Add API for hooking into the web and static entries

[tribou]

I saw you can respond to route transitions, but is there a way to hook up browser initialization tasks like creating a redux store or starting the offline-plugin runtime?

[benstepp]

We needed to put redux in our latest project, and as far as I know there isn't a way using gatsby-browser to hook into the entry. What we did was just copy the static-entry and web-entry files and just did what we needed there. We used modifyWebpackConfig to point to the entries. I think a great idea for a starter would be one set up with redux.

export function modifyWebpackConfig(config, stage) {
  if (stage === 'develop') {
    config._config.entry = [
      require.resolve('webpack-hot-middleware/client'),
      require.resolve('babel-polyfill'),
      path.resolve(__dirname, 'web-entry.js'),
    ]
  } else if (stage === 'build-javascript') {
    config._config.entry = {
      main: [require.resolve('babel-polyfill'), path.resolve(__dirname, 'web-entry.js')]
    }
  } else if (stage === 'build-html') {
    config._config.entry = {
      main: [require.resolve('babel-polyfill'), path.resolve(__dirname, 'static-entry.js')]
    }
  }

  return config
}

[KyleAMathews]

This would be an excellent hook to add.

[stale]

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[stale]

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