One of the key features is the new "mode" option which lets you pick a set of "production" or "development" default settings: medium.com/webpack/webpack-4…
webpack 4: mode and optimization

webpack 4: mode and optimization

webpack adds a mode option. What does that mean?

medium.com
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Wait, I am not yet used to 3! Why you do this, JavaScript community :(
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For the casual observer, this is much more readable: medium.com/webpack/webpack-4…
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Importing wasm, wow
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