Added generic AxiosAbortSignal TS interface to avoid importing AbortController polyfill (#4229)

* Added generic `AxiosAbortSignal` TS interface to avoid importing AbortController polyfill;

* Renamed `AxiosAbortSignal` to `GenericAbortSignal` to use the same naming style as `GenericFormData`;

* Added TS test for `GenericAbortSignal` interface;

Co-authored-by: Jay <jasonsaayman@gmail.com>

index.d.ts

@@ -72,6 +72,13 @@ export interface TransitionalOptions {
   clarifyTimeoutError?: boolean;
 }
 
+export interface GenericAbortSignal {
+  aborted: boolean;
+  onabort: ((...args: any) => any) | null;
+  addEventListener: (...args: any) => any;
+  removeEventListener: (...args: any) => any;
+}
+
 export interface AxiosRequestConfig<D = any> {
   url?: string;
   method?: Method | string;
@@ -105,7 +112,7 @@ export interface AxiosRequestConfig<D = any> {
   cancelToken?: CancelToken;
   decompress?: boolean;
   transitional?: TransitionalOptions;
-  signal?: AbortSignal;
+  signal?: GenericAbortSignal;
   insecureHTTPParser?: boolean;
   env?: {
     FormData?: new (...args: any[]) => object;

test/typescript/axios.ts

@@ -375,3 +375,7 @@ axios.get('/user')
 // FormData
 
 axios.toFormData({x: 1}, new FormData());
+
+// AbortSignal
+
+axios.get('/user', {signal: new AbortController().signal});