rollup-plugin-internal

1.0.4 verified Mon Apr 27 auth: no javascript

Rollup plugin (v1.0.4) that forces specified dependencies to be treated as internal, preventing Rollup from externalizing them. Useful when bundling libraries that re-export certain peer dependencies. Minimal configuration: just pass an array of module names. Works with Rollup >=0.45.2. Alternative to manual external() or other deduplication plugins.

Common errors

error Error: Cannot find module 'rollup-plugin-internal' ↓

cause Package not installed or missing from node_modules.

fix

Run 'npm install rollup-plugin-internal --save-dev' or 'yarn add -D rollup-plugin-internal'.

error TypeError: Object(...) is not a function ↓

cause Using named import { internal } instead of default import.

fix

Change to 'import internal from 'rollup-plugin-internal''.

error (!) Plugin internal: Specified modules are empty array (nothing to mark internal) ↓

cause Passed empty array or no arguments to the plugin.

fix

Provide an array with at least one module name, e.g., internal(['react']).

Warnings

gotcha The plugin must be listed last in the plugins array to ensure it correctly overrides externalization done by other plugins. ↓

fix Always place internal() as the final plugin in the rollup config plugins array.

gotcha Specified modules are marked as internal but not bundled automatically; other plugins (like node-resolve) must still resolve them. ↓

fix Ensure modules are resolvable by your bundle (e.g., use rollup-plugin-node-resolve).

deprecated The package has not been updated since 2018 and may not work with newer Rollup versions (>2.x) due to plugin API changes. ↓

fix Consider migrating to Rollup's built-in 'output.inlineDynamicImports' or custom resolveId hooks.

Install

npm install rollup-plugin-internal

yarn add rollup-plugin-internal

pnpm add rollup-plugin-internal

Imports

default import
wrong
```
const internal = require('rollup-plugin-internal')
```
correct
```
import internal from 'rollup-plugin-internal'
```
The package exports a default function; CommonJS require works as well but TypeScript may need esModuleInterop for default import.

Named import (incorrect)

wrong

import { internal } from 'rollup-plugin-internal'

correct

import internal from 'rollup-plugin-internal'

There is no named export 'internal'; always use default import.

Quickstart

Shows basic usage: import the plugin, pass an array of module names to keep internal.

// rollup.config.js
import internal from 'rollup-plugin-internal';

export default {
  input: 'src/index.js',
  output: { file: 'dist/bundle.js', format: 'es' },
  plugins: [
    internal(['lodash', 'moment'])
  ]
};