fix(editor): Fix getInitials when Intl.Segmenter is not supported (#11103)

packages/design-system/src/utils/labelUtil.spec.ts

@@ -1,3 +1,5 @@
+import type { MockInstance } from 'vitest';
+
 import { getInitials } from './labelUtil';
 
 describe('labelUtil.getInitials', () => {
@@ -26,4 +28,29 @@ describe('labelUtil.getInitials', () => {
 	])('turns "%s" into "%s"', (input, output) => {
 		expect(getInitials(input)).toBe(output);
 	});
+
+	describe('when Intl.Segmenter is not supported', () => {
+		let intlSpy: MockInstance;
+
+		beforeEach(() => {
+			// No Intl.Segmenter support
+			intlSpy = vi.spyOn(globalThis, 'Intl', 'get');
+			intlSpy.mockImplementation(() => ({}));
+		});
+
+		it.each([
+			['', ''],
+
+			// simple words
+			['Hello', 'He'],
+			['Hello World', 'HW'],
+			['H', 'H'],
+
+			// multiple spaces
+			['Double  Space', 'DS'],
+			['        ', ''],
+		])('turns "%s" into "%s"', (input, output) => {
+			expect(getInitials(input)).toBe(output);
+		});
+	});
 });

packages/design-system/src/utils/labelUtil.ts

@@ -1,25 +1,19 @@
 export const getInitials = (label: string): string => {
-	const words = label
-		.split(' ')
-		.filter((word) => word !== '')
-		.map((word) => [...new Intl.Segmenter().segment(word)]);
+	const isSegmenterSupported = typeof Intl !== 'undefined' && 'Segmenter' in Intl;
 
-	if (words.length === 0) {
-		return '';
-	} else if (words.length === 1) {
-		// first two segments of the first word
-		return (
-			words
-				.at(0)
-				?.slice(0, 2)
-				.map((grapheme) => grapheme.segment)
-				.join('') ?? ''
-		);
-	} else {
-		// first segment ok the first two words
-		return words
-			.slice(0, 2)
-			.map((word) => word.at(0)?.segment ?? '')
-			.join('');
+	const segmentWord = (word: string): string[] => {
+		if (isSegmenterSupported) {
+			return [...new Intl.Segmenter().segment(word)].map((s) => s.segment);
 		}
+		return word.split('');
+	};
+
+	const getFirstSegment = (word: string[]): string => word[0] || '';
+	const getFirstTwoSegments = (word: string[]): string => word.slice(0, 2).join('');
+
+	const words = label.split(' ').filter(Boolean).map(segmentWord);
+
+	if (words.length === 0) return '';
+	if (words.length === 1) return getFirstTwoSegments(words[0]);
+	return words.slice(0, 2).map(getFirstSegment).join('');
 };