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diff --git a/intl/icu_capi/js/package/lib/ICU4XDataProvider.d.ts b/intl/icu_capi/js/package/lib/ICU4XDataProvider.d.ts
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+++ b/intl/icu_capi/js/package/lib/ICU4XDataProvider.d.ts
@@ -0,0 +1,100 @@
+import { FFIError } from "./diplomat-runtime"
+import { ICU4XError } from "./ICU4XError";
+import { ICU4XLocaleFallbacker } from "./ICU4XLocaleFallbacker";
+
+/**
+
+ * An ICU4X data provider, capable of loading ICU4X data keys from some source.
+
+ * See the {@link https://docs.rs/icu_provider/latest/icu_provider/index.html Rust documentation for `icu_provider`} for more information.
+ */
+export class ICU4XDataProvider {
+
+  /**
+
+   * Constructs an {@link ICU4XDataProvider `ICU4XDataProvider`} that uses compiled data.
+
+   * Requires the `compiled_data` feature.
+
+   * This provider cannot be modified or combined with other providers, so `enable_fallback`, `enabled_fallback_with`, `fork_by_locale`, and `fork_by_key` will return `Err`s.
+   */
+  static create_compiled(): ICU4XDataProvider;
+
+  /**
+
+   * Constructs an `FsDataProvider` and returns it as an {@link ICU4XDataProvider `ICU4XDataProvider`}. Requires the `provider_fs` Cargo feature. Not supported in WASM.
+
+   * See the {@link https://docs.rs/icu_provider_fs/latest/icu_provider_fs/struct.FsDataProvider.html Rust documentation for `FsDataProvider`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_fs(path: string): ICU4XDataProvider | never;
+
+  /**
+
+   * Deprecated
+
+   * Use `create_compiled()`.
+   */
+  static create_test(): ICU4XDataProvider;
+
+  /**
+
+   * Constructs a `BlobDataProvider` and returns it as an {@link ICU4XDataProvider `ICU4XDataProvider`}.
+
+   * See the {@link https://docs.rs/icu_provider_blob/latest/icu_provider_blob/struct.BlobDataProvider.html Rust documentation for `BlobDataProvider`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_from_byte_slice(blob: Uint8Array): ICU4XDataProvider | never;
+
+  /**
+
+   * Constructs an empty {@link ICU4XDataProvider `ICU4XDataProvider`}.
+
+   * See the {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/empty/struct.EmptyDataProvider.html Rust documentation for `EmptyDataProvider`} for more information.
+   */
+  static create_empty(): ICU4XDataProvider;
+
+  /**
+
+   * Creates a provider that tries the current provider and then, if the current provider doesn't support the data key, another provider `other`.
+
+   * This takes ownership of the `other` provider, leaving an empty provider in its place.
+
+   * The providers must be the same type (Any or Buffer). This condition is satisfied if both providers originate from the same constructor, such as `create_from_byte_slice` or `create_fs`. If the condition is not upheld, a runtime error occurs.
+
+   * See the {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fork/type.ForkByKeyProvider.html Rust documentation for `ForkByKeyProvider`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  fork_by_key(other: ICU4XDataProvider): void | never;
+
+  /**
+
+   * Same as `fork_by_key` but forks by locale instead of key.
+
+   * See the {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fork/predicates/struct.MissingLocalePredicate.html Rust documentation for `MissingLocalePredicate`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  fork_by_locale(other: ICU4XDataProvider): void | never;
+
+  /**
+
+   * Enables locale fallbacking for data requests made to this provider.
+
+   * Note that the test provider (from `create_test`) already has fallbacking enabled.
+
+   * See the {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fallback/struct.LocaleFallbackProvider.html#method.try_new Rust documentation for `try_new`} for more information.
+
+   * Additional information: {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fallback/struct.LocaleFallbackProvider.html 1}
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  enable_locale_fallback(): void | never;
+
+  /**
+
+   * See the {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fallback/struct.LocaleFallbackProvider.html#method.new_with_fallbacker Rust documentation for `new_with_fallbacker`} for more information.
+
+   * Additional information: {@link https://docs.rs/icu_provider_adapters/latest/icu_provider_adapters/fallback/struct.LocaleFallbackProvider.html 1}
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  enable_locale_fallback_with(fallbacker: ICU4XLocaleFallbacker): void | never;
+}