Building Dual ESM and CJS Bundles with Rollup's Multi‑Output
Learn how Rollup's multi‑output lets you build ES module and CommonJS bundles from a single input, with a worked example, trade‑offs, and verification steps.
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rollupSwiper v9+ ESM‑only Core vs swiper/react Wrapper: CJS Interop and React 18 StrictMode Double‑Init
Integration Boundary Swiper v9+ ships as an ES‑module only distribution, removing the CommonJS/UMD entry points that v8 and earlier exposed. The swiper/react wrapper, which has existed since v8, is itself an ES module and therefore inherits the same constraint. This change forces toolchains that default to CommonJS – such as Jest’s default configuration or o
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