The 'mode' option has not been set, webpack will fallback to 'production' for this value.絕對行，改不了來找我

在學習webpack的過程中，打包過程出現這個錯誤The ‘mode’ option has not been set, webpack will fallback to ‘production’ for this value.一開始我的命令是寫：webpack ./src/main.js ./dist/bundle.js 原因是webpack4.0以上版本更改了命令，要寫成webpack .\s

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