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The project is https://github.com/easychessanimations/htmltest .

I studied all the answers related to webpack dev server auto page reload.

When I do npm run start locally, it auto builds / reloads page on source change, so the dev server config must be right:

devServer: { 
    contentBase: path.join(__dirname, "dist"),    
    port: 8080,
    hot: true,
    watchContentBase: true,        
    watchOptions: {
        poll: true
    },
  },

When I do the same from the gitpod terminal, online, the page is auto rebuilt, but not auto reloaded ( no matter whether I open it in a gitpod window or in a full blown browser tab ). If I reload manually, the changes are reflected.

What extra config do I need to make it work under gitpod?

You can play around with it using this link ( of course first you need to authorize gitpod with your github account ):

https://gitpod.io/#https://github.com/easychessanimations/htmltest

in the gitpod terminal type:

npm install
npm run build
npm run start
easychessanimations
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1 Answers1

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Webpack HMR needs to be configured accordingly. Adding the following three properties to the webpack.conf does the trick:

  devServer: { 
      // make HMR work - start
      host: '0.0.0.0',
      disableHostCheck: true,
      public: require('child_process').execSync('gp url 8080').toString().trim(),
      // make HMR work - end
      
      contentBase: path.join(__dirname, "dist"),    
      port: 8080,
      hot: true,
      watchContentBase: true,        
      watchOptions: {
          poll: true
      },
    },

Here is a working snapshot:

https://gitpod.io/#snapshot/daa14130-2f44-430d-93ab-2d4ed980fc2c

Sven Efftinge
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  • Works like charm. Thanks a lot. – easychessanimations Oct 13 '20 at 17:11
  • One little caveat is that it broke the netlify build, because `require('child_process').execSync('gp url 8080')` won't work there ( `gp` is unknown ). Solution is to determine this value in a try block and let it fail on netlify ( makes no difference as it is only a dev config ). – easychessanimations Oct 13 '20 at 17:58