From 64906bd8866fd86369133cee461f75b8353176ba Mon Sep 17 00:00:00 2001
From: Stephen Jennings <stephen.g.jennings@gmail.com>
Date: Mon, 26 Sep 2022 12:11:29 -0700
Subject: [PATCH] require interceptors to return values (#4874)

Fixes #4873

Co-authored-by: Jay <jasonsaayman@gmail.com>
---
 index.d.ts               |  2 +-
 test/typescript/axios.ts | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/index.d.ts b/index.d.ts
index dc03f4f..4f398be 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -343,7 +343,7 @@ export interface AxiosInterceptorOptions {
 }
 
 export interface AxiosInterceptorManager<V> {
-  use<T = V>(onFulfilled?: (value: V) => T | Promise<T>, onRejected?: (error: any) => any, options?: AxiosInterceptorOptions): number;
+  use(onFulfilled?: (value: V) => V | Promise<V>, onRejected?: (error: any) => any, options?: AxiosInterceptorOptions): number;
   eject(id: number): void;
 }
 
diff --git a/test/typescript/axios.ts b/test/typescript/axios.ts
index 4ff50cb..eddf2bc 100644
--- a/test/typescript/axios.ts
+++ b/test/typescript/axios.ts
@@ -300,6 +300,19 @@ axios.interceptors.response.use(
   (error: any) => Promise.reject(error)
 );
 
+const voidRequestInterceptorId = axios.interceptors.request.use(
+  // @ts-expect-error -- Must return an AxiosRequestConfig (or throw)
+  (_response) => {},
+  (error: any) => Promise.reject(error)
+);
+const voidResponseInterceptorId = axios.interceptors.response.use(
+  // @ts-expect-error -- Must return an AxiosResponse (or throw)
+  (_response) => {},
+  (error: any) => Promise.reject(error)
+);
+axios.interceptors.request.eject(voidRequestInterceptorId);
+axios.interceptors.response.eject(voidResponseInterceptorId);
+
 axios.interceptors.response.use((response: AxiosResponse) => response);
 axios.interceptors.response.use((response: AxiosResponse) => Promise.resolve(response));