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 参考资料：https://medium.com/swlh/rules-of-micro-frontends-7b96c10dde9

This is an opinionated list of best practices when designing applications that follow the Micro-frontend pattern. Each “rule” should be examined and its benefits/downsides evaluated against your specific use case.

Zero coupling between Micro-frontends

To achieve the benefits of this architecture, accidental coupling should be avoided as much as possible; this will unlock the flexibility and scalability that the Micro-Frontend pattern has to offer as well as future-proofing your applications by allowing incremental upgrades or future complete rewrites of parts of your application.

Each Micro-frontend should be able to render in isolation or inside a container application. The data required should be loaded by each Micro-Frontend and avoid data waterfalls.

Do:

• ? Share libraries that can be swapped without affecting other Micro-frontends.
• ? Load all the data it needs to render.

Do Not:

• ? Have a centralised store/share data across different Micro-Frontends.
• ? Share libraries that are in active development.

Separate Code Bases

Each Micro-Frontend should have its own codebase and the version control of choice shouldn’t have any impact on the way the project is developed or deployed. Having all projects under a single monorepo or individual repositories is fine.

Do:

• ? Use Monorepos.
• ? Use individual repos.

Each Micro-frontend should be deployed independently

Each Micro-Frontend should have it’s own CI/CD pipeline and be able to deploy to production on demand without any dependencies on other Micro-frontends. A common antipattern that should be avoided is “The deployment queue of hell” where different Micro-frontends are so tightly coupled that they need to be deployed in a specific order to avoid breaking the application.

Do:

• ? Have separate CI/CD pipelines.
• ? Release on demand.

Do Not:

• ? Have Release schedules.
• ? Have incremental/sequential deployments that require previous versions.

Micro-Frontends should be tested Independently

Because Micro-Frontends are required to render independently as well as inside a container application, it makes sense to also test them independently using unit and integration tests for both scenarios.

Do:

• ? Have unit and integration tests for each Micro-Frontend rendering in isolation.
• ? Run integration tests for Micro-Frontends rendering inside the container applications as part of end-to-end testing.

Micro-Frontends should be versioned

When a new Micro-Fronted is deployed to production, the previous version should not be deleted and the new version should be tagged with a version number using semantic versioning or similar. It is up to the container applications to decide what specific version of a particular Micro-Frontend to use (Managed) or always use the latest version instead (Evergreen).

Do:

• ? Use Semantic versioning.
• ? Use a specific version or “latest”.

Do Not:

• ? Require a global deployment to change versions.
• ? Delete previous versions.

Minimal Communication

Communication between Micro-Frontends should be minimal and simple, avoiding global state and framework-specific solutions as much as possible.

If two or more Micro-Frontends are sharing a lot of messages to provide their minimal functionality, they might be too tightly coupled and they could share a similar enough purpose that they should be considered to be integrated into one.

Do:

• ? Keep messages small and simple.
• ? Avoid state and communication frameworks if possible.

Do Not:

• ? Share state.
• ? Have unnecessary communication.

CSS should be scoped

CSS from loaded from one Micro-fronted should not affect others.

Do:

• ? Scope your CSS.
• ? Use a CSS-in-JS or namespacing library (like CSS Modules).

Do Not:

• ? Use global CSS.

Final Recommendations

• ? Try to create autonomous teams.
• ? Try to arrange your Micro-Frontends around business functionality.
• ? Reusability is a nice “side effect” not the target.
• ? Don’t Force this architectural style just because it is “new”.
• ? You don’t need multiple javascript frameworks.
• ? You don’t need a “micro-frontend framework”.
• ? Micro-Frontends don’t have to be “micro”.

Rules of Micro-Frontends

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原文地址：https://www.cnblogs.com/rongfengliang/p/14224447.html