javascript - Why does Webpack build of React web app fail when project is built in a different folder? -


i have react project built using webpack. weird issue when run react app in original folder builds , runs without error. when copy files in folder, paste in new folder , try build same project fails. have tried changing folder name, changing config files reflect new folder name, fails in app.js , points error in render method. few points note:

  • i havent hardcoded paths
  • i have cleaned node modules , rebuilt project groundup including cleaning npm cache.
  • the same project works in original folder without errors.

the error follows:

       version: webpack 2.2.1        time: 1520ms        asset       size  chunks             chunk names        app.js     219 kb       0  [emitted]  main        index.html  636 bytes          [emitted]          chunk    {0} app.js (main) 208 kb [entry] [rendered]        [1] (webpack)/buildin/global.js 509 bytes {0} [built]        [32] ./src/app.js 783 bytes {0} [built] [failed] [1 error]        [33] (webpack)-dev-server/client?http://0.0.0.0:8080 4.16 kb {0}         [built]        [34] ./~/ansi-regex/index.js 135 bytes {0} [built]        [35] ./~/punycode/punycode.js 14.7 kb {0} [built]        [36] ./~/querystring-es3/decode.js 2.51 kb {0} [built]        [38] ./~/querystring-es3/index.js 127 bytes {0} [built]        [40] ./~/sockjs-client/lib/entry.js 244 bytes {0} [built]        [47] ./~/sockjs-client/lib/main.js 11.9 kb {0} [built]        [49] ./~/sockjs-client/lib/transport-list.js 613 bytes {0}         [built]        [66] ./~/strip-ansi/index.js 161 bytes {0} [built]        [68] ./~/url/url.js 23.3 kb {0} [built]        [69] ./~/url/util.js 314 bytes {0} [built]        [70] (webpack)-dev-server/client/socket.js 897 bytes {0} [built]        [72] multi (webpack)-dev-server/client?http://0.0.0.0:8080         ./src/app.js         40 bytes {0} [built]        + 58 hidden modules         error in ./src/app.js        module build failed: syntaxerror: unexpected token (39:2)         37 | // });         38 | reactdom.render(        > 39 |   <div>hello</div>,        |   ^        40 |   document.getelementbyid('content'),        41 | );        42 |          @ multi (webpack)-dev-server/client?http://0.0.0.0:8080         ./src/app.js        child html-webpack-plugin "index.html":        chunk    {0} index.html 542 kb [entry] [rendered]        [0] ./~/lodash/lodash.js 540 kb {0} [built]        [1] (webpack)/buildin/global.js 509 bytes {0} [built]        [2] (webpack)/buildin/module.js 517 bytes {0} [built]        [3] ./~/html-webpack-plugin/lib/loader.js!./src/index.html 1.32         kb         {0} [built]        webpack: failed compile.

the above error doesn't happen when running in original folder. issue here?

your .babelrc file in root of project directory, , thats webpack looks use loaders , presets. can workaround using following config

    {       use: [         {           loader: 'babel-loader',           options: {             babelrc: false,             presets: [require.resolve('babel-preset-react-app')], // <- whatever preset wish             cachedirectory: true,           }         }       ],       test: /\.js$/,       exclude: /node_modules/     },

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