diff --git a/test/types/api.test-d.ts b/test/types/api.test-d.ts
index c64b1315018..85d5e6723a5 100644
--- a/test/types/api.test-d.ts
+++ b/test/types/api.test-d.ts
@@ -1,5 +1,5 @@
 import { Duplex, Readable, Writable } from 'stream'
-import { expectAssignable } from 'tsd'
+import { expectAssignable, expectType } from 'tsd'
 import { Dispatcher, request, stream, pipeline, connect, upgrade } from '../..'
 
 // request
@@ -10,12 +10,22 @@ expectAssignable<Promise<Dispatcher.ResponseData>>(request('', { method: 'GET',
 // stream
 expectAssignable<Promise<Dispatcher.StreamData>>(stream('', { method: 'GET' }, data => {
   expectAssignable<Dispatcher.StreamFactoryData>(data)
+  expectType<null>(data.opaque)
+  return new Writable()
+}))
+expectAssignable<Promise<Dispatcher.StreamData<{ example: string }>>>(stream('', { method: 'GET', opaque: { example: '' } }, data => {
+  expectType<{ example: string }>(data.opaque)
   return new Writable()
 }))
 
 // pipeline
 expectAssignable<Duplex>(pipeline('', { method: 'GET' }, data => {
   expectAssignable<Dispatcher.PipelineHandlerData>(data)
+  expectType<null>(data.opaque)
+  return new Readable()
+}))
+expectAssignable<Duplex>(pipeline('', { method: 'GET', opaque: { example: '' } }, data => {
+  expectType<{ example: string }>(data.opaque)
   return new Readable()
 }))
 
diff --git a/test/types/dispatcher.test-d.ts b/test/types/dispatcher.test-d.ts
index 057cfe66d8f..303abd0ade7 100644
--- a/test/types/dispatcher.test-d.ts
+++ b/test/types/dispatcher.test-d.ts
@@ -66,6 +66,7 @@ expectAssignable<Dispatcher>(new Dispatcher())
   }))
   expectAssignable<Promise<Dispatcher.ResponseData>>(dispatcher.request({ origin: '', path: '', method: 'GET', responseHeaders: 'raw' }))
   expectAssignable<Promise<Dispatcher.ResponseData>>(dispatcher.request({ origin: '', path: '', method: 'GET', responseHeaders: null }))
+  expectAssignable<Promise<Dispatcher.ResponseData<{ example: string }>>>(dispatcher.request({ origin: '', path: '', method: 'GET', opaque: { example: '' } }))
 
   // pipeline
   expectAssignable<Duplex>(dispatcher.pipeline({ origin: '', path: '', method: 'GET', maxRedirections: 0 }, data => {
@@ -84,6 +85,11 @@ expectAssignable<Dispatcher>(new Dispatcher())
     expectAssignable<Dispatcher.PipelineHandlerData>(data)
     return new Readable()
   }))
+  expectAssignable<Duplex>(dispatcher.pipeline({ origin: '', path: '', method: 'GET', opaque: { example: '' } }, data => {
+    expectAssignable<Dispatcher.PipelineHandlerData<{ example: string }>>(data)
+    expectType<{ example: string }>(data.opaque)
+    return new Readable()
+  }))
 
