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docs(examples/{lit,preact}): rewrite the lit basic, pagination and SSR demos to match the other adapters, and insert the SSR output with replacement callbacks - #12594
Rewrite the Lit basic, pagination and ssr examples, which were e2e demos (custom servers, port config, failure-injection endpoints, data-testids, multiple pages), to match the same examples of the other adapters:
basic: a list of posts and a post detail view from JSONPlaceholder, with visited posts marked from the query cache, like the other basic examples and Lit basic-graphql-request. Removes the todos demo pages (basic-query.html, mutation.html, lifecycle-contract.html).
pagination: an MSW handler in src/mocks.ts instead of the custom Node API server and scripts/dev.mjs. projectsQueries.list(page) is read with createQueryController and placeholderData: keepPreviousData, and the next page is prefetched in updated(), like Preact pagination.
ssr: the Vite SSR layout of Preact ssr (server.js with Express and Vite middleware mode, src/entry-server.ts, src/entry-client.ts), keeping Lit SSR with @lit-labs/ssr, lit-element-hydrate-support.js and the explicit queryClient property. The server prefetches the posts and the first post's author and dehydrates them with devalue, and the comments are fetched on the client only.
In the server.js of Lit ssr and Preact ssr, insert the rendered HTML and state with replacement callbacks, so $' and other replacement patterns in the data are kept as is instead of breaking the inline script.
Drop the pagehide unmount from Lit ssr and the Lit SSR guide. Unmounting on pagehide removes the focus and reconnect subscriptions when the page is kept in the back/forward cache, and the other adapters' SSR examples don't unmount.
Remove the stale CHANGELOG.md files and the config/, scripts/ and server/ folders, and give each example a README like the other examples.
Update the examples section of the lit-query README, dropping the removed port and environment variables.
Update the snippets of the Lit SSR guide to the new example code, and note that controllers rendered on the server should get options objects rather than option getters, since a getter is first read on a host update, which Lit SSR doesn't run.
Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.
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Walkthrough
The PR replaces the basic and pagination Lit examples and restructures the Lit SSR example and guide. It adds posts-based queries to the basic example, a mocked paginated API to the pagination example, and separate server prefetch, render, and client hydration steps to the SSR example. The Preact SSR server also changes how it replaces HTML and state placeholders.
Changes: Basic Lit example
Layer / File(s)
Summary
Posts query contract and API examples/lit/basic/src/services/posts/*, examples/lit/basic/src/services/todos/*
Adds post types, API methods, and query factories. Removes the todo API, queries, and types.
Posts navigation and display examples/lit/basic/src/post-list.ts, examples/lit/basic/src/post-detail.ts, examples/lit/basic/src/main.ts, examples/lit/basic/index.html, examples/lit/basic/README.md, examples/lit/basic/*
Replaces the todo demo with a posts list and detail view. The app tracks the selected post through events, and the list marks posts with cached detail data. Removes the previous demo and lifecycle fixtures and port configuration. Updates the page title and README.
Lit pagination example
Layer / File(s)
Summary
Project query and mock API examples/lit/pagination/src/services/projects/*, examples/lit/pagination/src/mocks.ts, examples/lit/pagination/public/mockServiceWorker.js, examples/lit/pagination/package.json, examples/lit/pagination/server/*, examples/lit/pagination/scripts/*, examples/lit/pagination/config/*, examples/lit/pagination/vite.config.ts
Defines the paginated project response and relative API request. Adds an MSW handler and worker, and removes the local API server, development launcher, and port configuration.
The app uses keepPreviousData, prefetches the next page when current data is not placeholder data and hasMore is true, and guards page navigation. The page title and README describe the example’s pagination behavior.
Lit SSR example and guide
Layer / File(s)
Summary
SSR query contracts and services examples/lit/ssr/src/services/{posts,users,comments}/*, examples/lit/ssr/src/makeQueryClient.ts, examples/lit/ssr/src/services/data/*
Adds post, user, and comment types, APIs, and query factories, plus a query-client factory. Removes the previous data service and query definitions.
Server prefetch and app rendering examples/lit/ssr/src/entry-server.ts, examples/lit/ssr/src/app.ts, docs/framework/lit/guides/ssr.md
The server fetches posts and optionally the first post’s author, dehydrates the prefetch cache, and renders with a separately hydrated client. The app creates and displays posts, author, and comments queries. The guide describes the server prefetch and render flow.
Express server and build wiring examples/lit/ssr/server.js, examples/lit/ssr/package.json, examples/lit/ssr/vite.config.ts, examples/lit/ssr/tsconfig.json, examples/lit/ssr/server/index.mjs, examples/lit/ssr/scripts/*, examples/lit/ssr/config/*
Adds an Express server with Vite middleware in development and static client serving in production. Updates build and run scripts and removes the prior server, development launcher, and port configuration.
