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~ symbol in import statements gives an error

what does ~ (tilde) symbol mean in import statements in angular 6?
~ symbol in import statements gives me an error: File to import not found or unreadable:

Which file contains the path for ~(tilde) symbol stored?

I am using Visual Studio Code.
Angular CLI: 6.1.3
npm: 5.6.0
node: 8.11.3