webpack4下webpack-dev-server熱更新緩慢問題【已解決：webpack4 mode設置出現問題】

  webpack4下有production(生產)和development（開發）兩種模式，若不設置，則會在終端下warn個不停。css   warn內容以下：webpack The ‘mode’ option has not been set. Set ‘mode’ option to ‘development’ or ‘production’ to enable defaults for t

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