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Assess the Existing Salesforce Org

Before estimating the work, developers need to understand how the current components work and how they are connected to other parts of Salesforce. This enables them to plan the migration and identify possible problems in good time.

The assessment should identify all the parts of Aura, what each of the parts does and how it is used and the features the users need. Also, developers should verify how components integrate, how they share data and how they communicate events. When it loads, they can see which pages they use the most and what information is in the Lightning Usage app.

The team should review the tests that are available and identify the features that need to be functional. They want to know if LWC has the features and components that they need. Developers should also watch for custom JavaScript, dynamic component creation and legacy methods that may need to be changed during migration.

Choose a Component-by-Component or Larger Migration

Migrating component by component is often a good fit if the org has a lot of dependencies or the team wants to mitigate change risk. Developers are able to start with a relatively independent component, validate the new implementation and move to dependent components in a planned way.

If the components are a tight group and changing one part would lead to a more complex design than needed, then a bigger migration makes sense. However, a complete rewrite can increase the testing requirements and introduce more risk to the release.

The migration plan should detail the components being migrated, their dependencies, functionality required, testing responsibilities and rollback approach. It is contingent upon the existing architecture (not only on the number of components).

Manage Aura and LWC Interoperability

Aura and LWC can co-exist in the same runtime. You cannot put an Aura component inside a LWC component. You can put a LWC child inside an Aura component. This lets teams migrate to LWC piece by piece, but still use Aura wrappers for any supported feature that needs it.

Also, the developers should make the right mapping of the communication patterns. Aura app and component events don’t have a direct mapping to the same LWC patterns. The new implementation provides the option of custom DOM events or Lightning Message Service for inter-component communication, based on the use case.

LWC uses modules in the lightning/ namespace to import platform capabilities. For developers migrating, they need to find the right module and wire adapter for each need, rather than assuming every Aura API maps directly.

Address Common Migration Problems

Some Aura patterns demand more than a syntax change. Any direct references to $A, Aura-specific APIs, dynamically created components, event handling, and component interfaces may need to be re-designed. Developers need to map each pattern to an available LWC capability or retain an Aura wrapper as appropriate.

Security behaviour also requires attention. Salesforce also announced Lightning Web Security (LWS), a newer security architecture, while Lightning Locker remains relevant in orgs where it is enabled. Custom code and third-party libraries may be affected by variations in JavaScript isolation and the behaviour that is supported.