moved fetch to dynamic import

Author: mohammedmanssour

package.json

@@ -21,6 +21,7 @@
   "devDependencies": {
     "@ef-carbon/fetch": "^2.1.3",
     "@types/node": "^10.12.18",
+    "@types/node-fetch": "^2.1.4",
     "ava": "^1.0.1",
     "cross-env": "^5.2.0",
     "node-fetch": "^2.3.0",

src/fetch.ts

@@ -0,0 +1,16 @@
+import FetchOptions from './lib/FetchOptions';
+
+const callFetch = (url: string, options: Partial<FetchOptions>) => {
+  //@ts-ignore
+  if (typeof fetch === 'undefined') {
+    return import('node-fetch').then(fetch => {
+      //@ts-ignore
+      return fetch(url, options);
+    });
+  }
+
+  //@ts-ignore
+  return fetch(url, options);
+};
+
+export default callFetch;

src/lib/FetchRequest.ts

@@ -1,11 +1,8 @@
 import FetchOptions from './FetchOptions';
-import { skip, isNode } from '../Utils';
+import { skip } from '../Utils';
 import Fetch from '.';
 import { QueryObject } from '../types';
-
-if (typeof fetch == 'undefined') {
-  var fetch = require('node-fetch');
-}
+import fetch from '../fetch';
 
 export default class FetchRequest {
   options: FetchOptions = new FetchOptions();

tsconfig.json

@@ -9,7 +9,6 @@
 		"module": "CommonJS",
   	},
   	"exclude": [
-		"node_modules",
 		"exampleApp"
 	]
 }