feat: support absolute paths when compiling opennext configs

Author: james-elicx

.changeset/three-oranges-whisper.md

@@ -0,0 +1,5 @@
+---
+"@opennextjs/aws": minor
+---
+
+feat: support absolute paths when compiling opennext configs

packages/open-next/src/build.ts

@@ -1,3 +1,4 @@
+import path from "node:path";
 import url from "node:url";
 
 import {
@@ -32,8 +33,9 @@ export async function build(
   const openNextDistDir = url.fileURLToPath(new URL(".", import.meta.url));
 
   const { config, buildDir } = await compileOpenNextConfig(
-    baseDir,
-    openNextConfigPath,
+    openNextConfigPath && path.isAbsolute(openNextConfigPath)
+      ? openNextConfigPath
+      : path.join(baseDir, openNextConfigPath ?? "open-next.config.ts"),
     { nodeExternals },
   );
 

packages/open-next/src/build/compileConfig.ts

@@ -13,22 +13,15 @@ import { validateConfig } from "./validateConfig.js";
  *
  * The configuration is always compiled for Node.js and for the edge only if needed.
  *
- * @param baseDir Directory where to look for the configuration.
- * @param openNextConfigPath Override the default configuration when provided. Relative to baseDir.
+ * @param sourcePath Path to the configuration file.
  * @param nodeExternals Coma separated list of Externals for the Node.js compilation.
  * @param compileEdge Force compiling for the edge runtime when true
  * @return The configuration and the build directory.
  */
 export async function compileOpenNextConfig(
-  baseDir: string,
-  openNextConfigPath?: string,
+  sourcePath: string,
   { nodeExternals = "", compileEdge = false } = {},
 ) {
-  const sourcePath = path.join(
-    baseDir,
-    openNextConfigPath ?? "open-next.config.ts",
-  );
-
   const buildDir = fs.mkdtempSync(path.join(os.tmpdir(), "open-next-tmp"));
   let configPath = compileOpenNextConfigNode(
     sourcePath,