require( 'r-script' ) showing error in angularjs 2 ERROR in ./~/r-script/index.js Module not found: Error: Can't resolve 'child_process' in 'project_path/node_modules/r-script' @ ./~/r-script/index.js 2:20-44 @ ./src/app/app.module.ts @ ./src/main.ts @ multi webpack-dev-server/client?http://192.168.1.252:4200 ./src/main.ts