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ClojureScript's :advanced compilation can shrink a Reagent app from 180 KB to 45 KB gzipped, but only if you describe every external JavaScript dependency in externs files. This post shows the size gains, the externs pitfall, and a practical CI profile strategy.
Use ClojureScript :advanced compilation for smaller release bundles while protecting JavaScript APIs with externs and verifying every interop boundary before deploy.
Learn how to shrink ClojureScript output by turning on advanced compilation and letting the compiler infer externs, with a step‑by‑step Reagent example and verification tips.
Learn how ClojureScript's :advanced compilation shrinks production bundles through dead‑code elimination and symbol renaming, while keeping JavaScript interop reliable via :foreign-libs and careful export handling.
Dev build works, release build throws 'undefined is not a function'? Diagnose ClojureScript :advanced compilation property renaming with pseudo-names, externs, and goog.object fixes.
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