Error: Cannot find module "react/addons"

[strarsis]

Trying to get the x_simple map demo running, I get this build error:

Error: Cannot find module "react/addons"

[anianroid]

Replace 'react/addons' with 'react' and import PropTypes seperately from 'prop-types' npm. It has been moved off react since 15.x

ref. https://reactjs.org/docs/typechecking-with-proptypes.html