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diff --git a/intl/icu_capi/js/package/lib/ICU4XLocale.d.ts b/intl/icu_capi/js/package/lib/ICU4XLocale.d.ts
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index 0000000000..b18b577302
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+++ b/intl/icu_capi/js/package/lib/ICU4XLocale.d.ts
@@ -0,0 +1,159 @@
+import { FFIError } from "./diplomat-runtime"
+import { ICU4XError } from "./ICU4XError";
+import { ICU4XOrdering } from "./ICU4XOrdering";
+
+/**
+
+ * An ICU4X Locale, capable of representing strings like `"en-US"`.
+
+ * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html Rust documentation for `Locale`} for more information.
+ */
+export class ICU4XLocale {
+
+  /**
+
+   * Construct an {@link ICU4XLocale `ICU4XLocale`} from an locale identifier.
+
+   * This will run the complete locale parsing algorithm. If code size and performance are critical and the locale is of a known shape (such as `aa-BB`) use `create_und`, `set_language`, `set_script`, and `set_region`.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.try_from_bytes Rust documentation for `try_from_bytes`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_from_string(name: string): ICU4XLocale | never;
+
+  /**
+
+   * Construct a default undefined {@link ICU4XLocale `ICU4XLocale`} "und".
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#associatedconstant.UND Rust documentation for `UND`} for more information.
+   */
+  static create_und(): ICU4XLocale;
+
+  /**
+
+   * Clones the {@link ICU4XLocale `ICU4XLocale`}.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html Rust documentation for `Locale`} for more information.
+   */
+  clone(): ICU4XLocale;
+
+  /**
+
+   * Write a string representation of the `LanguageIdentifier` part of {@link ICU4XLocale `ICU4XLocale`} to `write`.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#structfield.id Rust documentation for `id`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  basename(): string | never;
+
+  /**
+
+   * Write a string representation of the unicode extension to `write`
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#structfield.extensions Rust documentation for `extensions`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  get_unicode_extension(bytes: string): string | never;
+
+  /**
+
+   * Write a string representation of {@link ICU4XLocale `ICU4XLocale`} language to `write`
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#structfield.id Rust documentation for `id`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  language(): string | never;
+
+  /**
+
+   * Set the language part of the {@link ICU4XLocale `ICU4XLocale`}.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.try_from_bytes Rust documentation for `try_from_bytes`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  set_language(bytes: string): void | never;
+
+  /**
+
+   * Write a string representation of {@link ICU4XLocale `ICU4XLocale`} region to `write`
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#structfield.id Rust documentation for `id`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  region(): string | never;
+
+  /**
+
+   * Set the region part of the {@link ICU4XLocale `ICU4XLocale`}.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.try_from_bytes Rust documentation for `try_from_bytes`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  set_region(bytes: string): void | never;
+
+  /**
+
+   * Write a string representation of {@link ICU4XLocale `ICU4XLocale`} script to `write`
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#structfield.id Rust documentation for `id`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  script(): string | never;
+
+  /**
+
+   * Set the script part of the {@link ICU4XLocale `ICU4XLocale`}. Pass an empty string to remove the script.
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.try_from_bytes Rust documentation for `try_from_bytes`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  set_script(bytes: string): void | never;
+
+  /**
+
+   * Best effort locale canonicalizer that doesn't need any data
+
+   * Use ICU4XLocaleCanonicalizer for better control and functionality
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.canonicalize Rust documentation for `canonicalize`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static canonicalize(bytes: string): string | never;
+
+  /**
+
+   * Write a string representation of {@link ICU4XLocale `ICU4XLocale`} to `write`
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.write_to Rust documentation for `write_to`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  to_string(): string | never;
+
+  /**
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.normalizing_eq Rust documentation for `normalizing_eq`} for more information.
+   */
+  normalizing_eq(other: string): boolean;
+
+  /**
+
+   * See the {@link https://docs.rs/icu/latest/icu/locid/struct.Locale.html#method.strict_cmp Rust documentation for `strict_cmp`} for more information.
+   */
+  strict_cmp(other: string): ICU4XOrdering;
+
+  /**
+
+   * Deprecated
+
+   * Use `create_from_string("en").
+   */
+  static create_en(): ICU4XLocale;
+
+  /**
+
+   * Deprecated
+
+   * Use `create_from_string("bn").
+   */
+  static create_bn(): ICU4XLocale;
+}