fix: nodejs support by default

README.md

@@ -96,13 +96,13 @@ The Unleash SDK takes the following options:
 | url               | yes | n/a | The Unleash Proxy URL to connect to. E.g.: `https://examples.com/proxy`                                                                         |
 | clientKey         | yes | n/a | The Unleash Proxy Secret to be used                                                                                                             | 
 | appName           | yes | n/a | The name of the application using this SDK. Will be used as part of the metrics sent to Unleash Proxy. Will also be part of the Unleash Context. | 
-| refreshInterval   | no | 30 | How often, in seconds, the SDK should check for updated toggle configuration. If set to 0 will disable checking for updates                 |
-| disableRefresh    | no | false | If set to true, the client will not check for updated toggle configuration                                                                |
-| metricsInterval   | no | 60 | How often, in seconds, the SDK should send usage metrics back to Unleash Proxy                                                              | 
-| disableMetrics    | no | false | Set this option to `true` if you want to disable usage metrics                                                                           |
-| storageProvider   | no | `LocalStorageProvider` | Allows you to inject a custom storeProvider                                                                              |
-| environment       | no | 'default' | Identify the current environment. Will be part of the Unleash Context                                                                   | 
-| fetch             | no | window.fetch | Allows you to override the fetch implementation to use. Useful in Node.js environments where you can inject `node-fetch`                    | 
+| refreshInterval   | no | `30` | How often, in seconds, the SDK should check for updated toggle configuration. If set to 0 will disable checking for updates                 |
+| disableRefresh    | no | `false` | If set to true, the client will not check for updated toggle configuration                                                                |
+| metricsInterval   | no | `60` | How often, in seconds, the SDK should send usage metrics back to Unleash Proxy                                                              | 
+| disableMetrics    | no | `false` | Set this option to `true` if you want to disable usage metrics                                                                           |
+| storageProvider   | no | `LocalStorageProvider` in browser, `InMemoryStorageProvider` otherwise | Allows you to inject a custom storeProvider                                                                              |
+| environment       | no | `default` | Identify the current environment. Will be part of the Unleash Context                                                                   | 
+| fetch             | no | `window.fetch` or global `fetch` | Allows you to override the fetch implementation to use. Useful in Node.js environments where you can inject `node-fetch`                    | 
 | bootstrap         | no | `[]` | Allows you to bootstrap the cached feature toggle configuration.                                                                               | 
 | bootstrapOverride | no| `true` | Should the bootstrap automatically override cached data in the local-storage. Will only be used if bootstrap is not an empty array.     | 
 | headerName        | no| `Authorization` | Provides possiblity to specify custom header that is passed to Unleash / Unleash Proxy with the `clientKey` | 

src/index.ts

@@ -76,7 +76,7 @@ const storeKey = 'repo';
 
 export const resolveFetch = () => {
     try {
-        if ('fetch' in window) {
+        if (typeof window !== 'undefined' && 'fetch' in window) {
             return fetch.bind(window);
         } else if ('fetch' in globalThis) {
             return fetch.bind(globalThis);
@@ -146,7 +146,11 @@ export class UnleashClient extends TinyEmitter {
         this.clientKey = clientKey;
         this.headerName = headerName;
         this.customHeaders = customHeaders;
-        this.storage = storageProvider || new LocalStorageProvider();
+        this.storage =
+            storageProvider ||
+            (typeof window !== 'undefined'
+                ? new LocalStorageProvider()
+                : new InMemoryStorageProvider());
         this.refreshInterval = disableRefresh ? 0 : refreshInterval * 1000;
         this.context = { appName, environment, ...context };
         this.usePOSTrequests = usePOSTrequests;

src/storage-provider-inmemory.test.ts

@@ -1,6 +1,6 @@
 import InMemoryStorageProvider from './storage-provider-inmemory';
 
-describe('ImMemoryStorageProvider', () => {
+describe('InMemoryStorageProvider', () => {
     it('should store and retrieve arbitrary values by key', async () => {
         const store = new InMemoryStorageProvider();
 

src/storage-provider-inmemory.ts

@@ -1,6 +1,6 @@
 import type IStorageProvider from './storage-provider';
 
-export default class ImMemoryStorageProvider implements IStorageProvider {
+export default class InMemoryStorageProvider implements IStorageProvider {
     private store = new Map();
 
     public async save(name: string, data: any) {