Uncaught ReferenceError: ref is not defined

根据引用和的内容，报错"Uncaught ReferenceError: ref is not defined"的解决方案是将webpack的版本从5.0.0降级到4.0.1。这个报错可能是因为webpack 5在默认情况下不再包含Node.js核心模块的polyfills导致的。降级webpack版本后，再运行npm install和npm start即可解决该问题。<span class="em">1</span><span class="em">2</span>
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