TypeError: can't access property "color"

Win10, both Expo targeting web & Next.js with React-Native-Web won't run your library. I used only the demo you have in README.
```error
Unhandled Runtime Error

TypeError: can't access property "color", topLevel is undefined
Call Stack
generateNewStylesheet/<
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/webpack/pages/index.970e49074bdcb60232d4.hot-update.js (24175:9)
generateNewStylesheet
/_next/static/webpack/pages/index.970e49074bdcb60232d4.hot-update.js (24174:30)
NativeSyntaxHighlighter
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/webpack/pages/index.970e49074bdcb60232d4.hot-update.js (24284:52)
renderWithHooks
/_next/static/chunks/main.js (31890:27)
mountIndeterminateComponent
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (34569:13)
beginWork
/_next/static/chunks/main.js (35683:16)
callCallback
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (17275:14)
invokeGuardedCallbackDev
/_next/static/chunks/main.js (17324:16)
invokeGuardedCallback
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (17379:31)
beginWork$1
/_next/static/chunks/main.js (40290:28)
performUnitOfWork
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (39241:12)
workLoopSync
/_next/static/chunks/main.js (39217:22)
performSyncWorkOnRoot
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (38843:9)
flushSyncCallbackQueueImpl/<
/_next/static/chunks/main.js (28176:24)
unstable_runWithPriority
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (46080:12)
runWithPriority$1
/_next/static/chunks/main.js (28126:10)
flushSyncCallbackQueueImpl
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (28171:24)
flushSyncCallbackQueue
/_next/static/chunks/main.js (28159:3)
flushSync
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/main.js (39019:5)
scheduleRefresh
/_next/static/chunks/main.js (28713:14)
performReactRefresh/<
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/react-refresh.js (507:17)
performReactRefresh
/_next/static/chunks/react-refresh.js (496:26)
scheduleUpdate/<
file:/D:/doc/prog/learn/js/react/reactnative/test-highlight-nextjs/.next/static/chunks/react-refresh.js (135:35)
```

Reproduce the failure using the README demo with Expo or Next.js and React-Native-Web on Windows 10. Start by tracing NativeSyntaxHighlighter and generateNewStylesheet from the reported stack, then verify the demo renders without the topLevel color TypeError.

Written by the indexing model from the issue text.