[lxsmnsyc]

Adds start.earlyHints, off by default. A production SSR build sends the client entry's scripts and stylesheets as 103 Early Hints before a page renders, so the browser starts downloading them while the server runs middleware, setup and the render. It is the counterpart of SolidStart's earlyHints.

solid({ start: { earlyHints: true }, ssr: true })

Changes

• Before the page render, the generated handler builds Link values from the client manifest. They cover the client entry, its static imports (rel=modulepreload), and their stylesheets (rel=preload; as=style). The list is computed once per process.
• The hints go out after the middleware chain reaches the page render, as in SolidStart. Requests that middleware answers, and server-function calls, get none.
• handleRequest(request, { earlyHints }) takes a callback that receives the links. The start.node entry and vite preview pass one that calls res.writeEarlyHints(), through a new nodeEarlyHints helper in src/http.ts.
• Without a callback, the links are added as Link headers on the page response, through the request event's response stub. CDNs such as Cloudflare turn those into 103 responses.
• A non-function earlyHints option is rejected like the other handleRequest options.
• resolveClientEntry now shares a clientEntryKey() helper with the hint walk. Its behavior is unchanged.
• README: a new earlyHints section.

Not included

• SolidStart also hints the assets of lazy route components as they load during SSR. The plugin has no router, so this PR covers the client entry's graph only.
• Dev and client mode send no hints.

Testing

• New early-hints mode in examples/start-ssr/test/run.mjs, 12 assertions. It uses node:http to see the 1xx responses:
  • start.node: a page gets a 103, the hinted entry script is the one the page loads, the hinted stylesheets are the page's, every hinted URL answers 200, the final response has no Link header, and a server-function request gets no hints.
  • server.js (calls handleRequest without a callback): no 103, and the same links arrive as Link headers.
  • vite preview: a page gets a 103.
  • Without the option: no 103 and no Link header.
• The node (89), preview (50) and prod (77) modes, the examples/start-client suite (70) and vitest run still pass.

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Latest commit: a08788b

The changes in this PR will be included in the next version bump.

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@solidjs/vite-plugin	Patch

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