webpack 4: The most important update for Angular
summary
Webpack 4 promises concrete gains: sideEffects optimization lets package authors signal safe tree-shaking and turns a 223 KB library into ~3 KB in one example, and the reworked chunk graph plus caching and parallelism cuts rebuilds from hours to minutes (examples show ~9h to 17m, averages around 75% reduction, upper-cited ~98%). It adds WebAssembly first-class integration, first-class CSS/HTML modules, a new plugin API, mode presets and zero-config defaults that actually ship and run.
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