Avoid exports:auto warning on format:es

src/Bundle.js

@@ -350,7 +350,7 @@ export default class Bundle {
 		const format = options.format || 'es';
 
 		// Determine export mode - 'default', 'named', 'none'
-		const exportMode = getExportMode( this, options.exports, options.moduleName );
+		const exportMode = getExportMode( this, options );
 
 		let magicString = new MagicStringBundle({ separator: '\n\n' });
 		const usedModules = [];

src/utils/getExportMode.js

@@ -4,7 +4,7 @@ function badExports ( option, keys ) {
 	throw new Error( `'${option}' was specified for options.exports, but entry module has following exports: ${keys.join(', ')}` );
 }
 
-export default function getExportMode ( bundle, exportMode, moduleName ) {
+export default function getExportMode ( bundle, {exports: exportMode, moduleName, format} ) {
 	const exportKeys = keys( bundle.entryModule.exports )
 		.concat( keys( bundle.entryModule.reexports ) )
 		.concat( bundle.entryModule.exportAllSources ); // not keys, but makes our job easier this way
@@ -23,7 +23,7 @@ export default function getExportMode ( bundle, exportMode, moduleName ) {
 		} else if ( exportKeys.length === 1 && exportKeys[0] === 'default' ) {
 			exportMode = 'default';
 		} else {
-			if ( bundle.entryModule.exports.default ) {
+			if ( bundle.entryModule.exports.default && format !== 'es') {
 				bundle.onwarn( `Using named and default exports together. Consumers of your bundle will have to use ${moduleName || 'bundle'}['default'] to access the default export, which may not be what you want. Use \`exports: 'named'\` to disable this warning. See https://github.com/rollup/rollup/wiki/JavaScript-API#exports for more information` );
 			}
 			exportMode = 'named';