Optimize Router.use() to map only the looked-up method entry

[coderabbitai]

Context

In the Router.use() method implementation, there's a TODO comment identifying a potential optimization:

While correct, it would be enough to map only the entry for the method that is actually looked up. However this is not easily achieved with the current implementation.

Currently, when applying a middleware transformation via use(), the implementation maps all HTTP method entries in the _RouterEntry, even though only one method is being looked up at a time. This works correctly but performs unnecessary transformations.

Proposed Optimization

Modify the implementation to apply the mapping function only to the specific method entry being looked up, rather than transforming all method entries upfront.

References

• PR: feat(router): Add support for setting up mappings of values on lookup router.use(path, map) #186
• Comment: feat(router): Add support for setting up mappings of values on lookup router.use(path, map) #186 (comment)
• File: lib/src/router/router.dart (lines 67-69)

Requested by: @nielsenko