build: upgrade webpack and related deps (#34990)

build/webpack/webpack.config.base.js

@@ -75,9 +75,17 @@ module.exports = ({
 
     if (targetDeletesNodeGlobals) {
       plugins.push(new webpack.ProvidePlugin({
-        process: ['@electron/internal/common/webpack-provider', 'process'],
+        Buffer: ['@electron/internal/common/webpack-provider', 'Buffer'],
         global: ['@electron/internal/common/webpack-provider', '_global'],
-        Buffer: ['@electron/internal/common/webpack-provider', 'Buffer']
+        process: ['@electron/internal/common/webpack-provider', 'process']
+      }));
+    }
+
+    // Webpack 5 no longer polyfills process or Buffer.
+    if (!alwaysHasNode) {
+      plugins.push(new webpack.ProvidePlugin({
+        Buffer: ['buffer', 'Buffer'],
+        process: 'process/browser'
       }));
     }
 
@@ -129,7 +137,12 @@ if ((globalThis.process || binding.process).argv.includes("--profile-electron-in
           // Force timers to resolve to our dependency that doesn't use window.postMessage
           timers: path.resolve(electronRoot, 'node_modules', 'timers-browserify', 'main.js')
         },
-        extensions: ['.ts', '.js']
+        extensions: ['.ts', '.js'],
+        fallback: {
+          // We provide our own "timers" import above, any usage of setImmediate inside
+          // one of our renderer bundles should import it from the 'timers' package
+          setImmediate: false
+        }
       },
       module: {
         rules: [{
@@ -150,10 +163,7 @@ if ((globalThis.process || binding.process).argv.includes("--profile-electron-in
       },
       node: {
         __dirname: false,
-        __filename: false,
-        // We provide our own "timers" import above, any usage of setImmediate inside
-        // one of our renderer bundles should import it from the 'timers' package
-        setImmediate: false
+        __filename: false
       },
       optimization: {
         minimize: env.mode === 'production',