Make Svelte's <Deferred> not crash in an SSR environment #2396
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The <Deferred> component accesses `window`, which breaks SSR rendering of any pages that have <Deferred> components on them.
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The Deferred Svelte component calls
window.queueMicrotask. In SSR,windowis unavailable, leading to SSR throwing:In SSR,
<Deferred>props don't need to be rendered at all by definition, so the component should check ifwindowis available before scheduling the microtask.