[CHORE] najax deprecation when ember-fetch is also installed

packages/adapter/addon/rest.js

@@ -5,12 +5,13 @@
 */
 
 import { getOwner } from '@ember/application';
-import { warn } from '@ember/debug';
+import { deprecate, warn } from '@ember/debug';
 import { computed, get } from '@ember/object';
 import { assign } from '@ember/polyfills';
 import { run } from '@ember/runloop';
 import { DEBUG } from '@glimmer/env';
 
+import { has } from 'require';
 import { Promise } from 'rsvp';
 
 import Adapter, { BuildURLMixin } from '@ember-data/adapter';
@@ -24,11 +25,11 @@ import AdapterError, {
   TimeoutError,
   UnauthorizedError,
 } from '@ember-data/adapter/error';
+import { DEPRECATE_NAJAX } from '@ember-data/private-build-infra/deprecations';
 
 import { determineBodyPromise, fetch, parseResponseHeaders, serializeIntoHash, serializeQueryParams } from './-private';
 
 const hasJQuery = typeof jQuery !== 'undefined';
-const hasNajax = typeof najax !== 'undefined';
 
 /**
   The REST adapter allows your store to communicate with an HTTP server by
@@ -290,7 +291,7 @@ const hasNajax = typeof najax !== 'undefined';
   @extends Adapter
   @uses BuildURLMixin
 */
-const RESTAdapter = Adapter.extend(BuildURLMixin, {
+let RESTAdapter = Adapter.extend(BuildURLMixin, {
   defaultSerializer: '-rest',
 
   _defaultContentType: 'application/json; charset=utf-8',
@@ -309,18 +310,47 @@ const RESTAdapter = Adapter.extend(BuildURLMixin, {
     },
   }),
 
-  useFetch: computed(function() {
-    let ENV = getOwner(this).resolveRegistration('config:environment');
-    // TODO: https://github.com/emberjs/data/issues/6093
-    let jQueryIntegrationDisabled = ENV && ENV.EmberENV && ENV.EmberENV._JQUERY_INTEGRATION === false;
-
-    if (jQueryIntegrationDisabled) {
-      return true;
-    } else if (hasNajax || hasJQuery) {
-      return false;
-    } else {
-      return true;
-    }
+  useFetch: computed({
+    get() {
+      if (this._useFetch !== undefined) {
+        return this._useFetch;
+      }
+      let ENV = getOwner(this).resolveRegistration('config:environment');
+      // TODO: https://github.com/emberjs/data/issues/6093
+      let jQueryIntegrationDisabled = ENV && ENV.EmberENV && ENV.EmberENV._JQUERY_INTEGRATION === false;
+
+      if (jQueryIntegrationDisabled) {
+        return (this._useFetch = true);
+      } else if (DEPRECATE_NAJAX && typeof najax !== 'undefined') {
+        if (has('fetch')) {
+          deprecate(
+            'You have ember-fetch and jquery installed. To use ember-fetch instead of najax, set `useFetch: true` in your adapter.  In 4.0, ember-data will default to ember-fetch instead of najax when both ember-fetch and jquery are installed in FastBoot.',
+            false,
+            {
+              id: 'ember-data:najax-fallback',
+              until: '4.0',
+            }
+          );
+        } else {
+          deprecate(
+            'In 4.0, ember-data will default to ember-fetch instead of najax in FastBoot.  It is recommended that you install ember-fetch or similar fetch polyfill in FastBoot.',
+            false,
+            {
+              id: 'ember-data:najax-fallback',
+              until: '4.0',
+            }
+          );
+        }
+        return (this._useFetch = false);
+      } else if (hasJQuery) {
+        return (this._useFetch = false);
+      } else {
+        return (this._useFetch = true);
+      }
+    },
+    set(key, value) {
+      return (this._useFetch = value);
+    },
   }),
 
