example
 // export default withNextVideo(nextConfig, {
diff --git a/src/config.ts b/src/config.ts
index edaf48c..c65eb09 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -1,7 +1,8 @@
-import { env, cwd } from 'node:process';
+import { cwd } from 'node:process';
 import path from 'node:path';
 import { pathToFileURL } from 'node:url';
-import nextConfig from 'next/config.js'
+import nextConfig from 'next/config.js';
+import type { NextConfig } from 'next';
 // @ts-ignore
 const getConfig = nextConfig.default;
 
@@ -68,7 +69,7 @@ export const videoConfigDefault: VideoConfigComplete = {
  * The video config is then stored as an environment variable __NEXT_VIDEO_OPTS.
  */
 export async function getVideoConfig(): Promise<VideoConfigComplete> {
-  let nextConfig = getConfig();
+  let nextConfig: NextConfig | undefined = getConfig();
 
   if (!nextConfig?.serverRuntimeConfig?.nextVideo) {
     try {
@@ -88,5 +89,12 @@ export async function getVideoConfig(): Promise<VideoConfigComplete> {
 async function importConfig(file: string) {
   const absFilePath = path.resolve(cwd(), file);
   const fileUrl = pathToFileURL(absFilePath).href;
-  return (await import(/* webpackIgnore: true */ fileUrl))?.default;
+
+  const mod = await import(/* webpackIgnore: true */ fileUrl);
+  const config: (() => NextConfig) | NextConfig | undefined = mod?.default;
+
+  if (typeof config === 'function') {
+    return config();
+  }
+  return config;
 }