In what cases are micro-frontends necessary and how do they differ?

Microfrontends are necessary when a project becomes too large and complex to support as a single monolithic application. This allows breaking down the frontend into independent parts that can be developed, tested, and deployed separately by different teams.

Main use cases of microfrontends:

• Large teams working in parallel on different parts of the interface.
• Different technologies or frameworks for different parts of the application.
• The need for independent release and scaling of individual modules.

Differences in microfrontends can be in the methods of integration:

• Web Components — using standard custom elements.
• iframes — isolated environment, but with interaction limitations.
• JavaScript integration — loading and rendering individual applications through a common container.

Each approach has its pros and cons regarding performance, isolation, and integration complexity.