From 367d29ecdf8aedda7a826fabf98a67dd07e64baa Mon Sep 17 00:00:00 2001
From: Jay Herron <NeedleInAJayStack@protonmail.com>
Date: Fri, 11 Sep 2026 10:51:07 -0600
Subject: [PATCH] fix: Build plugin detects changes to SDL `.graphql` and
 `.gql` files

Previously, changing an SDL file would not trigger a re-generation by the build plugin, which meant that the Swift protocols and the SDL could drift over cached builds.
---
 Plugins/GraphQLGeneratorPlugin.swift | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/Plugins/GraphQLGeneratorPlugin.swift b/Plugins/GraphQLGeneratorPlugin.swift
index fc80dcb..6d31c0c 100644
--- a/Plugins/GraphQLGeneratorPlugin.swift
+++ b/Plugins/GraphQLGeneratorPlugin.swift
@@ -38,7 +38,7 @@ struct GraphQLGeneratorPlugin: BuildToolPlugin {
             arguments += ["--config", configURL.path]
         }
 
-        let inputFiles: [URL] = configFile.map { [$0] } ?? []
+        let inputFiles = commandInputFiles(in: target.sourceFiles, configFile: configFile)
 
         return [
             .buildCommand(
@@ -57,6 +57,9 @@ struct GraphQLGeneratorPlugin: BuildToolPlugin {
         "graphql-generator-config.yml",
     ]
 
+    /// File extensions recognized as GraphQL schema files.
+    private static let schemaExtensions: Set<String> = ["graphql", "gql"]
+
     /// Finds the generator config file in the target's source files, if present.
     private func findConfigFile(in sourceFiles: FileList) -> URL? {
         let configs = sourceFiles.map(\.url).filter {
@@ -64,6 +67,14 @@ struct GraphQLGeneratorPlugin: BuildToolPlugin {
         }
         return configs.first
     }
+
+    /// Returns all files whose contents can affect generated output.
+    private func commandInputFiles(in sourceFiles: FileList, configFile: URL?) -> [URL] {
+        let schemaFiles = sourceFiles.map(\.url).filter {
+            Self.schemaExtensions.contains($0.pathExtension.lowercased())
+        }
+        return (configFile.map { [$0] } ?? []) + schemaFiles
+    }
 }
 
 #if canImport(XcodeProjectPlugin)
@@ -106,7 +117,10 @@ struct GraphQLGeneratorPlugin: BuildToolPlugin {
                 arguments += ["--config", configURL.path]
             }
 
-            let inputFiles: [URL] = configFile.map { [$0] } ?? []
+            let inputFiles = commandInputFiles(
+                in: target.inputFiles,
+                configFile: configFile
+            )
 
             return [
                 .buildCommand(