Add canvas as externals in webpack.config.js

debian/patches/0740-use-packaged-modules.patch

@@ -16,7 +16,16 @@ Use debian packaged node modules when available
  const CopyWebpackPlugin = require('copy-webpack-plugin');
  const vendorDllHash = require('./helpers/vendor_dll_hash');
  
-@@ -159,13 +158,13 @@
+@@ -150,6 +149,8 @@
+ 
+   entry: generateEntries,
+ 
++  externals: [ 'canvas'  ],
++
+   output: {
+     path: path.join(ROOT_PATH, 'public/assets/webpack'),
+     publicPath: '/assets/webpack/',
+@@ -159,13 +160,13 @@
    },
  
    resolve: {
@@ -33,7 +42,7 @@ Use debian packaged node modules when available
    },
  
    module: {
-@@ -178,9 +177,13 @@
+@@ -178,9 +179,13 @@
        },
        {
          test: /\.js$/,
@@ -48,7 +57,7 @@ Use debian packaged node modules when available
          loader: 'babel-loader',
          options: {
            cacheDirectory: path.join(CACHE_PATH, 'babel-loader'),
-@@ -516,19 +519,6 @@
+@@ -516,19 +521,6 @@
      // enable HMR only in webpack-dev-server
      DEV_SERVER_LIVERELOAD && new webpack.HotModuleReplacementPlugin(),
  
@@ -68,7 +77,7 @@ Use debian packaged node modules when available
      new webpack.DefinePlugin({
        // This one is used to define window.gon.ee and other things properly in tests:
        'process.env.IS_EE': JSON.stringify(IS_EE),
-@@ -563,6 +553,7 @@
+@@ -563,6 +555,7 @@
  
    node: {
      fs: 'empty', // sqljs requires fs