Modul Singleton dan Pemberian Versi
Pahami cara memastikan hanya satu instans modul yang dimuat dan mengelola konflik versi.
Modul Singleton dan Pemberian Versi adalah pelajaran Micro Frontends Architecture with Module Federation gratis di CoddyKit. Ini adalah pelajaran 2 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Micro Frontends Architecture with Module Federation, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Micro Frontends Architecture with Module Federation mencakup 4 pelajaran total.
Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.
What are Singleton Modules?
In Micro Frontend architectures, a singleton module is a piece of code or a library that should only ever exist as a single instance across your entire application, even if multiple Micro Frontends try to load it.
Think of it as a unique resource that all parts of your system need to share consistently.
- Ensures a single source of truth.
- Prevents conflicting states or behaviors.
Why Singletons Matter for MFEs
Imagine multiple Micro Frontends (MFEs) all loading their own copy of a UI library like React, or a state management library like Redux.
Without singletons, you could end up with:
- Multiple instances of React Context, breaking component communication.
- Separate Redux stores, leading to inconsistent application state.
- Increased bundle size due to duplicate code.
Singletons solve these issues by guaranteeing a unified dependency.
Implementing Singletons with MF
Module Federation makes it easy to declare shared modules as singletons using the singleton: true option in your Webpack configuration.
When this is set, Webpack ensures that only one version of the specified module is loaded and used by all federated applications (hosts and remotes) at runtime.
Code: Configuring a Singleton
Here's how you'd configure a shared module, like react, to be a singleton in your webpack.config.js:
const { ModuleFederationPlugin } = require('webpack').container;
module.exports = {
// ... other Webpack config
plugins: [
new ModuleFederationPlugin({
name: 'host_app',
remotes: {},
shared: {
react: {
singleton: true, // Only one React instance allowed
requiredVersion: '^18.0.0',
},
'react-dom': {
singleton: true, // Only one ReactDOM instance allowed
requiredVersion: '^18.0.0',
},
},
}),
],
};Understanding Shared Module Versioning
Beyond ensuring a single *instance* (singleton), you also need to manage which *version* of a shared module gets loaded.
What if one MFE needs React v17 and another needs React v18? Module Federation has mechanisms to handle these version conflicts and ensure compatibility or gracefully fail.
`requiredVersion` for Specificity
The requiredVersion option in the shared configuration allows you to specify the semantic version (semver) range that your application expects for a shared module.
Webpack will try to find a compatible version among the host and remote applications. If a compatible version is found, it's used. If not, it might load a fallback or throw an error, depending on other settings.
Code: Specifying Required Versions
Here's how you might define a requiredVersion for a shared library:
const { ModuleFederationPlugin } = require('webpack').container;
module.exports = {
// ...
plugins: [
new ModuleFederationPlugin({
// ...
shared: {
lodash: {
singleton: false,
requiredVersion: '^4.17.21', // Any version compatible with 4.17.21
},
moment: {
singleton: true,
requiredVersion: '2.29.1', // Exactly version 2.29.1
},
},
}),
],
};`strictVersion: true` for Strictness
While requiredVersion guides version selection, strictVersion: true enforces it rigorously.
If strictVersion: true is enabled and a remote module requests a version that is incompatible with the host's requiredVersion (or the version already loaded), Module Federation will throw an error and prevent the application from loading. This prevents unexpected behavior from version mismatches.
Code: Enforcing Strict Versioning
Combining singleton, requiredVersion, and strictVersion for critical dependencies:
const { ModuleFederationPlugin } = require('webpack').container;
module.exports = {
// ...
plugins: [
new ModuleFederationPlugin({
// ...
shared: {
react: {
singleton: true,
requiredVersion: '^18.0.0',
strictVersion: true, // Fail if versions are incompatible
},
// ... other shared modules
},
}),
],
};Best Practices for Shared Dependencies
To effectively manage singleton modules and versioning:
- Use Semantic Versioning (SemVer): Adhere to major.minor.patch for all shared modules.
- Communicate: Ensure teams are aware of shared module updates and version requirements.
- Test Compatibility: Regularly test your federated applications to ensure shared modules work across all remotes and hosts.
- Be Strategic: Not all shared modules need to be singletons or have strict versioning. Apply these settings thoughtfully based on the module's criticality.
Quick Check: Singleton & Versioning
When configuring shared modules in Module Federation, what are the primary benefits of using singleton: true and strictVersion: true?
Recap & Next Steps
You've now learned about singleton modules and versioning in Module Federation!
- Singleton modules ensure only one instance of a shared dependency exists across your federated application, crucial for stateful libraries.
- The
requiredVersionandstrictVersionoptions help manage compatibility and prevent issues arising from conflicting module versions.
These techniques are vital for building robust and predictable Micro Frontend applications.
Pertanyaan yang Sering Diajukan
Apakah pelajaran “Modul Singleton dan Pemberian Versi” gratis?
Ya — teks lengkap “Modul Singleton dan Pemberian Versi” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Micro Frontends Architecture with Module Federation, upgrade ke CoddyKit PRO. Kursus Micro Frontends Architecture with Module Federation mencakup 4 pelajaran total.
Apa yang akan aku pelajari di “Modul Singleton dan Pemberian Versi”?
Pahami cara memastikan hanya satu instans modul yang dimuat dan mengelola konflik versi. Kamu berlatih Micro Frontends Architecture with Module Federation dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.
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Semua pelajaran dalam kursus ini
- Menggunakan Dependensi Bersama
- Modul Singleton dan Pemberian Versi
- Pemuatan Modul Dinamis
- Berbagi Status dan Utilitas di Seluruh Remote