fix(theme): make useHistorySelector() hydration-safe + use it read search/hash in theme#11263
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fix(theme): make useHistorySelector() hydration-safe + use it read search/hash in theme#11263
useHistorySelector() hydration-safe + use it read search/hash in theme#11263Conversation
slorber
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Argos
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Motivation
When building in dev mode
docusaurus build --devwe get a lot of React hydration errors as long as we use search/hash URL parameters:On http://localhost:3000/?param or http://localhost:3000/#hash we get:
This is because the theme uses
const {search, hash} = useLocation()to render UI elements, but unfortunately, this hook returns the current/immediate browser search/hash, which is different from what we use on the server (always empty due to our SSG nature).There's probably a way to configure React Router to output hydration-safe values when using
useLocation(), but I'm not 100% sure it's a good idea, it's more risky, and may lead to extra re-renders on things that do not care about search/hash.Instead I made
useHistorySelectorhydration-safe, ensuring that on hydration it always have empty/search like it does on the server.Test Plan
Deploy preview + local
This should fix warnings we get in Argos, and repair it because it was broken due to such new warning introduced due to an iframe embed in v3.8 blog post.
Test links
https://deploy-preview-11263--docusaurus-2.netlify.app/