create-react-app version difference

webpack-3.8.1

Hash: 2cd658402a991928a388
Version: webpack 3.8.1
Time: 686ms
                                   Asset      Size  Chunks                    Chunk Names
    ee53185497446fd9a1e1.hot-update.json  44 bytes          [emitted]
          static/media/logo.5d5d9eef.svg   2.67 kB
                     static/js/bundle.js   1.48 MB       0  [emitted]  [big]  main
    0.1fee3bef13b0061408c8.hot-update.js   5.15 kB       0  [emitted]         main
    1fee3bef13b0061408c8.hot-update.json  43 bytes          [emitted]
                 static/js/bundle.js.map   1.68 MB       0  [emitted]         main
0.1fee3bef13b0061408c8.hot-update.js.map   1.23 kB       0  [emitted]         main
                              index.html   1.61 kB          [emitted]

[./node_modules/react-dev-utils/formatWebpackMessages.js] ./node_modules/react-dev-utils/formatWebpackMessages.js 3.97 kB {0}
[./node_modules/react-dev-utils/launchEditorEndpoint.js] ./node_modules/react-dev-utils/launchEditorEndpoint.js 330 bytes {0}
[./node_modules/react-dev-utils/webpackHotDevClient.js] ./node_modules/react-dev-utils/webpackHotDevClient.js 8.02 kB {0}
[./node_modules/react-dom/index.js] ./node_modules/react-dom/index.js 1.36 kB {0} [built]
[./node_modules/react-error-overlay/lib/index.js] ./node_modules/react-error-overlay/lib/index.js 415 kB {0}
[./node_modules/react-scripts/config/polyfills.js] ./node_modules/react-scripts/config/polyfills.js 1.09 kB {0}
[./node_modules/react/index.js] ./node_modules/react/index.js 190 bytes {0} [built]
[./node_modules/sockjs-client/lib/entry.js] ./node_modules/sockjs-client/lib/entry.js 244 bytes {0}

[0] multi ./node_modules/react-scripts/config/polyfills.js ./node_modules/react-dev-utils/webpackHotDevClient.js ./src/index.js 52 bytes {0}

[./node_modules/strip-ansi/index.js] ./node_modules/strip-ansi/index.js 161 bytes {0}
[./node_modules/url/url.js] ./node_modules/url/url.js 23.3 kB {0}
[./node_modules/whatwg-fetch/fetch.js] ./node_modules/whatwg-fetch/fetch.js 12.7 kB {0}
[./src/index.css] ./src/index.css 1.22 kB {0}
[./src/index.js] ./src/index.js 429 bytes {0}
[./src/registerServiceWorker.js] ./src/registerServiceWorker.js 4.24 kB {0}
    + 106 hidden modules
Child html-webpack-plugin for "index.html":
                                   Asset      Size  Chunks             Chunk Names
                              index.html    570 kB       1
    ee53185497446fd9a1e1.hot-update.json  44 bytes          [emitted]
    [./node_modules/html-webpack-plugin/lib/loader.js!./public/index.html] ./node_modules/html-webpack-plugin/lib/loader.js!./public/index.html 1.99 kB {1}
    [./node_modules/lodash/lodash.js] ./node_modules/lodash/lodash.js 540 kB {1}
    [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 488 bytes {1}
    [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 495 bytes {1}
webpack: Compiled successfully.

webpack-4.5.0

Hash: 2d0dbfc2da48dbfaeb10
Version: webpack 4.5.0
Time: 1652ms
Built at: 2018-4-9 23:03:19
                                      Asset      Size        Chunks                    Chunk Names
       2cb27c144d8e48ac4edf.hot-update.json  56 bytes                [emitted]
       deead1b54b6af9e01a3f.hot-update.json  44 bytes                [emitted]
                    static/js/main.chunk.js  16.2 KiB          main  [emitted]         main
                       static/js/1.chunk.js  1.38 MiB             1  [emitted]  [big]
                        static/js/bundle.js  29.5 KiB  runtime~main  [emitted]         runtime~main
    main.2cb27c144d8e48ac4edf.hot-update.js  2.96 KiB          main  [emitted]         main
             static/media/logo.5d5d9eef.svg  2.61 KiB
                static/js/main.chunk.js.map    12 KiB          main  [emitted]         main
main.2cb27c144d8e48ac4edf.hot-update.js.map  1.21 KiB          main  [emitted]         main
                   static/js/1.chunk.js.map   1.5 MiB             1  [emitted]
                    static/js/bundle.js.map  30.7 KiB  runtime~main  [emitted]         runtime~main
                                 index.html  1.64 KiB                [emitted]

Entrypoint main [big] = static/js/bundle.js static/js/bundle.js.map static/js/1.chunk.js static/js/1.chunk.js.map static/js/main.chunk.js main.2cb27c144d8e48ac4edf.hot-update.js static/js/main.chunk.js.map main.2cb27c144d8e48ac4edf.hot-update.js.map

[./node_modules/object-assign/index.js] 2.17 KiB {1}
[./node_modules/promise/lib/es6-extensions.js] 2.62 KiB {1}
[./node_modules/promise/lib/rejection-tracking.js] 2.6 KiB {1}
[./node_modules/react-dev-utils/formatWebpackMessages.js] 4.13 KiB {1}
[./node_modules/react-dev-utils/launchEditorEndpoint.js] 329 bytes {1}
[./node_modules/react-dev-utils/node_modules/strip-ansi/index.js] 150 bytes {1}
[./node_modules/react-dev-utils/webpackHotDevClient.js] 7.69 KiB {1}
[./node_modules/react-dom/index.js] 1.32 KiB {1} [built]

   [0] multi ./node_modules/react-scripts/config/polyfills.js ./node_modules/react-dev-utils/webpackHotDevClient.js ./src/index.js 52 bytes {main}

[./node_modules/react-scripts/config/polyfills.js] 1.07 KiB {1}
[./node_modules/sockjs-client/lib/entry.js] 243 bytes {1}
[./node_modules/url/url.js] 22.2 KiB {1}
[./node_modules/whatwg-fetch/fetch.js] 13 KiB {1}
[./src/index.css] 1.25 KiB {main}
[./src/index.js] 643 bytes {main}
    + 110 hidden modules
Child html-webpack-plugin for "index.html":
                                   Asset      Size  Chunks             Chunk Names
                              index.html   557 KiB       1
    deead1b54b6af9e01a3f.hot-update.json  44 bytes          [emitted]
    Entrypoint undefined = index.html
    [./node_modules/html-webpack-plugin/lib/loader.js!./public/index.html] 1.78 KiB {1}
    [./node_modules/lodash/lodash.js] 527 KiB {1}
    [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 492 bytes {1}
    [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 552 bytes {1}
ℹ ｢wdm｣: Compiled successfully.