npm install --save @types/normalize-package-data
This package contains type definitions for normalize-package-data (https://github.com/npm/normalize-package-data#readme).
Files were exported from https://www.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/normalize-package-data
Additional Details
These definitions were written by Jeff Dickey https://github.com/jdxcode.