Lib.es2015.core.d.ts Duplicate identifier

[14:23:50] ngc: Error: /node_modules/typescript/lib/lib.es2015.core.d.ts:17:14: Duplicate identifier 'PropertyKey'.

I am getting this error after upgrading to RC0 Ionic 2. I did use the provided tsconfig file from the repository.

I’m having the exact same issue when trying to run my app on my device. I just used the default tsconfig from when I updated. I get the following message along with a slew of others, and I’m not experienced enough to properly diagnose. Thanks!
/node_modules/typescript/lib/lib.es2015.core.d.ts:17:14: Duplicate identifier 'PropertyKey'.

I had the same problem when i tried to compile for device with ionic2 rc0. no idea for the moment …

edit: issue solve … comment a part in tsconfig

// “lib”: [
// “dom”,
// “es2015”
// ],