[fetch-mock] Add Mock Configuration Options

types/fetch-mock/fetch-mock-tests.ts

@@ -61,6 +61,7 @@ fetchMock.patch("http://test.com", 200);
 fetchMock.patchOnce("http://test.com", 200);
 
 fetchMock.get("http://test.com", 200, {method: "GET"});
+fetchMock.get("http://test.com", 200, {method: "GET", overwriteRoutes: true});
 fetchMock.post("http://test.com", 200, {method: "POST"});
 fetchMock.put("http://test.com", 200, {method: "PUT"});
 fetchMock.delete("http://test.com", 200, {method: "DELETE"});

types/fetch-mock/index.d.ts

@@ -5,6 +5,7 @@
 //                 Risto Keravuori <https://github.com/merrywhether>
 //                 Chris Sinclair <https://github.com/chrissinclair>
 //                 Matt Tennison <https://github.com/matttennison>
+//                 Quentin Bouygues <https://github.com/quentinbouygues>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.2
 
@@ -120,6 +121,12 @@ declare namespace fetchMock {
          * as specified above
          */
         matcher?: MockMatcher;
+        /**
+         * This option allows for existing routes in a mock to be overwritten.
+         * It’s also possible to define multiple routes with ‘the same’ matcher.
+         * Default behaviour is to error
+         */
+        overwriteRoutes?: boolean;
         /**
          * as specified above
          */