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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