Bump deps (incl. isomorphic-fetch replacement) (#2614)

* Bump deps (incl. isomorphic-fetch replacement)

* Bump ts

packages/rpc-provider/src/http/index.ts

@@ -4,8 +4,7 @@
 
 import { ProviderInterface, ProviderInterfaceCallback, ProviderInterfaceEmitted, ProviderInterfaceEmitCb } from '../types';
 
-import './polyfill';
-
+import fetch from 'cross-fetch';
 import { assert, logger } from '@polkadot/util';
 
 import Coder from '../coder';

packages/rpc-provider/src/http/polyfill.spec.ts

@@ -1,37 +0,0 @@
-// Copyright 2017-2020 @polkadot/rpc-provider authors & contributors
-// This software may be modified and distributed under the terms
-// of the Apache-2.0 license. See the LICENSE file for details.
-
-import { Global } from './../mock/types';
-
-declare const global: Global;
-
-describe('http/polyfill', (): void => {
-  let origFetch: any;
-
-  beforeEach((): void => {
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-    origFetch = global.fetch;
-  });
-
-  afterEach((): void => {
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
-    global.fetch = origFetch;
-  });
-
-  it('polyfills with no exceptions (without fetch)', (): void => {
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
-    (global as any).fetch = undefined;
-    require('./polyfill');
-
-    expect(global.fetch).toBeDefined();
-  });
-
-  it('polyfills with no exceptions (with fetch)', (): void => {
-    // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
-    (global as any).fetch = (): boolean => true;
-    require('./polyfill');
-
-    expect(global.fetch).toBeDefined();
-  });
-});

packages/rpc-provider/src/http/polyfill.ts

@@ -1,7 +0,0 @@
-// Copyright 2017-2020 @polkadot/rpc-provider authors & contributors
-// This software may be modified and distributed under the terms
-// of the Apache-2.0 license. See the LICENSE file for details.
-
-if (typeof fetch === 'undefined') {
-  require('isomorphic-fetch');
-}