diff --git a/src/rollup/index.ts b/src/rollup/index.ts
index 7ece9ca63e8..611c209d085 100644
--- a/src/rollup/index.ts
+++ b/src/rollup/index.ts
@@ -1,4 +1,5 @@
 import { EventEmitter } from 'events';
+import { Asset } from '../../node_modules/rollup';
 import { optimizeChunks } from '../chunk-optimization';
 import Graph from '../Graph';
 import { createAddons } from '../utils/addons';
@@ -316,7 +317,14 @@ export default function rollup(rawInputOptions: GenericConfigObject): Promise<Ro
 							});
 						}
 						return generate(outputOptions, true).then(bundle => {
-							if (Object.keys(bundle).length > 1) {
+							let chunkCnt = 0;
+							for (const fileName of Object.keys(bundle)) {
+								const file = bundle[fileName];
+								if ((<OutputAsset>file).isAsset) continue;
+								chunkCnt++;
+								if (chunkCnt > 1) break;
+							}
+							if (chunkCnt > 1) {
 								if (outputOptions.sourcemapFile)
 									error({
 										code: 'INVALID_OPTION',
diff --git a/src/rollup/types.d.ts b/src/rollup/types.d.ts
index 0b81f1c7a02..b4257309b7f 100644
--- a/src/rollup/types.d.ts
+++ b/src/rollup/types.d.ts
@@ -196,7 +196,6 @@ export interface Plugin {
 		options: OutputOptions,
 		chunk: OutputChunk
 	) => void | Promise<void>;
-	/** @deprecated */
 	generateBundle?: (
 		this: PluginContext,
 		options: OutputOptions,
diff --git a/test/function/index.js b/test/function/index.js
index 7d871ee21a3..0614c408aa2 100644
--- a/test/function/index.js
+++ b/test/function/index.js
@@ -41,7 +41,7 @@ runTestSuiteWithSamples('function', path.resolve(__dirname, 'samples'), (dir, co
 								(config.options || {}).output || {}
 							)
 						)
-						.then(code => {
+						.then(({ output: [code] }) => {
 							if (config.generateError) {
 								unintendedError = new Error('Expected an error while generating output');
 							}
diff --git a/test/hooks/index.js b/test/hooks/index.js
index b1345e9689c..9649d4f635c 100644
--- a/test/hooks/index.js
+++ b/test/hooks/index.js
@@ -272,8 +272,9 @@ describe('hooks', () => {
 				return bundle.generate({ format: 'es' });
 			})
 			.then(({ output }) => {
-				assert.equal(output['assets/test-19916f7d.ext'], 'hello world');
-				assert.equal(output['input.js'].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[0].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[1].fileName, 'assets/test-19916f7d.ext');
+				assert.equal(output[1].source, 'hello world');
 
 				return rollup
 				.rollup({
@@ -293,8 +294,9 @@ describe('hooks', () => {
 				return bundle.generate({ format: 'es' });
 			})
 			.then(({ output }) => {
-				assert.equal(output['assets/test-19916f7d.ext'], 'hello world');
-				assert.equal(output['input.js'].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[0].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[1].fileName, 'assets/test-19916f7d.ext');
+				assert.equal(output[1].source, 'hello world');
 			});
 	});
 
@@ -322,8 +324,9 @@ describe('hooks', () => {
 				return bundle.generate({ format: 'es' });
 			})
 			.then(({ output }) => {
-				assert.equal(output['assets/test-19916f7d.ext'], 'hello world');
-				assert.equal(output['input.js'].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[0].code, `var input = new URL('../assets/test-19916f7d.ext', import.meta.url).href;\n\nexport default input;\n`);
+				assert.equal(output[1].fileName, 'assets/test-19916f7d.ext');
+				assert.equal(output[1].source, 'hello world');
 
 				return rollup
 				.rollup({
@@ -346,8 +349,8 @@ describe('hooks', () => {
 			})
 			.then(({ output }) => {
 				assert.equal(runs, 2);
-				assert.equal(output['assets/test-19916f7d.ext'], undefined);
-				assert.equal(output['input.js'].code.trim(), `alert('hello world');`);
+				assert.equal(output[0].code.trim(), `alert('hello world');`);
+				assert.equal(output.length, 1);
 			});
 	});
 