   /**
@@ -991,15 +1021,14 @@ const RESTAdapter = Adapter.extend(BuildURLMixin, {
   */
   ajax(url, type, options) {
     let adapter = this;
-    let useFetch = get(this, 'useFetch');
 
     let requestData = {
       url: url,
       method: type,
     };
     let hash = adapter.ajaxOptions(url, type, options);
 
-    if (useFetch) {
+    if (this.useFetch) {
       let _response;
       return this._fetchRequest(hash)
         .then(response => {
@@ -1039,21 +1068,6 @@ const RESTAdapter = Adapter.extend(BuildURLMixin, {
     jQuery.ajax(options);
   },
 
-  /**
-    @method _najaxRequest
-    @private
-    @param {Object} options jQuery ajax options to be used for the najax request
-  */
-  _najaxRequest(options) {
-    if (hasNajax) {
-      najax(options);
-    } else {
-      throw new Error(
-        'najax does not seem to be defined in your app. Did you override it via `addOrOverrideSandboxGlobals` in the fastboot server?'
-      );
-    }
-  },
-
   _fetchRequest(options) {
     let fetchFunction = fetch();
 
@@ -1067,9 +1081,9 @@ const RESTAdapter = Adapter.extend(BuildURLMixin, {
   },
 
   _ajax(options) {
-    if (get(this, 'useFetch')) {
+    if (this.useFetch) {
       this._fetchRequest(options);
-    } else if (get(this, 'fastboot.isFastBoot')) {
+    } else if (DEPRECATE_NAJAX && get(this, 'fastboot.isFastBoot')) {
       this._najaxRequest(options);
     } else {
       this._ajaxRequest(options);
@@ -1103,7 +1117,7 @@ const RESTAdapter = Adapter.extend(BuildURLMixin, {
 
     let contentType = options.contentType || this._defaultContentType;
 
-    if (get(this, 'useFetch')) {
+    if (this.useFetch) {
       if (options.data && options.type !== 'GET') {
         if (!options.headers['Content-Type'] && !options.headers['content-type']) {
           options.headers['content-type'] = contentType;
@@ -1414,4 +1428,23 @@ function ajaxOptions(options, adapter) {
   return options;
 }
 
+if (DEPRECATE_NAJAX) {
+  RESTAdapter = RESTAdapter.extend({
+    /**
+      @method _najaxRequest
+      @private
+      @param {Object} options jQuery ajax options to be used for the najax request
+    */
+    _najaxRequest(options) {
+      if (typeof najax !== 'undefined') {
+        najax(options);
+      } else {
+        throw new Error(
+          'najax does not seem to be defined in your app. Did you override it via `addOrOverrideSandboxGlobals` in the fastboot server?'
+        );
+      }
+    },
+  });
+}
+
 export default RESTAdapter;

packages/private-build-infra/addon/current-deprecations.ts

@@ -1,7 +1,7 @@
 /**
  * ## Deprecations
  *
- * EmberData allows users to remove code that exists to support deprecated
+ * EmberData allows users to opt-in and remove code that exists to support deprecated
  * behaviors.
  *
  * If your app has resolved all deprecations present in a given version,
@@ -51,4 +51,5 @@ export default {
   DEPRECATE_SERIALIZER_QUERY_RECORD_ARRAY_RESPONSE: '3.4',
   DEPRECATE_BELONGS_TO_REFERENCE_PUSH: '3.16',
   DEPRECATE_REFERENCE_INTERNAL_MODEL: '3.19',
+  DEPRECATE_NAJAX: '3.22',
 };

packages/private-build-infra/addon/deprecations.ts

@@ -24,3 +24,4 @@ export const DEPRECATE_MISMATCHED_INVERSE_RELATIONSHIP_DATA = deprecationState(
 );
 export const DEPRECATE_BELONGS_TO_REFERENCE_PUSH = deprecationState('DEPRECATE_BELONGS_TO_REFERENCE_PUSH');
 export const DEPRECATE_REFERENCE_INTERNAL_MODEL = deprecationState('DEPRECATE_REFERENCE_INTERNAL_MODEL');
+export const DEPRECATE_NAJAX = deprecationState('DEPRECATE_NAJAX');