Configuration

The generated Swift module can be configured using a uniffi.toml configuration file.

Available options

The configurations prefixed with experimental_ should be regarded as unstable and more likely to change than other configurations.

Configuration name	Default	Description
`cdylib_name`	`uniffi_{namespace}`[^1]	The name of the compiled Rust library containing the FFI implementation (not needed when using `generate --library`).
`module_name`	`{namespace}`[^1]	The name of the Swift module containing the high-level foreign-language bindings.
`ffi_module_name`	`{module_name}FFI`	The name of the lower-level C module containing the FFI declarations.
`ffi_module_filename`	`{ffi_module_name}`	The filename stem for the lower-level C module containing the FFI declarations.
`generate_module_map`	`true`	Whether to generate a `.modulemap` file for the lower-level C module with FFI declarations.
`omit_argument_labels`	`false`	Whether to omit argument labels in Swift function definitions.
`generate_immutable_records`	`false`	Whether to generate records with immutable fields (`let` instead of `var`).
`experimental_sendable_value_types`	`false`	Whether to mark value types as `Sendable'.
`custom_types`		A map which controls how custom types are exposed to Swift. See the custom types section of the manual

[^1]: namespace is the top-level namespace from your UDL file.

[bindings.swift]
cdylib_name = "mycrate_ffi"
omit_argument_labels = true