How we cut CKEditor's bundle size by 40%

a year ago

CKEditor 5's bundle size was reduced by 40% through tree-shaking and bundle size optimization techniques.
The optimization process involved analyzing and refactoring code to eliminate non-tree-shakable dependencies and side effects.
Key strategies included using /* #__PURE__ */ comments, updating compilation targets to ES2022, and leveraging the sideEffects flag in package.json.
The team introduced meta-packages to simplify installation and reduce duplicated modules, improving developer experience.
Continuous regression monitoring was implemented using tools like Sonda to prevent future bundle size increases.
Real-life testing showed significant improvements, with bundle sizes reduced by up to 42.7% across different bundlers like Vite, esbuild, and webpack.

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