diff --git a/src/middleware.browser.ts b/src/middleware.browser.ts
index e394746f..e0126dc0 100644
--- a/src/middleware.browser.ts
+++ b/src/middleware.browser.ts
@@ -15,7 +15,6 @@ export * from './middleware/promise'
 export * from './middleware/proxy'
 export * from './middleware/retry/browser-retry'
 export * from './middleware/urlEncoded'
-export type * from './types'
 
 import {agent} from './middleware/agent/browser-agent'
 import {buildKeepAlive} from './middleware/keepAlive'
diff --git a/src/middleware.ts b/src/middleware.ts
index 03de2981..cb0732ec 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -15,7 +15,6 @@ export * from './middleware/promise'
 export * from './middleware/proxy'
 export * from './middleware/retry/node-retry'
 export * from './middleware/urlEncoded'
-export type * from './types'
 
 import {agent} from './middleware/agent/node-agent'
 import {buildKeepAlive} from './middleware/keepAlive'
diff --git a/src/middleware/base.ts b/src/middleware/base.ts
index 1328dda3..10f0e2de 100644
--- a/src/middleware/base.ts
+++ b/src/middleware/base.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 const leadingSlash = /^\//
 const trailingSlash = /\/$/
diff --git a/src/middleware/debug.ts b/src/middleware/debug.ts
index e8374529..de042398 100644
--- a/src/middleware/debug.ts
+++ b/src/middleware/debug.ts
@@ -1,6 +1,5 @@
 import debugIt from 'debug'
-
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 const SENSITIVE_HEADERS = ['cookie', 'authorization']
 
diff --git a/src/middleware/defaultOptionsProcessor.ts b/src/middleware/defaultOptionsProcessor.ts
index 4295d9a1..eb6bdfb1 100644
--- a/src/middleware/defaultOptionsProcessor.ts
+++ b/src/middleware/defaultOptionsProcessor.ts
@@ -1,4 +1,4 @@
-import type {MiddlewareHooks, RequestOptions} from '../types'
+import type {MiddlewareHooks, RequestOptions} from 'get-it'
 
 const isReactNative = typeof navigator === 'undefined' ? false : navigator.product === 'ReactNative'
 
diff --git a/src/middleware/defaultOptionsValidator.ts b/src/middleware/defaultOptionsValidator.ts
index 94581b0b..2841db7d 100644
--- a/src/middleware/defaultOptionsValidator.ts
+++ b/src/middleware/defaultOptionsValidator.ts
@@ -1,4 +1,4 @@
-import type {MiddlewareHooks} from '../types'
+import type {MiddlewareHooks} from 'get-it'
 
 const validUrl = /^https?:\/\//i
 
diff --git a/src/middleware/headers.ts b/src/middleware/headers.ts
index effeafbc..f89e7245 100644
--- a/src/middleware/headers.ts
+++ b/src/middleware/headers.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 /** @public */
 export function headers(_headers: any, opts: any = {}) {
diff --git a/src/middleware/httpErrors.ts b/src/middleware/httpErrors.ts
index e7b5a9db..2d29d2e3 100644
--- a/src/middleware/httpErrors.ts
+++ b/src/middleware/httpErrors.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 class HttpError extends Error {
   response: any
diff --git a/src/middleware/injectResponse.ts b/src/middleware/injectResponse.ts
index afbd4cc9..b6b132ba 100644
--- a/src/middleware/injectResponse.ts
+++ b/src/middleware/injectResponse.ts
@@ -1,4 +1,4 @@
-import type {Middleware, MiddlewareHooks, MiddlewareResponse} from '../types'
+import type {Middleware, MiddlewareHooks, MiddlewareResponse} from 'get-it'
 
 /** @public */
 export function injectResponse(
diff --git a/src/middleware/jsonRequest.ts b/src/middleware/jsonRequest.ts
index cff76863..beaadffe 100644
--- a/src/middleware/jsonRequest.ts
+++ b/src/middleware/jsonRequest.ts
@@ -1,4 +1,5 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
+
 import {isBuffer} from '../util/isBuffer'
 import {isPlainObject} from '../util/isPlainObject'
 
diff --git a/src/middleware/jsonResponse.ts b/src/middleware/jsonResponse.ts
index 957196b5..96b8ffd2 100644
--- a/src/middleware/jsonResponse.ts
+++ b/src/middleware/jsonResponse.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 /** @public */
 export function jsonResponse(opts?: any) {
diff --git a/src/middleware/mtls.ts b/src/middleware/mtls.ts
index 7a226211..ac778206 100644
--- a/src/middleware/mtls.ts
+++ b/src/middleware/mtls.ts
@@ -1,4 +1,5 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
+
 import {isBrowserOptions} from '../util/isBrowserOptions'
 
