print warning in case developers are using a different package manage…

…r to run @cloudflare/next-on-pages (#554)

.changeset/blue-seals-fail.md

@@ -0,0 +1,5 @@
+---
+'@cloudflare/next-on-pages': patch
+---
+
+print warning in case developers are using a different package manager to run @cloudflare/next-on-pages

packages/next-on-pages/src/buildApplication/buildApplication.ts

@@ -3,7 +3,7 @@ import { join, resolve } from 'path';
 import { cp } from 'fs/promises';
 import { getPackageManager } from 'package-manager-manager';
 import type { CliOptions } from '../cli';
-import { cliError, cliLog, cliSuccess } from '../cli';
+import { cliError, cliLog, cliSuccess, cliWarn } from '../cli';
 import { getVercelConfig } from './getVercelConfig';
 import { buildWorkerFile } from './buildWorkerFile';
 import { buildVercelOutput } from './buildVercelOutput';
@@ -43,6 +43,15 @@ export async function buildApplication({
 		throw new Error('Error: Could not detect current package manager in use');
 	}
 
+	if (pm.projectPackageManager && pm.name !== pm.projectPackageManager) {
+		cliWarn(
+			`The project is set up for ${pm.projectPackageManager} but it is currently being run` +
+				` via ${pm.name} this might lead to build errors, please be sure to use the same package manager` +
+				` your project uses when running @cloudflare/next-on-pages`,
+			{ spaced: true },
+		);
+	}
+
 	let buildSuccess = true;
 	if (!skipBuild) {
 		try {