   // stream
   expectAssignable<Promise<Dispatcher.StreamData>>(dispatcher.stream({ origin: '', path: '', method: 'GET', maxRedirections: 0 }, data => {
@@ -94,6 +100,10 @@ expectAssignable<Dispatcher>(new Dispatcher())
     expectAssignable<Dispatcher.StreamFactoryData>(data)
     return new Writable()
   }))
+  expectAssignable<Promise<Dispatcher.StreamData<{ example: string }>>>(dispatcher.stream({ origin: '', path: '', method: 'GET', opaque: { example: '' } }, data => {
+    expectType<{ example: string }>(data.opaque);
+    return new Writable();
+  }));
   expectAssignable<void>(dispatcher.stream(
     { origin: '', path: '', method: 'GET', reset: false },
     data => {
@@ -116,6 +126,18 @@ expectAssignable<Dispatcher>(new Dispatcher())
       expectAssignable<Dispatcher.StreamData>(data)
     }
   ))
+  expectAssignable<void>(dispatcher.stream(
+    { origin: new URL('http://localhost'), path: '', method: 'GET', opaque: { example: '' } },
+    data => {
+      expectAssignable<Dispatcher.StreamFactoryData<{ example: string }>>(data)
+      return new Writable()
+    },
+    (err, data) => {
+      expectAssignable<Error | null>(err)
+      expectAssignable<Dispatcher.StreamData<{ example: string }>>(data)
+      expectType<{ example: string }>(data.opaque)
+    }
+  ))
   expectAssignable<Promise<Dispatcher.StreamData>>(dispatcher.stream({ origin: '', path: '', method: 'GET', responseHeaders: 'raw' }, data => {
     expectAssignable<Dispatcher.StreamFactoryData>(data)
     return new Writable()
diff --git a/types/api.d.ts b/types/api.d.ts
index 400341dddc0..4fbebb6cd2e 100644
--- a/types/api.d.ts
+++ b/types/api.d.ts
@@ -11,30 +11,30 @@ export {
 }
 
 /** Performs an HTTP request. */
-declare function request(
+declare function request<TOpaque = null>(
   url: string | URL | UrlObject,
-  options?: { dispatcher?: Dispatcher } & Omit<Dispatcher.RequestOptions, 'origin' | 'path' | 'method'> & Partial<Pick<Dispatcher.RequestOptions, 'method'>>,
-): Promise<Dispatcher.ResponseData>;
+  options?: { dispatcher?: Dispatcher } & Omit<Dispatcher.RequestOptions<TOpaque>, 'origin' | 'path' | 'method'> & Partial<Pick<Dispatcher.RequestOptions, 'method'>>,
+): Promise<Dispatcher.ResponseData<TOpaque>>;
 
 /** A faster version of `request`. */
-declare function stream(
+declare function stream<TOpaque = null>(
   url: string | URL | UrlObject,
-  options: { dispatcher?: Dispatcher } & Omit<Dispatcher.RequestOptions, 'origin' | 'path'>,
-  factory: Dispatcher.StreamFactory
-): Promise<Dispatcher.StreamData>;
+  options: { dispatcher?: Dispatcher } & Omit<Dispatcher.RequestOptions<TOpaque>, 'origin' | 'path'>,
+  factory: Dispatcher.StreamFactory<TOpaque>
+): Promise<Dispatcher.StreamData<TOpaque>>;
 
 /** For easy use with `stream.pipeline`. */
-declare function pipeline(
+declare function pipeline<TOpaque = null>(
   url: string | URL | UrlObject,
-  options: { dispatcher?: Dispatcher } & Omit<Dispatcher.PipelineOptions, 'origin' | 'path'>,
-  handler: Dispatcher.PipelineHandler
+  options: { dispatcher?: Dispatcher } & Omit<Dispatcher.PipelineOptions<TOpaque>, 'origin' | 'path'>,
+  handler: Dispatcher.PipelineHandler<TOpaque>
 ): Duplex;
 
 /** Starts two-way communications with the requested resource. */
-declare function connect(
+declare function connect<TOpaque = null>(
   url: string | URL | UrlObject,
-  options?: { dispatcher?: Dispatcher } & Omit<Dispatcher.ConnectOptions, 'origin' | 'path'>
-): Promise<Dispatcher.ConnectData>;
+  options?: { dispatcher?: Dispatcher } & Omit<Dispatcher.ConnectOptions<TOpaque>, 'origin' | 'path'>
+): Promise<Dispatcher.ConnectData<TOpaque>>;
 
