Fix toast ESM build and SSR support #4124
Merged
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This fixes two issues using Toast in Next.js
use-sync-external-store
doesn't have package.json exports, so it doesn't work in ESM. I filed a PR here to fix it Add package.json exports for use-sync-external-store facebook/react#26230 but for now we can import explicitly fromuse-sync-external-store/shim/index.js
.useSyncExternalStore
has an "optional" third argument calledgetServerSnapshot
which isn't really optional because it errors if it isn't provided on the server. So now I have implemented it. Also added SSR tests to catch this.