1 files changed, 101 insertions, 0 deletions
diff --git a/packages/integrations/vercel/src/lib/searchRoot.ts b/packages/integrations/vercel/src/lib/searchRoot.ts
new file mode 100644
index 000000000..832f6e498
--- /dev/null
+++ b/packages/integrations/vercel/src/lib/searchRoot.ts
@@ -0,0 +1,101 @@
+// Taken from: https://github.com/vitejs/vite/blob/1a76300cd16827f0640924fdc21747ce140c35fb/packages/vite/src/node/server/searchRoot.ts
+// MIT license
+// See https://github.com/vitejs/vite/blob/1a76300cd16827f0640924fdc21747ce140c35fb/LICENSE
+import fs from 'node:fs';
+import { dirname, join } from 'node:path';
+
+// https://github.com/vitejs/vite/issues/2820#issuecomment-812495079
+const ROOT_FILES = [
+	// '.git',
+
+	// https://pnpm.io/workspaces/
+	'pnpm-workspace.yaml',
+
+	// https://rushjs.io/pages/advanced/config_files/
+	// 'rush.json',
+
+	// https://nx.dev/latest/react/getting-started/nx-setup
+	// 'workspace.json',
+	// 'nx.json',
+
+	// https://github.com/lerna/lerna#lernajson
+	'lerna.json',
+];
+
+export function tryStatSync(file: string): fs.Stats | undefined {
+	try {
+		// The "throwIfNoEntry" is a performance optimization for cases where the file does not exist
+		return fs.statSync(file, { throwIfNoEntry: false });
+	} catch {
+		// Ignore errors
+	}
+}
+
+export function isFileReadable(filename: string): boolean {
+	if (!tryStatSync(filename)) {
+		return false;
+	}
+
+	try {
+		// Check if current process has read permission to the file
+		fs.accessSync(filename, fs.constants.R_OK);
+
+		return true;
+	} catch {
+		return false;
+	}
+}
+
+// npm: https://docs.npmjs.com/cli/v7/using-npm/workspaces#installing-workspaces
+// yarn: https://classic.yarnpkg.com/en/docs/workspaces/#toc-how-to-use-it
+function hasWorkspacePackageJSON(root: string): boolean {
+	const path = join(root, 'package.json');
+	if (!isFileReadable(path)) {
+		return false;
+	}
+	try {
+		const content = JSON.parse(fs.readFileSync(path, 'utf-8')) || {};
+		return !!content.workspaces;
+	} catch {
+		return false;
+	}
+}
+
+function hasRootFile(root: string): boolean {
+	return ROOT_FILES.some((file) => fs.existsSync(join(root, file)));
+}
+
+function hasPackageJSON(root: string) {
+	const path = join(root, 'package.json');
+	return fs.existsSync(path);
+}
+
+/**
+ * Search up for the nearest `package.json`
+ */
+export function searchForPackageRoot(current: string, root = current): string {
+	if (hasPackageJSON(current)) return current;
+
+	const dir = dirname(current);
+	// reach the fs root
+	if (!dir || dir === current) return root;
+
+	return searchForPackageRoot(dir, root);
+}
+
+/**
+ * Search up for the nearest workspace root
+ */
+export function searchForWorkspaceRoot(
+	current: string,
+	root = searchForPackageRoot(current)
+): string {
+	if (hasRootFile(current)) return current;
+	if (hasWorkspacePackageJSON(current)) return current;
+
+	const dir = dirname(current);
+	// reach the fs root
+	if (!dir || dir === current) return root;
+
+	return searchForWorkspaceRoot(dir, root);
+}