angular 2 websql typings

Question

I am writing an app in electron using angular 4. I need a database and want to use websql but I cannot find a way to import websql typings.

I added @types/websql. In my IDE, there is no compil error when i do :

const db: Database = window.openDatabase('foo', '1.0', 'foo', 2 * 1024 * 1024);

but ng serve gives me :

Property 'openDatabase' does not exist on type 'Window'

I do not have any import specific to @types/websql. As it is not a module, I don't know how to import it.

Does anyone have any idea on how I can import this ?

Answer 1

Ok, I found the solution.

ng-cli generate a tsconfig.app.json with a property types set to []. If I understand tsc doc correctly, it prevents the compiler to use the typeRoots property.

By simply removing this property, my code compile.