diff --git a/.rollup/index.mjs b/.rollup/index.mjs
index c630b5bc9..33425d8cb 100644
--- a/.rollup/index.mjs
+++ b/.rollup/index.mjs
@@ -14,19 +14,30 @@ const defaultOptions = () => ({
   output: undefined
 })
 
+const sharedOutput = {
+  dir: 'dist',
+  entryFileNames: '[name].js',
+  preserveModules: true,
+  generatedCode: {
+    preset: 'es2015',
+  }
+}
+
 function createRollupConfig (options = defaultOptions()) {
   const packageJson = JSON.parse(fs.readFileSync(`${process.cwd()}/package.json`))
 
   return {
     input: options.input || 'src/index.ts',
-    output: options.output || {
-      dir: 'dist',
-      format: 'esm',
-      preserveModules: true,
-      generatedCode: {
-        preset: 'es2015',
+    output: options.output || [
+      {
+        ...sharedOutput,
+        format: 'cjs'
+      },
+      {
+        ...sharedOutput,
+        format: 'esm'
       }
-    },
+    ],
     external: ['@bugsnag/core'].concat(options.external),
     plugins: [
       replace({
diff --git a/packages/plugin-app-duration/rollup.config.npm.mjs b/packages/plugin-app-duration/rollup.config.npm.mjs
index 328994acc..1501d039d 100644
--- a/packages/plugin-app-duration/rollup.config.npm.mjs
+++ b/packages/plugin-app-duration/rollup.config.npm.mjs
@@ -1,25 +1,5 @@
 import createRollupConfig from '../../.rollup/index.mjs'
 
 export default createRollupConfig({
-    input: 'src/app-duration.ts',
-    output: [
-        {
-            dir: `dist`,
-            entryFileNames: '[name].js',
-            format: 'cjs',
-            preserveModules: true,
-            generatedCode: {
-              preset: 'es2015',
-            }
-        },
-        {
-            dir: `dist`,
-            entryFileNames: '[name].mjs',
-            format: 'esm',
-            preserveModules: true,
-            generatedCode: {
-                preset: 'es2015',
-            }
-        }
-    ]
+    input: 'src/app-duration.ts'
 })
diff --git a/packages/plugin-window-onerror/rollup.config.npm.mjs b/packages/plugin-window-onerror/rollup.config.npm.mjs
index f001dd2b8..356d458f9 100644
--- a/packages/plugin-window-onerror/rollup.config.npm.mjs
+++ b/packages/plugin-window-onerror/rollup.config.npm.mjs
@@ -1,25 +1,5 @@
 import createRollupConfig from '../../.rollup/index.mjs'
 
 export default createRollupConfig({
-    input: 'src/onerror.ts',
-    output: [
-        {
-            dir: `dist`,
-            entryFileNames: '[name].js',
-            format: 'cjs',
-            preserveModules: true,
-            generatedCode: {
-              preset: 'es2015',
-            }
-        },
-        {
-            dir: `dist`,
-            entryFileNames: '[name].mjs',
-            format: 'esm',
-            preserveModules: true,
-            generatedCode: {
-                preset: 'es2015',
-            }
-        }
-    ]
+    input: 'src/onerror.ts'
 })
diff --git a/packages/plugin-window-unhandled-rejection/rollup.config.npm.mjs b/packages/plugin-window-unhandled-rejection/rollup.config.npm.mjs
index 6b32b19f9..ce422d72a 100644
--- a/packages/plugin-window-unhandled-rejection/rollup.config.npm.mjs
+++ b/packages/plugin-window-unhandled-rejection/rollup.config.npm.mjs
@@ -1,25 +1,5 @@
 import createRollupConfig from '../../.rollup/index.mjs'
 
 export default createRollupConfig({
-    input: 'src/unhandled-rejection.ts',
-    output: [
-        {
-            dir: `dist`,
-            entryFileNames: '[name].js',
-            format: 'cjs',
-            preserveModules: true,
-            generatedCode: {
-              preset: 'es2015',
-            }
-        },
-        {
-            dir: `dist`,
-            entryFileNames: '[name].mjs',
-            format: 'esm',
-            preserveModules: true,
-            generatedCode: {
-                preset: 'es2015',
-            }
-        }
-    ]
+    input: 'src/unhandled-rejection.ts'
 })