compile to es6?

When target is set to es6, it produces an error:

> tsc -p src/core/tsconfig.json && tsc

node_modules/typescript/lib/lib.es2015.collection.d.ts:28:14 - error TS2687: All declarations of 'size' must have identical modifiers.

28     readonly size: number;
                ~~~~


It seems that problem is with versions of types/node@ and typescript...