fix(next): #397 double execution if next.config.ts is used on canary

Closes: #397

.changeset/odd-bikes-rule.md

@@ -0,0 +1,5 @@
+---
+"@content-collections/next": patch
+---
+
+Fix double execution if next.config.ts is used on canary #397

packages/next/src/index.ts

@@ -9,20 +9,23 @@ const defaultOptions: Options = {
   configPath: "content-collections.ts",
 };
 
+const initializedState: Record<string, boolean> = {};
+
 export function createContentCollectionPlugin(pluginOptions: Options) {
-  let initialized = false;
   return async (
     nextConfig: Partial<NextConfig> | Promise<Partial<NextConfig>> = {},
   ): Promise<Partial<NextConfig>> => {
     const [command] = process.argv
       .slice(2)
       .filter((arg) => !arg.startsWith("-"));
     if (command === "build" || command === "dev") {
+      const initialized = initializedState[pluginOptions.configPath];
+
       if (initialized) {
         return nextConfig;
       }
 
-      initialized = true;
+      initializedState[pluginOptions.configPath] = true;
 
       const { createBuilder } = await import("@content-collections/core");