2 files changed, 19 insertions, 1 deletions

diff --git a/src/gleam_stdlib.mjs b/src/gleam_stdlib.mjs
index cdbb91a..0a3aef2 100644
--- a/src/gleam_stdlib.mjs
+++ b/src/gleam_stdlib.mjs
@@ -94,8 +94,14 @@ export function string_length(string) {
 }
 
 function graphemes_iterator(string) {
+  let env_locale = () => {
+    if (typeof navigator.language !== "undefined") {
+      return navigator.language;
+    }
+    return Intl.DateTimeFormat().resolvedOptions().locale;
+  };
   if (Intl && Intl.Segmenter) {
-    return new Intl.Segmenter("en-gb").segment(string)[Symbol.iterator]();
+    return new Intl.Segmenter(env_locale).segment(string)[Symbol.iterator]();
   }
 }
 
diff --git a/test/gleam/string_test.gleam b/test/gleam/string_test.gleam
index fafea89..ca986e8 100644
--- a/test/gleam/string_test.gleam
+++ b/test/gleam/string_test.gleam
@@ -379,6 +379,18 @@ pub fn to_graphemes_test() {
   |> string.to_graphemes
   |> should.equal(["뎌", "쉐"])
 
+  "👨‍👩‍👦‍👦"
+  |> string.to_graphemes()
+  |> should.equal(["👨‍👩‍👦‍👦"])
+
+  "ごん゙に゙ぢば"
+  |> string.to_graphemes()
+  |> should.equal(["ご", "ん゙", "に゙", "ぢ", "ば"])
+
+  "パピプペポ"
+  |> string.to_graphemes()
+  |> should.equal(["パ", "ピ", "プ", "ペ", "ポ"])
+
   "Z͑ͫ̓ͪ̂ͫ̽͏̴̙̤̞͉͚̯̞̠͍A̴̵̜̰͔ͫ͗͢L̠ͨͧͩ͘G̴̻͈͍͔̹̑͗̎̅͛́Ǫ̵̹̻̝̳͂̌̌͘!͖̬̰̙̗̿̋ͥͥ̂ͣ̐́́͜͞"
   |> string.to_graphemes
   |> should.equal([