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# icu_capi [](https://crates.io/crates/icu_capi)
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This crate contains the source of truth for the [Diplomat](https://github.com/rust-diplomat/diplomat)-generated
FFI bindings. This generates the C, C++, JavaScript, and TypeScript bindings. This crate also contains the `extern "C"`
FFI for ICU4X.
While the types in this crate are public, APIs from this crate are *not intended to be used from Rust*
and as such this crate may unpredictably change its Rust API across compatible semver versions. The `extern "C"` APIs exposed
by this crate, while not directly documented, are stable within the same major semver version, as are the bindings exposed under
the `cpp/` and `js/` folders.
This crate may still be explored for documentation on docs.rs, and there are language-specific docs available as well.
C++, Dart, and TypeScript headers contain inline documentation, which is available pre-rendered: [C++], [TypeScript].
This crate is `no_std`-compatible. If you wish to use it in `no_std` mode, you must write a wrapper crate that defines an allocator
and a panic hook in order to compile as a C library.
More information on using ICU4X from C++ can be found in [our tutorial].
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## More Information
For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).