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Single-SPA with Webpack

In this lesson you will learn with webpack in single-spa, why it matters within build configuration, and how to use it correctly with clear, copy-ready examples.

with Webpack Overview

with Webpack lets you structure single-spa work so it stays readable, testable, and easy to scale. Instead of ad-hoc code, you follow a clear pattern that other developers can recognise immediately.

The key is to keep with webpack focused and predictable. Start from the minimal example here, then layer in only the complexity your feature actually needs.

import { registerApplication, start } from 'single-spa';

registerApplication({
  name: '@org/app',
  app: () => System.import('@org/app'),
  activeWhen: ['/app'],
});

start();

single-spa orchestrates multiple framework apps on one page through a root config.

with Webpack Example

registerApplication({
  name: '@org/app',
  app: () => System.import('@org/app'),
  activeWhen: ['/app'],
});
start();
  • Start from a minimal with Webpack example and grow it only as needed.
  • Keep configuration explicit so with Webpack behaves the same in every environment.
  • Name things clearly so teammates understand your with Webpack at a glance.
  • Add tests around with Webpack early to lock in expected behaviour.

Single-SPA Cheatsheet

Core single-spa APIs related to with webpack.

API Example Purpose
registerApplication registerApplication({ name, app, activeWhen }) Register a micro frontend
activeWhen activeWhen: ['/checkout'] Route ownership
start start() Begin routing
bootstrap export async function bootstrap() One-time setup
mount export async function mount(props) Render the app
unmount export async function unmount(props) Clean up the app
import map systemjs-importmap Locate app bundles

How with Webpack Works in Single-SPA

with Webpack is part of how single-spa lets multiple applications — even in different frameworks — coexist on one page. A root config registers each app and controls when it is active.

single-spa orchestrates multiple framework apps on one page through a root config.

  • A root config registers apps and calls start().
  • Each app exports bootstrap, mount, and unmount lifecycles.
  • activeWhen decides which routes each app owns.
  • Import maps resolve each app's bundle at runtime.

Practical Guidance for with Webpack

For reliable micro frontends, with webpack should isolate failures and keep shared state minimal. Let each team own its app end to end while agreeing on a few shared contracts.

Concern Recommendation
Isolation One app's crash should not break others
Shared state Prefer shared utility modules over globals
Routing Keep activeWhen rules explicit and non-overlapping
Deployment Release via import-map updates per app

Common Mistakes

  • Copying with webpack snippets without understanding what each line does.
  • Skipping error handling and edge cases when wiring up with webpack.
  • Leaving with webpack untested, so regressions slip into production.
  • Over-engineering with webpack before you actually need the extra flexibility.

Key Takeaways

  • with Webpack is a core part of working effectively with single-spa.
  • Start small and keep with webpack focused on a single responsibility.
  • Apply consistent patterns so with webpack scales across your project.
  • Test and document with webpack to keep it maintainable over time.

Pro Tip

When you get stuck on with webpack, reduce it to the smallest reproducible example first — most single-spa issues become obvious once the noise is gone.