From 5d6b6d90f225c66d4f42617be22e75dce803165b Mon Sep 17 00:00:00 2001
From: Ante Sepic <antesepic@protonmail.com>
Date: Thu, 12 Oct 2023 21:22:56 +0200
Subject: [PATCH] fix(watcher): fix watcher unable to find common directory on
 Windows (#9698)

---
 .changeset/stupid-onions-tap.md                   | 5 +++++
 packages/graphql-codegen-cli/src/utils/watcher.ts | 6 +++++-
 2 files changed, 10 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/stupid-onions-tap.md

diff --git a/.changeset/stupid-onions-tap.md b/.changeset/stupid-onions-tap.md
new file mode 100644
index 00000000000..dbc0621999a
--- /dev/null
+++ b/.changeset/stupid-onions-tap.md
@@ -0,0 +1,5 @@
+---
+'@graphql-codegen/cli': patch
+---
+
+fix watcher unable to find highest common directory on Windows
diff --git a/packages/graphql-codegen-cli/src/utils/watcher.ts b/packages/graphql-codegen-cli/src/utils/watcher.ts
index b2420f65cfa..bef6702414d 100644
--- a/packages/graphql-codegen-cli/src/utils/watcher.ts
+++ b/packages/graphql-codegen-cli/src/utils/watcher.ts
@@ -229,7 +229,11 @@ const findHighestCommonDirectory = async (files: string[]): Promise<string> => {
   // e.g. mm.scan("/**/foo/bar").base -> "/" ; mm.scan("/foo/bar/**/fizz/*.graphql") -> /foo/bar
   const dirPaths = files
     .map(filePath => (isAbsolute(filePath) ? filePath : resolve(filePath)))
-    .map(patterned => mm.scan(patterned).base);
+    // mm.scan doesn't know how to handle Windows \ path separator
+    .map(patterned => patterned.replace(/\\/g, '/'))
+    .map(patterned => mm.scan(patterned).base)
+    // revert the separators to the platform-supported ones
+    .map(base => base.replace(/\//g, sep));
 
   // Return longest common prefix if it's accessible, otherwise process.cwd()
   return (async (maybeValidPath: string) => {