This is possible if you look closely at the settings for TypeScript in IDEA/WebStorm:

> Select the Use TypeScript Service check box to get native support from the TypeScript Language Service according to the up-to-date specifications. In this case syntax and error highlighting is performed based on the annotations retrieved from the TypeScript Language Service while code completion lists contain both suggestions from the TypeScript Language Service and suggestions calculated by IntelliJ IDEA itself.

https://www.jetbrains.com/help/idea/2016.2/typescript-suppor...