Address comments.

Author: brendandburns

examples/typescript/exec/exec-example.ts

@@ -1,4 +1,5 @@
-import k8s = require('@kubernetes/client-node');
+import * as k8s from '@kubernetes/client-node';
+import * as stream from 'stream';
 
 const command = process.argv[2];
 
@@ -7,11 +8,11 @@ kc.loadFromDefault();
 
 const exec = new k8s.Exec(kc);
 exec.exec('default', 'nginx-4217019353-9gl4s', 'nginx', command,
-    process.stdout, process.stderr, process.stdin,
+    process.stdout as stream.Writable, process.stderr as stream.Writable, process.stdin as stream.Readable,
+    true /* tty */,
     (status: k8s.V1Status) => {
         // tslint:disable-next-line:no-console
         console.log('Exited with status:');
         // tslint:disable-next-line:no-console
         console.log(JSON.stringify(status, null, 2));
-    },
-    true /* tty */);
+    });