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+``fallbacker::ffi``
+===================
+
+.. js:class:: ICU4XLocaleFallbackConfig
+
+    Collection of configurations for the ICU4X fallback algorithm.
+
+    See the `Rust documentation for LocaleFallbackConfig <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbackConfig.html>`__ for more information.
+
+
+    .. js:attribute:: priority
+
+        Choice of priority mode.
+
+
+    .. js:attribute:: extension_key
+
+        An empty string is considered ``None``.
+
+
+    .. js:attribute:: fallback_supplement
+
+        Fallback supplement data key to customize fallback rules.
+
+
+.. js:class:: ICU4XLocaleFallbackIterator
+
+    An iterator over the locale under fallback.
+
+    See the `Rust documentation for LocaleFallbackIterator <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbackIterator.html>`__ for more information.
+
+
+    .. js:method:: get()
+
+        Gets a snapshot of the current state of the locale.
+
+        See the `Rust documentation for get <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbackIterator.html#method.get>`__ for more information.
+
+
+    .. js:method:: step()
+
+        Performs one step of the fallback algorithm, mutating the locale.
+
+        See the `Rust documentation for step <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbackIterator.html#method.step>`__ for more information.
+
+
+.. js:class:: ICU4XLocaleFallbackPriority
+
+    Priority mode for the ICU4X fallback algorithm.
+
+    See the `Rust documentation for LocaleFallbackPriority <https://docs.rs/icu/latest/icu/locid_transform/fallback/enum.LocaleFallbackPriority.html>`__ for more information.
+
+
+.. js:class:: ICU4XLocaleFallbackSupplement
+
+    What additional data is required to load when performing fallback.
+
+    See the `Rust documentation for LocaleFallbackSupplement <https://docs.rs/icu/latest/icu/locid_transform/fallback/enum.LocaleFallbackSupplement.html>`__ for more information.
+
+
+.. js:class:: ICU4XLocaleFallbacker
+
+    An object that runs the ICU4X locale fallback algorithm.
+
+    See the `Rust documentation for LocaleFallbacker <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html>`__ for more information.
+
+
+    .. js:function:: create(provider)
+
+        Creates a new ``ICU4XLocaleFallbacker`` from a data provider.
+
+        See the `Rust documentation for new <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html#method.new>`__ for more information.
+
+
+    .. js:function:: create_without_data()
+
+        Creates a new ``ICU4XLocaleFallbacker`` without data for limited functionality.
+
+        See the `Rust documentation for new_without_data <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html#method.new_without_data>`__ for more information.
+
+
+    .. js:method:: for_config(config)
+
+        Associates this ``ICU4XLocaleFallbacker`` with configuration options.
+
+        See the `Rust documentation for for_config <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html#method.for_config>`__ for more information.
+
+
+.. js:class:: ICU4XLocaleFallbackerWithConfig
+
+    An object that runs the ICU4X locale fallback algorithm with specific configurations.
+
+    See the `Rust documentation for LocaleFallbacker <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html>`__ for more information.
+
+    See the `Rust documentation for LocaleFallbackerWithConfig <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbackerWithConfig.html>`__ for more information.
+
+
+    .. js:method:: fallback_for_locale(locale)
+
+        Creates an iterator from a locale with each step of fallback.
+
+        See the `Rust documentation for fallback_for <https://docs.rs/icu/latest/icu/locid_transform/fallback/struct.LocaleFallbacker.html#method.fallback_for>`__ for more information.
+