2691a66327
💡 What: Optimized `LanguageProvider` to use lazy state initialization for `language` and removed `isInitialized` state. 🎯 Why: The previous implementation triggered a second render on mount because it initialized state to 'de' and then updated it in a `useEffect`. 📊 Impact: Reduces initial render count of the entire application by 50% (from 2 to 1). 🔬 Measurement: Verified with `src/i18n/__tests__/initialRender.test.tsx` which confirms the render count is now 1. Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>
37 lines
1.1 KiB
TypeScript
37 lines
1.1 KiB
TypeScript
// @vitest-environment jsdom
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import { render, act } from '@testing-library/react';
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import { LanguageProvider, useTranslation } from '../index';
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import { describe, it, expect } from 'vitest';
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describe('LanguageProvider Initial Render', () => {
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it('should verify initial render count', async () => {
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let renderCount = 0;
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const Consumer = () => {
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useTranslation();
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renderCount++;
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return null;
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};
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render(
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<LanguageProvider>
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<Consumer />
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</LanguageProvider>
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);
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// Wait for any effects to run
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await act(async () => {
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await new Promise(resolve => setTimeout(resolve, 10));
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});
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// After optimization, renderCount should be 1.
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// Previously it was 2.
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expect(renderCount).toBe(1);
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// Verify lang attribute is set (getInitialLanguage defaults to 'de' in jsdom if window undefined,
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// but in jsdom window IS defined. navigator.language usually defaults to en-US in jsdom)
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// We just check it's set to something valid ('en' or 'de')
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expect(['en', 'de']).toContain(document.documentElement.lang);
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});
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});
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