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diff --git a/intl/icu_capi/js/package/lib/ICU4XWordSegmenter.d.ts b/intl/icu_capi/js/package/lib/ICU4XWordSegmenter.d.ts
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+++ b/intl/icu_capi/js/package/lib/ICU4XWordSegmenter.d.ts
@@ -0,0 +1,70 @@
+import { FFIError } from "./diplomat-runtime"
+import { ICU4XDataProvider } from "./ICU4XDataProvider";
+import { ICU4XError } from "./ICU4XError";
+import { ICU4XWordBreakIteratorLatin1 } from "./ICU4XWordBreakIteratorLatin1";
+import { ICU4XWordBreakIteratorUtf16 } from "./ICU4XWordBreakIteratorUtf16";
+import { ICU4XWordBreakIteratorUtf8 } from "./ICU4XWordBreakIteratorUtf8";
+
+/**
+
+ * An ICU4X word-break segmenter, capable of finding word breakpoints in strings.
+
+ * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html Rust documentation for `WordSegmenter`} for more information.
+ */
+export class ICU4XWordSegmenter {
+
+  /**
+
+   * Construct an {@link ICU4XWordSegmenter `ICU4XWordSegmenter`} with automatically selecting the best available LSTM or dictionary payload data.
+
+   * Note: currently, it uses dictionary for Chinese and Japanese, and LSTM for Burmese, Khmer, Lao, and Thai.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.new_auto Rust documentation for `new_auto`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_auto(provider: ICU4XDataProvider): ICU4XWordSegmenter | never;
+
+  /**
+
+   * Construct an {@link ICU4XWordSegmenter `ICU4XWordSegmenter`} with LSTM payload data for Burmese, Khmer, Lao, and Thai.
+
+   * Warning: {@link ICU4XWordSegmenter `ICU4XWordSegmenter`} created by this function doesn't handle Chinese or Japanese.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.new_lstm Rust documentation for `new_lstm`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_lstm(provider: ICU4XDataProvider): ICU4XWordSegmenter | never;
+
+  /**
+
+   * Construct an {@link ICU4XWordSegmenter `ICU4XWordSegmenter`} with dictionary payload data for Chinese, Japanese, Burmese, Khmer, Lao, and Thai.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.new_dictionary Rust documentation for `new_dictionary`} for more information.
+   * @throws {@link FFIError}<{@link ICU4XError}>
+   */
+  static create_dictionary(provider: ICU4XDataProvider): ICU4XWordSegmenter | never;
+
+  /**
+
+   * Segments a (potentially ill-formed) UTF-8 string.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.segment_utf8 Rust documentation for `segment_utf8`} for more information.
+   */
+  segment_utf8(input: string): ICU4XWordBreakIteratorUtf8;
+
+  /**
+
+   * Segments a UTF-16 string.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.segment_utf16 Rust documentation for `segment_utf16`} for more information.
+   */
+  segment_utf16(input: Uint16Array): ICU4XWordBreakIteratorUtf16;
+
+  /**
+
+   * Segments a Latin-1 string.
+
+   * See the {@link https://docs.rs/icu/latest/icu/segmenter/struct.WordSegmenter.html#method.segment_latin1 Rust documentation for `segment_latin1`} for more information.
+   */
+  segment_latin1(input: Uint8Array): ICU4XWordBreakIteratorLatin1;
+}