test(e2e): add test case for constant inlining optimization (#6044)

Author: chenjiahan

e2e/cases/optimization/inline-const/index.test.ts

@@ -0,0 +1,32 @@
+import { build, dev, rspackOnlyTest } from '@e2e/helper';
+import { expect, test } from '@playwright/test';
+
+rspackOnlyTest(
+  'should inline the constants in production mode',
+  async ({ page }) => {
+    const rsbuild = await build({
+      cwd: __dirname,
+      page,
+    });
+    expect(await page.evaluate(() => window.test1)).toBe('Fish fish, Cat cat');
+    expect(await page.evaluate(() => window.test2)).toBe('Fish FISH, Cat CAT');
+
+    const indexJs = await rsbuild.getIndexBundle();
+    expect(indexJs).toContain('window.test1="Fish fish, Cat cat"');
+    expect(indexJs).toContain('window.test2="Fish FISH, Cat CAT"');
+
+    await rsbuild.close();
+  },
+);
+
+test('should import the constants as expected in development mode', async ({
+  page,
+}) => {
+  const rsbuild = await dev({
+    cwd: __dirname,
+    page,
+  });
+  expect(await page.evaluate(() => window.test1)).toBe('Fish fish, Cat cat');
+  expect(await page.evaluate(() => window.test2)).toBe('Fish FISH, Cat CAT');
+  await rsbuild.close();
+});

e2e/cases/optimization/inline-const/src/constants.ts

@@ -0,0 +1,2 @@
+export const FISH = 'fish';
+export const CAT = 'cat';

e2e/cases/optimization/inline-const/src/index.ts

@@ -0,0 +1,11 @@
+import { CAT, FISH } from './constants';
+
+declare global {
+  interface Window {
+    test1: string;
+    test2: string;
+  }
+}
+
+window.test1 = `Fish ${FISH}, Cat ${CAT}`;
+window.test2 = `Fish ${FISH.toUpperCase()}, Cat ${CAT.toUpperCase()}`;

e2e/cases/optimization/inline-const/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "extends": "@rsbuild/config/tsconfig",
+  "compilerOptions": {
+    "outDir": "./dist"
+  },
+  "include": ["src", "*.test.ts"]
+}