Adding better 'responseType' and 'method' type definitions by using a string...

Adding better 'responseType' and 'method' type definitions by using a string literal union type of possible values (#1148)

index.d.ts

@@ -22,7 +22,7 @@ export interface AxiosProxyConfig {
 
 export interface AxiosRequestConfig {
   url?: string;
-  method?: string;
+  method?: 'get' | 'delete' | 'head' | 'options' | 'post' | 'put' | 'patch';
   baseURL?: string;
   transformRequest?: AxiosTransformer | AxiosTransformer[];
   transformResponse?: AxiosTransformer | AxiosTransformer[];
@@ -34,7 +34,7 @@ export interface AxiosRequestConfig {
   withCredentials?: boolean;
   adapter?: AxiosAdapter;
   auth?: AxiosBasicCredentials;
-  responseType?: string;
+  responseType?: 'arraybuffer' | 'blob' | 'document' | 'json' | 'text' | 'stream';
   xsrfCookieName?: string;
   xsrfHeaderName?: string;
   onUploadProgress?: (progressEvent: any) => void;