fix: added a option to choose between legacy and the new request/response interceptor ordering

* test: add request interceptor tests for legacy and ordered execution

* feat: add legacy interceptor request/response ordering option

---------

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

test/specs/interceptors.spec.js

@@ -91,6 +91,63 @@ describe('interceptors', function () {
     });
   });
 
+  it('should execute request interceptor in legacy order', function (done) {
+    let sequence = '';
+    axios.interceptors.request.use(function (config) {
+      sequence += '1';
+      return config;
+    });
+
+    axios.interceptors.request.use(function (config) {
+      sequence += '2';
+      return config;
+    });
+
+    axios.interceptors.request.use(function (config) {
+      sequence += '3';
+      return config;
+    });
+
+    axios({
+      url: '/foo',
+    });
+
+    getAjaxRequest().then(function (request) {
+      expect(sequence).toBe('321');
+      done();
+    });
+  });
+
+    it('should execute request interceptor in order', function (done) {
+    let sequence = '';
+    axios.interceptors.request.use(function (config) {
+      sequence += '1';
+      return config;
+    });
+
+    axios.interceptors.request.use(function (config) {
+      sequence += '2';
+      return config;
+    });
+
+    axios.interceptors.request.use(function (config) {
+      sequence += '3';
+      return config;
+    });
+
+    axios({
+      url: '/foo',
+      transitional: {
+        legacyInterceptorReqResOrdering: false
+      }
+    });
+
+    getAjaxRequest().then(function (request) {
+      expect(sequence).toBe('123');
+      done();
+    });
+  });
+
   it('runs the interceptor if runWhen function is provided and resolves to true', function (done) {
     function onGetCall(config) {
       return config.method === 'get';
@@ -343,7 +400,7 @@ describe('interceptors', function () {
 
       function fireRequestAndExpect(expectation) {
         let response;
-        axios('/foo').then(function(data) {
+        axios('/foo').then(function (data) {
           response = data;
         });
         getAjaxRequest().then(function (request) {
@@ -352,7 +409,7 @@ describe('interceptors', function () {
             responseText: 'OK'
           });
 
-          setTimeout(function() {
+          setTimeout(function () {
             expectation(response)
           }, 100);
         });
@@ -384,10 +441,10 @@ describe('interceptors', function () {
       });
 
       it('then only the last interceptor\'s result is returned', function (done) {
-        axios.interceptors.response.use(function() {
+        axios.interceptors.response.use(function () {
           return 'response 1';
         });
-        axios.interceptors.response.use(function() {
+        axios.interceptors.response.use(function () {
           return 'response 2';
         });
 
@@ -398,10 +455,10 @@ describe('interceptors', function () {
       });
 
       it('then every interceptor receives the result of it\'s predecessor', function (done) {
-        axios.interceptors.response.use(function() {
+        axios.interceptors.response.use(function () {
           return 'response 1';
         });
-        axios.interceptors.response.use(function(response) {
+        axios.interceptors.response.use(function (response) {
           return [response, 'response 2'];
         });
 
@@ -414,7 +471,7 @@ describe('interceptors', function () {
       describe('and when the fulfillment-interceptor throws', function () {
 
         function fireRequestCatchAndExpect(expectation) {
-          axios('/foo').catch(function(data) {
+          axios('/foo').catch(function (data) {
             // dont handle result
           });
           getAjaxRequest().then(function (request) {
@@ -423,14 +480,14 @@ describe('interceptors', function () {
               responseText: 'OK'
             });
 
-            setTimeout(function() {
+            setTimeout(function () {
               expectation()
             }, 100);
           });
         }
 
         it('then the following fulfillment-interceptor is not called', function (done) {
-          axios.interceptors.response.use(function() {
+          axios.interceptors.response.use(function () {
             throw Error('throwing interceptor');
           });
           const interceptor2 = jasmine.createSpy('interceptor2');
@@ -443,10 +500,10 @@ describe('interceptors', function () {
         });
 
         it('then the following rejection-interceptor is called', function (done) {
-          axios.interceptors.response.use(function() {
+          axios.interceptors.response.use(function () {
             throw Error('throwing interceptor');
           });
-          const unusedFulfillInterceptor = function() {};
+          const unusedFulfillInterceptor = function () { };
           const rejectIntercept = jasmine.createSpy('rejectIntercept');
           axios.interceptors.response.use(unusedFulfillInterceptor, rejectIntercept);
 
@@ -457,12 +514,12 @@ describe('interceptors', function () {
         });
 
         it('once caught, another following fulfill-interceptor is called again (just like in a promise chain)', function (done) {
-          axios.interceptors.response.use(function() {
+          axios.interceptors.response.use(function () {
             throw Error('throwing interceptor');
           });
 
-          const unusedFulfillInterceptor = function() {};
-          const catchingThrowingInterceptor = function() {};
+          const unusedFulfillInterceptor = function () { };
+          const catchingThrowingInterceptor = function () { };
           axios.interceptors.response.use(unusedFulfillInterceptor, catchingThrowingInterceptor);
 
           const interceptor3 = jasmine.createSpy('interceptor3');