feat: добавить entry-point для React-модуля

- добавлена генерация index.ts рядом с React-компонентом

- добавлен тест генерации directory import

- обновлена документация ожидаемого output

test/react-entry.test.mjs

@@ -0,0 +1,40 @@
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import os from 'node:os'
+import path from 'node:path'
+import test from 'node:test'
+
+import { generate } from '../dist/index.js'
+
+test('generates a React directory entry-point', async () => {
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'svg-sprites-react-entry-'))
+  const inputDir = path.join(root, 'icons')
+  const outputDir = path.join(root, 'public', 'sprites')
+  const reactDir = path.join(root, 'src', 'shared', 'ui', 'svg-sprite')
+
+  fs.mkdirSync(inputDir, { recursive: true })
+  fs.writeFileSync(
+    path.join(inputDir, 'check.svg'),
+    '<svg viewBox="0 0 16 16"><path d="M1 8l4 4L15 2" /></svg>',
+  )
+
+  await generate({
+    output: outputDir,
+    publicPath: '/sprites',
+    preview: false,
+    react: reactDir,
+    sprites: [
+      {
+        name: 'icons',
+        input: inputDir,
+      },
+    ],
+  })
+
+  const indexPath = path.join(reactDir, 'index.ts')
+  const index = fs.readFileSync(indexPath, 'utf-8')
+
+  assert.ok(fs.existsSync(indexPath))
+  assert.match(index, /export \{ SvgSprite \} from '\.\/svg-sprite'/)
+  assert.match(index, /SvgSpriteProps/)
+})