diff --git a/src/utils/getExportMode.js b/src/utils/getExportMode.js
index d525550..d61b128 100644
--- a/src/utils/getExportMode.js
+++ b/src/utils/getExportMode.js
@@ -1,7 +1,11 @@
 import { keys } from './object.js';
+import error from './error.js';
 
 function badExports ( option, keys ) {
-	throw new Error( `'${option}' was specified for options.exports, but entry module has following exports: ${keys.join(', ')}` );
+	error({
+		code: 'INVALID_EXPORT_OPTION',
+		message: `'${option}' was specified for options.exports, but entry module has following exports: ${keys.join(', ')}`
+	});
 }
 
 export default function getExportMode ( bundle, {exports: exportMode, moduleName, format} ) {
@@ -35,7 +39,10 @@ export default function getExportMode ( bundle, {exports: exportMode, moduleName
 	}
 
 	if ( !/(?:default|named|none)/.test( exportMode ) ) {
-		throw new Error( `options.exports must be 'default', 'named', 'none', 'auto', or left unspecified (defaults to 'auto')` );
+		error({
+			code: 'INVALID_EXPORT_OPTION',
+			message: `options.exports must be 'default', 'named', 'none', 'auto', or left unspecified (defaults to 'auto')`
+		});
 	}
 
 	return exportMode;
diff --git a/src/utils/transformBundle.js b/src/utils/transformBundle.js
index 8569ad5..03eb966 100644
--- a/src/utils/transformBundle.js
+++ b/src/utils/transformBundle.js
@@ -1,4 +1,5 @@
 import { decode } from 'sourcemap-codec';
+import error from './error.js';
 
 export default function transformBundle ( code, plugins, sourceMapChain, options ) {
 	return plugins.reduce( ( code, plugin ) => {
@@ -9,9 +10,11 @@ export default function transformBundle ( code, plugins, sourceMapChain, options
 		try {
 			result = plugin.transformBundle( code, { format : options.format } );
 		} catch ( err ) {
-			err.plugin = plugin.name;
-			err.message = `Error transforming bundle${plugin.name ? ` with '${plugin.name}' plugin` : ''}: ${err.message}`;
-			throw err;
+			error({
+				code: 'BAD_BUNDLE_TRANSFORMER',
+				message: `Error transforming bundle${plugin.name ? ` with '${plugin.name}' plugin` : ''}: ${err.message}`,
+				plugin: plugin.name
+			});
 		}
 
 		if ( result == null ) return code;
diff --git a/test/function/export-type-mismatch-b/_config.js b/test/function/export-type-mismatch-b/_config.js
index 25a7220..e501330 100644
--- a/test/function/export-type-mismatch-b/_config.js
+++ b/test/function/export-type-mismatch-b/_config.js
@@ -5,7 +5,8 @@ module.exports = {
 	bundleOptions: {
 		exports: 'blah'
 	},
-	generateError: function ( err ) {
-		assert.ok( /options\.exports must be 'default', 'named', 'none', 'auto', or left unspecified/.test( err.message ) );
+	generateError: {
+		code: 'INVALID_EXPORT_OPTION',
+		message: `options.exports must be 'default', 'named', 'none', 'auto', or left unspecified (defaults to 'auto')`
 	}
 };
diff --git a/test/function/export-type-mismatch-c/_config.js b/test/function/export-type-mismatch-c/_config.js
index 8df0d58..a1eca46 100644
--- a/test/function/export-type-mismatch-c/_config.js
+++ b/test/function/export-type-mismatch-c/_config.js
@@ -5,7 +5,8 @@ module.exports = {
 	bundleOptions: {
 		exports: 'none'
 	},
-	generateError: function ( err ) {
-		assert.ok( /'none' was specified for options\.exports/.test( err.message ) );
+	generateError: {
+		code: 'INVALID_EXPORT_OPTION',
+		message: `'none' was specified for options.exports, but entry module has following exports: default`
 	}
 };
diff --git a/test/function/export-type-mismatch/_config.js b/test/function/export-type-mismatch/_config.js
index 5b321d6..1ff9fd5 100644
--- a/test/function/export-type-mismatch/_config.js
+++ b/test/function/export-type-mismatch/_config.js
@@ -5,7 +5,8 @@ module.exports = {
 	bundleOptions: {
 		exports: 'default'
 	},
-	generateError: function ( err ) {
-		assert.ok( /'default' was specified for options\.exports/.test( err.message ) );
+	generateError: {
+		code: 'INVALID_EXPORT_OPTION',
+		message: `'default' was specified for options.exports, but entry module has following exports: foo`
 	}
 };
diff --git a/test/function/throws-only-first-transform-bundle/_config.js b/test/function/throws-only-first-transform-bundle/_config.js
index 9097f52..21804e7 100644
--- a/test/function/throws-only-first-transform-bundle/_config.js
+++ b/test/function/throws-only-first-transform-bundle/_config.js
@@ -7,19 +7,20 @@ module.exports = {
 			{
 				name: 'plugin1',
 				transformBundle: function () {
-					throw Error('Something happend 1');
+					throw Error( 'Something happened 1' );
 				}
 			},
 			{
 				name: 'plugin2',
 				transformBundle: function () {
-					throw Error('Something happend 2');
+					throw Error( 'Something happened 2' );
 				}
 			}
 		]
 	},
-	generateError: function ( err ) {
-		assert.equal( err.plugin, 'plugin1' );
-		assert.equal( err.message, 'Error transforming bundle with \'plugin1\' plugin: Something happend 1' );
+	generateError: {
+		code: 'BAD_BUNDLE_TRANSFORMER',
+		plugin: 'plugin1',
+		message: `Error transforming bundle with 'plugin1' plugin: Something happened 1`
 	}
-};
\ No newline at end of file
+};
diff --git a/test/test.js b/test/test.js
index cf5348b..250b25a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -276,7 +276,7 @@ describe( 'rollup', function () {
 							}
 						} catch ( err ) {
 							if ( config.generateError ) {
-								config.generateError( err );
+								compareError( err, config.generateError );
 							} else {
 								unintendedError = err;
 							}