Move gulp specific code to gulpfile.editor.js

build/gulpfile.editor.js

@@ -16,6 +16,8 @@ const cp = require('child_process');
 const compilation = require('./lib/compilation');
 const monacoapi = require('./monaco/api');
 const fs = require('fs');
+const webpack = require('webpack');
+const webpackGulp = require('webpack-stream');
 
 let root = path.dirname(__dirname);
 let sha1 = util.getVersion(root);
@@ -359,7 +361,31 @@ gulp.task('editor-distro',
 );
 
 const bundleEditorESMTask = task.define('editor-esm-bundle-webpack', () => {
-	return standalone.bundleESM();
+	const result = es.through();
+
+	const webpackConfigPath = path.join(root, 'build/monaco/monaco.webpack.config.js');
+
+	const webpackConfig = {
+		...require(webpackConfigPath),
+		...{ mode: 'production' }
+	};
+
+	const webpackDone = (err, stats) => {
+		if (err) {
+			result.emit('error', err);
+			return;
+		}
+		const { compilation } = stats;
+		if (compilation.errors.length > 0) {
+			result.emit('error', compilation.errors.join('\n'));
+		}
+		if (compilation.warnings.length > 0) {
+			result.emit('data', compilation.warnings.join('\n'));
+		}
+	};
+
+	return webpackGulp(webpackConfig, webpack, webpackDone)
+		.pipe(gulp.dest('out-editor-esm-bundle'));
 });
 
 gulp.task('editor-esm-bundle',