Basically there are 3 main features provided by Angular Language Service,
- Autocompletion: Autocompletion can speed up your development time by providing you with contextual possibilities and hints as you type with in an interpolation and elements.
- Error checking: It can also warn you of mistakes in your code.
- Navigation: Navigation allows you to hover a component, directive, module and then click and press F12 to go directly to its definition.