npm install --save @types/webpack-sources
This package contains type definitions for webpack-sources (https://github.com/webpack/webpack-sources).
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/webpack-sources
Additional Details
These definitions were written by e-cloud https://github.com/e-cloud, Chris Eppstein https://github.com/chriseppstein.