chore: put middlewares behind feature flag

src/packages/client/src/__tests__/runtime-tests/middlewares-manipulation/schema.prisma

@@ -6,7 +6,7 @@ datasource db {
 
 generator client {
   provider             = "prisma-client-js"
-  experimentalFeatures = ["aggregations"]
+  experimentalFeatures = ["aggregations", "middlewaresApi"]
 }
 
 // / User model comment

src/packages/client/src/__tests__/runtime-tests/middlewares/schema.prisma

@@ -6,7 +6,7 @@ datasource db {
 
 generator client {
   provider             = "prisma-client-js"
-  experimentalFeatures = ["transactionApi"]
+  experimentalFeatures = ["transactionApi", "middlewaresApi"]
 }
 
 // / User model comment

src/packages/client/src/__tests__/types/middlewares/schema.prisma

@@ -6,7 +6,7 @@ datasource db {
 generator client {
   provider             = "prisma-client-js"
   output               = "@prisma/client"
-  experimentalFeatures = ["aggregateApi"]
+  experimentalFeatures = ["aggregateApi", "middlewaresApi"]
 }
 
 // / User model comment

src/packages/client/src/generation/TSClient.ts

@@ -583,10 +583,16 @@ ${indent(this.jsDoc, tab)}
    */
   disconnect(): Promise<any>;
 
+  ${
+    this.generator?.previewFeatures?.includes('middlewaresApi')
+      ? `
   /**
    * Add a middleware
    */
   use(cb: Middleware): void
+  `
+      : ''
+  }
 
   /**
    * Executes a raw query and returns the number of affected rows

src/packages/client/src/runtime/getPrismaClient.ts

@@ -393,18 +393,24 @@ export function getPrismaClient(config: GetPrismaClientOptions): any {
     use(namespace: 'all', cb: Middleware)
     use(namespace: 'engine', cb: EngineMiddleware)
     use(namespace: HookPoint | Middleware, cb?: Middleware | EngineMiddleware) {
-      if (typeof namespace === 'function') {
-        this._middlewares.push(namespace)
-      } else if (typeof namespace === 'string') {
-        if (namespace === 'all') {
-          this._middlewares.push(cb! as Middleware)
-        } else if (namespace === 'engine') {
-          this._engineMiddlewares.push(cb! as EngineMiddleware)
+      if (config.generator?.previewFeatures?.includes('middlewaresApi')) {
+        if (typeof namespace === 'function') {
+          this._middlewares.push(namespace)
+        } else if (typeof namespace === 'string') {
+          if (namespace === 'all') {
+            this._middlewares.push(cb! as Middleware)
+          } else if (namespace === 'engine') {
+            this._engineMiddlewares.push(cb! as EngineMiddleware)
+          } else {
+            throw new Error(`Unknown middleware hook ${namespace}`)
+          }
         } else {
-          throw new Error(`Unknown middleware hook ${namespace}`)
+          throw new Error(`Invalid middleware ${namespace}`)
         }
       } else {
-        throw new Error(`Invalid middleware ${namespace}`)
+        throw new Error(
+          `In order to use the middlewares api, please enable set previewFeatures = ["middlewaresApi"]`,
+        )
       }
     }
     on(eventType: any, callback: (event: any) => void) {

src/packages/engine-core/src/NodeEngine.ts

@@ -160,6 +160,9 @@ export class NodeEngine {
     this.clientVersion = clientVersion
     this.flags = flags ?? []
     this.enableExperimental = enableExperimental ?? []
+    this.enableExperimental = this.enableExperimental.filter(
+      (e) => e !== 'middlewaresApi',
+    )
     this.engineEndpoint = engineEndpoint
 
     if (engineEndpoint) {