Add warnings to experimental features (mounts & service bindings)

Author: mrbbot

packages/core/src/plugins/bindings.ts

@@ -218,6 +218,12 @@ export class BindingsPlugin
         (typeof options === "object" && options.environment) || "production";
       return { name, service, environment };
     });
+    if (this.#processedServiceBindings.length) {
+      ctx.log.warn(
+        "Service bindings are experimental and primarily meant for internal " +
+          "testing at the moment. There may be breaking changes in the future."
+      );
+    }
   }
 
   #getServiceFetch = async (service: string): Promise<FetcherFetch> => {

packages/core/src/plugins/core.ts

@@ -347,6 +347,11 @@ export class CorePlugin extends Plugin<CoreOptions> implements CoreOptions {
   constructor(ctx: PluginContext, options?: CoreOptions) {
     super(ctx);
     this.assignOptions(options);
+    if (this.mounts && Object.keys(this.mounts).length) {
+      ctx.log.warn(
+        "Mounts are experimental. There may be breaking changes in the future."
+      );
+    }
 
     // Make sure the kFormDataFiles flag is set correctly when constructing
     let CompatRequest = Request;

packages/core/test/index.mounts.spec.ts

@@ -383,6 +383,10 @@ test("MiniflareCore: dispose: disposes of mounts too", async (t) => {
     [LogLevel.DEBUG, "Options:"],
     [LogLevel.DEBUG, "- Mounts: test"],
     [LogLevel.DEBUG, "Enabled Compatibility Flags: <none>"],
+    [
+      LogLevel.WARN,
+      "Mounts are experimental. There may be breaking changes in the future.",
+    ],
     [LogLevel.VERBOSE, "- setup(CorePlugin)"],
     [LogLevel.DEBUG, 'Mounting "test"...'],
     [LogLevel.DEBUG, "Initialising worker..."],