fix TokenFileWebIdentityCredentials typing (#4388)

Author: ChenNima

.changes/next-release/bugfix-Typing-102b0d52.json

@@ -0,0 +1,5 @@
+{
+  "type": "bugfix",
+  "category": "Typing",
+  "description": "Align the typing for constructor param of TokenFileWebIdentityCredentials with STS client"
+}

lib/credentials/token_file_web_identity_credentials.d.ts

@@ -1,12 +1,12 @@
 import {Credentials} from '../credentials';
 import {AWSError} from '../error';
-import {ConfigurationOptions} from '../config-base';
+import {ClientConfiguration} from '../../clients/sts';
 export class TokenFileWebIdentityCredentials extends Credentials {
     /**
      * Creates a new credentials object with optional configuraion.
      * @param {Object} clientConfig - a map of configuration options to pass to the underlying STS client.
      */
-    constructor(clientConfig?: ConfigurationOptions);
+    constructor(clientConfig?: ClientConfiguration);
     /**
      * Refreshes credentials using AWS.STS.assumeRoleWithWebIdentity().
      */

test/credentials.spec.js

@@ -2121,6 +2121,14 @@ const exp = require('constants');
         });
       });
 
+      it('should forward endpoint param to sts client', function() {
+        var creds = new AWS.TokenFileWebIdentityCredentials({
+          endpoint: 'https://testendpoint'
+        });
+        creds.createClients();
+        expect(creds.service.endpoint.hostname).to.equal('testendpoint');
+      });
+
       return it('fails if params are not available in both environment variables or shared config', function(done) {
         delete process.env.AWS_WEB_IDENTITY_TOKEN_FILE;
         helpers.spyOn(AWS.util, 'getProfilesFromSharedConfig').andReturn({});
@@ -2359,7 +2367,7 @@ const exp = require('constants');
         });
         expect(creds).to.have.property('tokenCodeFn', null);
       });
-      it('should forward enpoint param to sts client', function() {
+      it('should forward endpoint param to sts client', function() {
         var creds = new AWS.ChainableTemporaryCredentials({
           stsConfig: { endpoint: 'https://testendpoint' }
         });