 /** Upgrade to a different protocol. */
 declare function upgrade(
diff --git a/types/dispatcher.d.ts b/types/dispatcher.d.ts
index 89350159eab..6f33adc4a1d 100644
--- a/types/dispatcher.d.ts
+++ b/types/dispatcher.d.ts
@@ -16,19 +16,19 @@ declare class Dispatcher extends EventEmitter {
   /** Dispatches a request. This API is expected to evolve through semver-major versions and is less stable than the preceding higher level APIs. It is primarily intended for library developers who implement higher level APIs on top of this. */
   dispatch(options: Dispatcher.DispatchOptions, handler: Dispatcher.DispatchHandlers): boolean;
   /** Starts two-way communications with the requested resource. */
-  connect(options: Dispatcher.ConnectOptions): Promise<Dispatcher.ConnectData>;
-  connect(options: Dispatcher.ConnectOptions, callback: (err: Error | null, data: Dispatcher.ConnectData) => void): void;
+  connect<TOpaque = null>(options: Dispatcher.ConnectOptions<TOpaque>): Promise<Dispatcher.ConnectData<TOpaque>>;
+  connect<TOpaque = null>(options: Dispatcher.ConnectOptions<TOpaque>, callback: (err: Error | null, data: Dispatcher.ConnectData<TOpaque>) => void): void;
   /** Compose a chain of dispatchers */
   compose(dispatchers: Dispatcher.DispatcherComposeInterceptor[]): Dispatcher.ComposedDispatcher;
   compose(...dispatchers: Dispatcher.DispatcherComposeInterceptor[]): Dispatcher.ComposedDispatcher;
   /** Performs an HTTP request. */
-  request(options: Dispatcher.RequestOptions): Promise<Dispatcher.ResponseData>;
-  request(options: Dispatcher.RequestOptions, callback: (err: Error | null, data: Dispatcher.ResponseData) => void): void;
+  request<TOpaque = null>(options: Dispatcher.RequestOptions<TOpaque>): Promise<Dispatcher.ResponseData<TOpaque>>;
+  request<TOpaque = null>(options: Dispatcher.RequestOptions<TOpaque>, callback: (err: Error | null, data: Dispatcher.ResponseData<TOpaque>) => void): void;
   /** For easy use with `stream.pipeline`. */
-  pipeline(options: Dispatcher.PipelineOptions, handler: Dispatcher.PipelineHandler): Duplex;
+  pipeline<TOpaque = null>(options: Dispatcher.PipelineOptions<TOpaque>, handler: Dispatcher.PipelineHandler<TOpaque>): Duplex;
   /** A faster version of `Dispatcher.request`. */
-  stream(options: Dispatcher.RequestOptions, factory: Dispatcher.StreamFactory): Promise<Dispatcher.StreamData>;
-  stream(options: Dispatcher.RequestOptions, factory: Dispatcher.StreamFactory, callback: (err: Error | null, data: Dispatcher.StreamData) => void): void;
+  stream<TOpaque = null>(options: Dispatcher.RequestOptions<TOpaque>, factory: Dispatcher.StreamFactory<TOpaque>): Promise<Dispatcher.StreamData<TOpaque>>;
+  stream<TOpaque = null>(options: Dispatcher.RequestOptions<TOpaque>, factory: Dispatcher.StreamFactory<TOpaque>, callback: (err: Error | null, data: Dispatcher.StreamData<TOpaque>) => void): void;
   /** Upgrade to a different protocol. */
   upgrade(options: Dispatcher.UpgradeOptions): Promise<Dispatcher.UpgradeData>;
   upgrade(options: Dispatcher.UpgradeOptions, callback: (err: Error | null, data: Dispatcher.UpgradeData) => void): void;
@@ -125,7 +125,7 @@ declare namespace Dispatcher {
     /** For H2, it appends the expect: 100-continue header, and halts the request body until a 100-continue is received from the remote server*/
     expectContinue?: boolean;
   }
-  export interface ConnectOptions {
+  export interface ConnectOptions<TOpaque = null> {
     origin: string | URL;
     path: string;
     /** Default: `null` */