 /** @public */
diff --git a/src/middleware/observable.ts b/src/middleware/observable.ts
index bbcf0b74..ac2f41ea 100644
--- a/src/middleware/observable.ts
+++ b/src/middleware/observable.ts
@@ -1,4 +1,5 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
+
 import global from '../util/global'
 
 /** @public */
diff --git a/src/middleware/progress/browser-progress.ts b/src/middleware/progress/browser-progress.ts
index 29f50eb7..50fe2ee9 100644
--- a/src/middleware/progress/browser-progress.ts
+++ b/src/middleware/progress/browser-progress.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../../types'
+import type {Middleware} from 'get-it'
 
 /** @public */
 export function progress() {
diff --git a/src/middleware/progress/node-progress.ts b/src/middleware/progress/node-progress.ts
index e9028475..4c73c446 100644
--- a/src/middleware/progress/node-progress.ts
+++ b/src/middleware/progress/node-progress.ts
@@ -1,7 +1,6 @@
+import type {Middleware} from 'get-it'
 import progressStream from 'progress-stream'
 
-import type {Middleware} from '../../types'
-
 function normalizer(stage: 'download' | 'upload') {
   return (prog: any) => ({
     stage,
diff --git a/src/middleware/promise.ts b/src/middleware/promise.ts
index 82f47de8..607628f5 100644
--- a/src/middleware/promise.ts
+++ b/src/middleware/promise.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 /** @public */
 export const promise = (
diff --git a/src/middleware/proxy.ts b/src/middleware/proxy.ts
index 0d8b5ced..27ce63f1 100644
--- a/src/middleware/proxy.ts
+++ b/src/middleware/proxy.ts
@@ -1,4 +1,4 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
 
 /** @public */
 export function proxy(_proxy: any) {
diff --git a/src/middleware/retry/browser-retry.ts b/src/middleware/retry/browser-retry.ts
index 854d0d48..a2d705a9 100644
--- a/src/middleware/retry/browser-retry.ts
+++ b/src/middleware/retry/browser-retry.ts
@@ -1,4 +1,5 @@
-import type {RetryOptions} from '../../types'
+import type {RetryOptions} from 'get-it'
+
 import defaultShouldRetry from '../../util/browser-shouldRetry'
 import sharedRetry from './shared-retry'
 
diff --git a/src/middleware/retry/node-retry.ts b/src/middleware/retry/node-retry.ts
index c6515b7c..cd39ae4a 100644
--- a/src/middleware/retry/node-retry.ts
+++ b/src/middleware/retry/node-retry.ts
@@ -1,4 +1,5 @@
-import type {RetryOptions} from '../../types'
+import type {RetryOptions} from 'get-it'
+
 import defaultShouldRetry from '../../util/node-shouldRetry'
 import sharedRetry from './shared-retry'
 
diff --git a/src/middleware/retry/shared-retry.ts b/src/middleware/retry/shared-retry.ts
index b9118f43..963b1022 100644
--- a/src/middleware/retry/shared-retry.ts
+++ b/src/middleware/retry/shared-retry.ts
@@ -1,4 +1,4 @@
-import type {Middleware, RetryOptions} from '../../types'
+import type {Middleware, RetryOptions} from 'get-it'
 
 const isStream = (stream: any) =>
   stream !== null && typeof stream === 'object' && typeof stream.pipe === 'function'
@@ -13,6 +13,7 @@ export default (opts: RetryOptions) => {
     onError: (err, context) => {
       const options = context.options
       const max = options.maxRetries || maxRetries
+      const delay = options.retryDelay || retryDelay
       const shouldRetry = options.shouldRetry || allowRetry
       const attemptNumber = options.attemptNumber || 0
 
@@ -32,7 +33,7 @@ export default (opts: RetryOptions) => {
       })
 
       // Wait a given amount of time before doing the request again
-      setTimeout(() => context.channels.request.publish(newContext), retryDelay(attemptNumber))
+      setTimeout(() => context.channels.request.publish(newContext), delay(attemptNumber))
 