Client hydration and SSR guidance examples/lit/ssr/src/entry-client.ts, examples/lit/ssr/src/main.ts, examples/lit/ssr/index.html, examples/lit/ssr/README.md, packages/lit-query/README.md
Adds browser-side query-client hydration before importing the app. Updates the HTML template and documentation to use window.__DEHYDRATED_STATE__ and uneval, and removes the prior client entry point.
|Other change examples/preact/ssr/server.js|Placeholder replacement now uses callbacks to insert rendered HTML and state.|
sequenceDiagram
participant Browser
participant ExpressServer
participant EntryServer
participant PostsAPI
participant UsersAPI
participant SsrApp
Browser->>ExpressServer: request SSR page
ExpressServer->>EntryServer: call render
EntryServer->>PostsAPI: fetch posts
EntryServer->>UsersAPI: optionally fetch first post author
EntryServer->>SsrApp: render with hydrated query client
EntryServer-->>ExpressServer: return HTML and serialized state
ExpressServer-->>Browser: return rendered HTML and state
Browser->>Browser: hydrate query client before importing app
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Suggested reviewers:tkdodo
Merge Risk: Minimal · up to 1d7a5
This change refreshes the Lit examples and the SSR guide. The earlier hydration and replacement concerns are addressed, and no actionable merge-blocking risk remains.
Pre-merge checks: 4
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Title check
The title names the main change: the Lit basic, pagination and SSR demos are rewritten to match the other adapters' examples. It also mentions the SSR output insertion with replacement callbacks, whic…
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The description follows the repository template. It has the Changes section, the Checklist section with all three items checked, and the Release Impact section. The Changes section explains the rewrit…
Full details: Title check
Explanation
The title names the main change: the Lit basic, pagination and SSR demos are rewritten to match the other adapters' examples. It also mentions the SSR output insertion with replacement callbacks, which matches the server.js change. The title is long (158 characters, 22 words) but stays on topic. The docs(examples/{lit,preact}) scope is accurate because the PR touches a Preact file too.
Full details: Description check
Explanation
The description follows the repository template. It has the Changes section, the Checklist section with all three items checked, and the Release Impact section. The Changes section explains the rewrite of the Lit basic, pagination, and ssr examples. It lists the removed files and folders, the new README files, the lit-query README update, the SSR guide update, and the replacement-callback fix in server.js for Lit ssr and Preact ssr. It also gives the motivation for dropping the pagehide unmount. The Release Impact section marks the change as docs/CI/dev-only, which matches the scope of the example and documentation changes. The description is complete and specific.
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Reviewing files that changed from the base of the PR and between ebe1f49 and 1d7a56c.
Files selected for processing: 4
docs/framework/lit/guides/ssr.md
examples/lit/ssr/server.js
examples/lit/ssr/src/entry-client.ts
examples/preact/ssr/server.js
Files with no reviewable changes: 2
docs/framework/lit/guides/ssr.md
examples/lit/ssr/src/entry-client.ts
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Actionable comments posted: 2
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @examples/lit/ssr/server.js:
- Around line 52-53: Update the two replacements in the server template
rendering flow to use callbacks that return rendered.html and rendered.state,
preserving dollar-sign sequences literally instead of interpreting them as
replacement-string patterns.
Review comments at @examples/lit/ssr/src/entry-client.ts:
- Line 20: Update the pagehide handler around queryClient.unmount() to preserve
the query client’s subscriptions when the page is being saved for
back/forward-cache restoration; skip unmounting for persisted events, or restore
the client subscriptions on pageshow if unmounting is required. Keep the
existing unmount behavior for non-persisted pagehide events.
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…acement callbacks and drop the 'pagehide' unmount
sukvvon
changed the title
docs(examples/lit/{basic,pagination,ssr}): rewrite the e2e demos to match the other adapters' basic, pagination and SSR examples
docs(examples/{lit,preact}): rewrite the lit basic, pagination and SSR demos to match the other adapters, and insert the SSR output with replacement callbacks
Nov 13, 2026
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🎯 Changes
Rewrite the Lit
basic,paginationandssrexamples, which were e2e demos (custom servers, port config, failure-injection endpoints,data-testids, multiple pages), to match the same examples of the other adapters:basic: a list of posts and a post detail view from JSONPlaceholder, with visited posts marked from the query cache, like the otherbasicexamples and Litbasic-graphql-request. Removes the todos demo pages (basic-query.html,mutation.html,lifecycle-contract.html).pagination: an MSW handler insrc/mocks.tsinstead of the custom Node API server andscripts/dev.mjs.projectsQueries.list(page)is read withcreateQueryControllerandplaceholderData: keepPreviousData, and the next page is prefetched inupdated(), like Preactpagination.ssr: the Vite SSR layout of Preactssr(server.jswith Express and Vite middleware mode,src/entry-server.ts,src/entry-client.ts), keeping Lit SSR with@lit-labs/ssr,lit-element-hydrate-support.jsand the explicitqueryClientproperty. The server prefetches the posts and the first post's author and dehydrates them withdevalue, and the comments are fetched on the client only.server.jsof Litssrand Preactssr, insert the rendered HTML and state with replacement callbacks, so$'and other replacement patterns in the data are kept as is instead of breaking the inline script.pagehideunmount from Litssrand the Lit SSR guide. Unmounting onpagehideremoves the focus and reconnect subscriptions when the page is kept in the back/forward cache, and the other adapters' SSR examples don't unmount.CHANGELOG.mdfiles and theconfig/,scripts/andserver/folders, and give each example a README like the other examples.lit-queryREADME, dropping the removed port and environment variables.✅ Checklist
pnpm run test:pr, or these tests do not apply to this pull request.🚀 Release Impact
Summary by CodeRabbit
New Features
Documentation
Changes