@@ -483,7 +486,7 @@ module.exports = input;
 				return bundle.generate({ format: 'es' });
 			})
 			.then(({ output: [,output] }) => {
-				assert.equal(output['assets/test-19916f7d.ext'], 'hello world');
+				assert.equal(output.source, 'hello world');
 				assert.equal(thrown, true);
 			});
 	});
@@ -964,8 +967,8 @@ module.exports = input;
 				format: 'es'
 			});
 		})
-		.then(bundle => {
-			assert.equal(bundle.code.trim(), `alert('hello');`);
+		.then(({ output }) => {
+			assert.equal(output[0].code.trim(), `alert('hello');`);
 		});
 	});
 });
\ No newline at end of file
diff --git a/test/misc/optionList.js b/test/misc/optionList.js
index 678f34fc159..e1b48ffc82d 100644
--- a/test/misc/optionList.js
+++ b/test/misc/optionList.js
@@ -1,3 +1,3 @@
 exports.input = 'acorn, acornInjectPlugins, cache, cacheExpiry, chunkGroupingSize, context, entry, experimentalTopLevelAwait, external, inlineDynamicImports, input, manualChunks, moduleContext, onwarn, optimizeChunks, perf, plugins, preferConst, preserveModules, preserveSymlinks, shimMissingExports, treeshake, watch';
-exports.flags = 'acorn, acornInjectPlugins, amd, assetFileNames, banner, c, cache, cacheExpirt, chunkFileNames, chunkGroupingSize, compact, config, context, dir, e, entry, entryFileNames, environment, esModule, experimentalTopLevelAwait, exports, extend, external, f, file, footer, format, freeze, g, globals, h, i, indent, inlineDynamicImports, input, interop, intro, m, manualChunks, moduleContext, n, name, namespaceToStringTag, noConflict, o, onwarn, optimizeChunks, outro, paths, perf, plugins, preferConst, preserveModules, preserveSymlinks, shimMissingExports, silent, sourcemap, sourcemapFile, strict, treeshake, v, w, watch';
+exports.flags = 'acorn, acornInjectPlugins, amd, assetFileNames, banner, c, cache, cacheExpiry, chunkFileNames, chunkGroupingSize, compact, config, context, dir, e, entry, entryFileNames, environment, esModule, experimentalTopLevelAwait, exports, extend, external, f, file, footer, format, freeze, g, globals, h, i, indent, inlineDynamicImports, input, interop, intro, m, manualChunks, moduleContext, n, name, namespaceToStringTag, noConflict, o, onwarn, optimizeChunks, outro, paths, perf, plugins, preferConst, preserveModules, preserveSymlinks, shimMissingExports, silent, sourcemap, sourcemapFile, strict, treeshake, v, w, watch';
 exports.output = 'amd, assetFileNames, banner, dir, chunkFileNames, compact, entryFileNames, esModule, exports, extend, file, footer, format, freeze, globals, indent, interop, intro, name, namespaceToStringTag, noConflict, outro, paths, sourcemap, sourcemapFile, strict';
diff --git a/test/sourcemaps/index.js b/test/sourcemaps/index.js
index f091705619b..bc3dac1b6d5 100644
--- a/test/sourcemaps/index.js
+++ b/test/sourcemaps/index.js
@@ -59,7 +59,7 @@ function generateAndTestBundle(bundle, outputOptions, config, format, warnings)
 			}
 			return bundle.generate(outputOptions);
 		})
-		.then(({ code, map }) => {
+		.then(({ output: [{ code, map }] }) => {
 			if (config.test) {
 				return config.test(code, map, { format });
 			}