build(deps): bump uniffi from 0.29.4 to 0.30.0

[dependabot]

Bumps uniffi from 0.29.4 to 0.30.0.

Changelog

Sourced from uniffi's changelog.

v0.30.0 (backend crates: v0.30.0) - (2025-10-08)

⚠️ Breaking Changes ⚠️

• UDL-based trait interfaces must now be wrapped with the #[uniffi::trait_interface] attribute.
• Python: Trait interface implementations must now inherit from the trait base class. This will look like class PyTraitName(RustTraitName):

What's new?

• All user-defined types can now be renamed with the proc-macro name = "NewName" attribute (like already supported for methods and constructors) (#2661)
• Enums and Records support exporting uniffi traits (ie, Display, Hash, Eq etc) (#2555)
• Support for exporting the Ord trait, allowing objects to be ordered by Rust (#2583).
• #[uniffi(default)] literals are now optional - eg, #[uniffi(default)] and #[uniffi(default = 0)] are equivalent. Similarly for args; #[uniffi::export(default(arg_name))]. When no literal is specifed, named types (objects, records, etc) can be used as long as they have suitable default values. (#2543). Custom types too (#2603)
• Custom enum and object types can be used as error type (#2658)
• Objects can implement external traits (#2430)
• Fix for external errors when error only used externally (#2641)
• Kotlin:
  • Switch to JNA direct mapping (#2229)
  • Support throwing external error (#2629)
  • The NoPointer placeholder object used to create fake interface instances has been renamed to NoHandle
• Python:
  • Improved how default values are handled in function signatures etc and more canonical use of Python dataclasses, all towards making mypy happier (#2552)
  • Methods now have typing annotations for return values (#2625)
  • Fix relative imports (#2657)
  • Fix shadowing param names with internal variables in Python (#2628/#2645)
  • Don't allow objects to be passed as arguments when traits are expected (#2649)
• Swift:
  • All object protocol conformances are public (#2671)
  • Initialization functions now have a stable ordering when using external types. This makes the generated source files deterministic.

⚠️ Breaking Changes for external bindings authors ⚠️

• uniffi_bindgen::backend has been removed.
• #[uniffi(default)] changes how defaults are represented.
• FfiType::RustArcPtr has been removed and the FFI type for objects/interfaces is now a u64. Bindings authors will need to update their code to reflect this:
  • Lowering/lifting now uses u64 values
  • The free function inputs a u64 handle rather than a raw pointer
  • The clone function inputs and returns a u64 handle rather than a raw pointer
• Enums and Records can have methods, so the Method now carries self_type instead of the object name. In the templates, for Callable.takes_self() is replaced with Callable.self_type().
• Trait / Callback interface changes
  • VTable fields are now: free, clone, followed by a field for each interface method. Note That free is now at the start of the vtable rather than the end.
  • Trait interface changes:

... (truncated)

Commits

• 47cb437 chore: Release
• 8b78601 chore: Release
• dd2200e Python: improve default values and use dataclasses to keep mypy happy. (#2552)
• d15c779 Throw error when objects are passed instead of traits (#2649)
• eaed3b8 callables should only go through the pipeline once
• 15738c7 Better FFI tracing
• 2a311d2 Remove RustBufferByReference
• 6bb25bd Kotlin: Pass explicit T::class.java to Native.register (#2678)
• 731ba33 Python: Fix async functions that return external types (#2659)
• 159006b CHANGELOG tweaks. (#2677)
• Additional commits viewable in compare view

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