feat(fx): add Transient provider option for non-cached constructors #1280
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Introduces a new fx.Transient() helper that allows constructors to be invoked each time their dependency is requested, rather than once at application start. This enables transient or per-request dependency lifetimes similar to scoped services in other DI systems. The Transient wrapper registers a factory function that produces a new instance on each call. Includes unit tests verifying: - Constructor runs multiple times for transient providers. - Singleton behavior remains unchanged for regular fx.Provide.
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Motivation
Currently, fx.Provide() always registers constructors as singletons, meaning their results are reused for the lifetime of the app.
In some cases, it’s desirable to have fresh instances, for example:
Introduces a new fx.Transient() helper that allows constructors to be invoked each time their dependency is requested, rather than once at application start.
This enables transient or per-request dependency lifetimes similar to scoped services in other DI systems. The Transient wrapper registers a factory function that produces a new instance on each call.
Includes unit tests verifying:
Backward compatibility
No breaking changes — existing Fx applications continue to behave identically.
The new feature is purely additive.
Documentation and usage examples will be added in a follow-up PR after this change is approved.