Mode | webpack

Providing the mode configuration option tells webpack to use its built-in optimizations accordingly.
'none' | 'development' | 'production' = 'production'
Provide the mode option in the config:
or pass it as a CLI argument:
The following string values are supported:
If not set, webpack sets production as the default value for mode.
If mode is not provided via configuration or CLI, CLI will use any valid NODE_ENV value for mode.
mode doesn't do anything by itself — it picks the defaults of other options, each of which you can still set explicitly. These are the options whose default depends on it:
optimization.splitChunks is also tuned by mode: minSize, enforceSizeThreshold, maxAsyncRequests and maxInitialRequests are stricter in production. See SplitChunksPlugin for their values.
Two rows come with a condition: performance.hints only applies to browser targets, and devtool stays false in development when the build outputs an ES module library. With experiments.css enabled, development additionally defaults CSS assets to source-map.
mode: 'none' only opts out of the defaults listed here. Options that don't depend on the mode — such as optimization.providedExports or optimization.removeEmptyChunks — keep their usual defaults, and mode: 'none' is not the same as disabling every optimization.
If you want to change the behavior according to the mode variable inside the webpack.config.js, you have to export a function instead of an object:
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