       // Signal that we've handled the error and that it should not propagate further
       return null
diff --git a/src/middleware/urlEncoded.ts b/src/middleware/urlEncoded.ts
index c9308547..00e8948d 100644
--- a/src/middleware/urlEncoded.ts
+++ b/src/middleware/urlEncoded.ts
@@ -1,4 +1,5 @@
-import type {Middleware} from '../types'
+import type {Middleware} from 'get-it'
+
 import {isBuffer} from '../util/isBuffer'
 import {isPlainObject} from '../util/isPlainObject'
 
diff --git a/src/request/browser-request.ts b/src/request/browser-request.ts
index 74956431..f9ff713f 100644
--- a/src/request/browser-request.ts
+++ b/src/request/browser-request.ts
@@ -1,6 +1,6 @@
+import type {HttpRequest, MiddlewareResponse, RequestAdapter, RequestOptions} from 'get-it'
 import parseHeaders from 'parse-headers'
 
-import type {HttpRequest, MiddlewareResponse, RequestAdapter, RequestOptions} from '../types'
 import {FetchXhr} from './browser/fetchXhr'
 
 /**
diff --git a/src/request/node-request.ts b/src/request/node-request.ts
index f0100e40..804a61e5 100644
--- a/src/request/node-request.ts
+++ b/src/request/node-request.ts
@@ -1,5 +1,11 @@
 import decompressResponse from 'decompress-response'
 import follow, {type FollowResponse, type RedirectableRequest} from 'follow-redirects'
+import type {
+  FinalizeNodeOptionsPayload,
+  HttpRequest,
+  MiddlewareResponse,
+  RequestAdapter,
+} from 'get-it'
 import http from 'http'
 import https from 'https'
 import toStream from 'into-stream'
@@ -8,12 +14,6 @@ import progressStream from 'progress-stream'
 import qs from 'querystring'
 import url from 'url'
 
-import type {
-  FinalizeNodeOptionsPayload,
-  HttpRequest,
-  MiddlewareResponse,
-  RequestAdapter,
-} from '../types'
 import {lowerCaseHeaders} from '../util/lowerCaseHeaders'
 import {getProxyOptions, rewriteUriForProxy} from './node/proxy'
 import {concat} from './node/simpleConcat'
diff --git a/src/types.ts b/src/types.ts
index 95b0cbb3..73fa4739 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -12,6 +12,7 @@ export interface RequestOptions {
   headers?: any
   maxRedirects?: number
   maxRetries?: number
+  retryDelay?: (attemptNumber: number) => number
   method?: string
   proxy?: any
   query?: any
diff --git a/src/util/isBrowserOptions.ts b/src/util/isBrowserOptions.ts
index 6d64fe2f..1d1d6491 100644
--- a/src/util/isBrowserOptions.ts
+++ b/src/util/isBrowserOptions.ts
@@ -1,4 +1,4 @@
-import type {RequestOptions} from '../types'
+import type {RequestOptions} from 'get-it'
 
 export function isBrowserOptions(options: unknown): options is RequestOptions {
   return typeof options === 'object' && options !== null && !('protocol' in options)
diff --git a/src/util/middlewareReducer.ts b/src/util/middlewareReducer.ts
index f71c976e..fad617af 100644
--- a/src/util/middlewareReducer.ts
+++ b/src/util/middlewareReducer.ts
@@ -1,4 +1,4 @@
-import type {ApplyMiddleware, MiddlewareReducer} from '../types'
+import type {ApplyMiddleware, MiddlewareReducer} from 'get-it'
 
 export const middlewareReducer = (middleware: MiddlewareReducer) =>
   function applyMiddleware(hook, defaultValue, ...args) {
diff --git a/src/util/pubsub.ts b/src/util/pubsub.ts
index 5d704017..0fa26e19 100644
--- a/src/util/pubsub.ts
+++ b/src/util/pubsub.ts
@@ -1,6 +1,6 @@
 // Code borrowed from https://github.com/bjoerge/nano-pubsub
 
-import type {PubSub, Subscriber} from '../types'
+import type {PubSub, Subscriber} from 'get-it'
 
 export function createPubSub<Message = void>(): PubSub<Message> {
   const subscribers: {[id: string]: Subscriber<Message>} = Object.create(null)