@@ -133,7 +133,7 @@ declare namespace Dispatcher {
     /** Default: `null` */
     signal?: AbortSignal | EventEmitter | null;
     /** This argument parameter is passed through to `ConnectData` */
-    opaque?: unknown;
+    opaque?: TOpaque;
     /** Default: 0 */
     maxRedirections?: number;
     /** Default: false */
@@ -141,9 +141,9 @@ declare namespace Dispatcher {
     /** Default: `null` */
     responseHeaders?: 'raw' | null;
   }
-  export interface RequestOptions extends DispatchOptions {
+  export interface RequestOptions<TOpaque = null> extends DispatchOptions {
     /** Default: `null` */
-    opaque?: unknown;
+    opaque?: TOpaque;
     /** Default: `null` */
     signal?: AbortSignal | EventEmitter | null;
     /** Default: 0 */
@@ -157,7 +157,7 @@ declare namespace Dispatcher {
     /** Default: `64 KiB` */
     highWaterMark?: number;
   }
-  export interface PipelineOptions extends RequestOptions {
+  export interface PipelineOptions<TOpaque = null> extends RequestOptions<TOpaque> {
     /** `true` if the `handler` will return an object stream. Default: `false` */
     objectMode?: boolean;
   }
@@ -178,43 +178,43 @@ declare namespace Dispatcher {
     /** Default: `null` */
     responseHeaders?: 'raw' | null;
   }
-  export interface ConnectData {
+  export interface ConnectData<TOpaque = null> {
     statusCode: number;
     headers: IncomingHttpHeaders;
     socket: Duplex;
-    opaque: unknown;
+    opaque: TOpaque;
   }
-  export interface ResponseData {
+  export interface ResponseData<TOpaque = null> {
     statusCode: number;
     headers: IncomingHttpHeaders;
     body: BodyReadable & BodyMixin;
     trailers: Record<string, string>;
-    opaque: unknown;
+    opaque: TOpaque;
     context: object;
   }
-  export interface PipelineHandlerData {
+  export interface PipelineHandlerData<TOpaque = null> {
     statusCode: number;
     headers: IncomingHttpHeaders;
-    opaque: unknown;
+    opaque: TOpaque;
     body: BodyReadable;
     context: object;
   }
-  export interface StreamData {
-    opaque: unknown;
+  export interface StreamData<TOpaque = null> {
+    opaque: TOpaque;
     trailers: Record<string, string>;
   }
-  export interface UpgradeData {
+  export interface UpgradeData<TOpaque = null> {
     headers: IncomingHttpHeaders;
     socket: Duplex;
-    opaque: unknown;
+    opaque: TOpaque;
   }
-  export interface StreamFactoryData {
+  export interface StreamFactoryData<TOpaque = null> {
     statusCode: number;
     headers: IncomingHttpHeaders;
-    opaque: unknown;
+    opaque: TOpaque;
     context: object;
   }
-  export type StreamFactory = (data: StreamFactoryData) => Writable;
+  export type StreamFactory<TOpaque = null> = (data: StreamFactoryData<TOpaque>) => Writable;
   export interface DispatchHandlers {
     /** Invoked before request is dispatched on socket. May be invoked multiple times when a request is retried when the request at the head of the pipeline fails. */
     onConnect?(abort: (err?: Error) => void): void;
@@ -233,7 +233,7 @@ declare namespace Dispatcher {
     /** Invoked when a body chunk is sent to the server. May be invoked multiple times for chunked requests */
     onBodySent?(chunkSize: number, totalBytesSent: number): void;
   }
-  export type PipelineHandler = (data: PipelineHandlerData) => Readable;
+  export type PipelineHandler<TOpaque = null> = (data: PipelineHandlerData<TOpaque>) => Readable;
   export type HttpMethod = 'GET' | 'HEAD' | 'POST' | 'PUT' | 'DELETE' | 'CONNECT' | 'OPTIONS' | 'TRACE' | 'PATCH';
 
   /**