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Section 5.3.1,

Shouldn't react and react-dom be saved as a dependency and not dev. Also its missing the install for react preset. I think it should be:
npm i --save react react-dom
npm i --save-dev gulp-sourcemaps gulp-babel babel-preset-es2015
npm i --save-dev gulp-concat babel-preset-react

Section 5.4.2
To be consistent with the previous sections, should add "cd webpack-example"