Replies: 26 comments 64 replies
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I started to experimenting with workerd/miniflare in Overall approach and code doesn't look so different from my previous one with vite runtime https://github.com/hi-ogawa/vite-plugins/tree/main/packages/vite-node-miniflare, but regarding the usability of current environment API, I have a few comments:
I haven't tested server hmr yet, but I plan to continue experiment on that later. |
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@patak-dev Thanks for the update. Asynchronous Expanding on my previous 2nd comment, I'd like to disable this vite/packages/vite/src/node/optimizer/index.ts Lines 781 to 786 in 7254175
@sheremet-va Yeah, I didn't mean to be an environment API feedback, but just wanted to mention as a general caveat for people trying workerd. Well, I thought so, but now looking at mrbbot's vitest integration, he seems to figure out a way around it by implementing Either way, it's a custom runtime side constraints, so I don't think Vite side needs to do anything for this. |
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Regarding environment agnostic SSR https://deploy-preview-16089--vite-docs-main.netlify.app/guide/api-vite-environment.html#environment-agnostic-ssr, the plugin is still registering middleware automatically, but the main feature is mostly moved to Currently I organized API in this way: WorkerdDevEnvironmentexport type WorkerdDevEnvironment =
DevEnvironment & {
api: {
dispatchFetch: (entry: string, request: Request) => Promise<Response>
}
}
export function createWorkerdDevEnvironment(
server: ViteDevServer,
name: string,
// allow miniflare customization inspired by vitest pool
// https://developers.cloudflare.com/workers/testing/vitest-integration/configuration/
workerdOptions: {
miniflare: { ... },
wrangler: { configPath?: string }
}
): Promise<WorkerdDevEnvironment>;Then configureServer{
configureServer(server) {
const devEnv = server.environments["workerd"] as WorkerdDevEnvironment;
const nodeHandler = webHandlerToNodeHandler(
(req) => devEnv.api.dispatchFetch(someEntry, req),
);
return () => {
server.middlewares.use(nodeHandler);
};
},
}Also thanks to cloudflare team's effort on Vitest pool, there are new features in wrangler such as All that said, how workerd feature is exposed to main vite process side is still only a minimal request handler, so the situation might not change drastically in terms of easy of existing complex frameworks to integrate. One thing I plan to look at next is whether it's possible to implement something similar to "magic proxy" cloudflare/miniflare#639 so that main vite process can transparently import modules from workerd just like |
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@sheremet-va I implemented Actually I'm not sure if it's correct (I haven't tested custom event), but it feels like it's mostly a boilerplate. Is this something like Vite can provide builtin utility like transport? |
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Yeah, we can implement a separate transport option for HMR to hide the boilerplate. |
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This should now work without |
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This is a feedback about a minor cosmetics of logging. Currently, simple SSR setup (like the one in a playground) shows somewhat puzzling logs: pnpm -C playground/environment-react-ssr dev
# after changing a shared file src/root.tsx
3:03:13 PM [vite] page reload src/root.tsx
3:03:13 PM [vite] page reload src/root.tsx
[vite] program reloadOn my react-server example with client hmr plugin, it gets more complex: pnpm -C examples/react-server dev
# initial log from two server environments
[vite] connected.
[vite] connected.
# after changing a shared file
3:13:02 PM [vite] hmr update /home/hiroshi/code/personal/vite-environment-examples/examples/react-server/src/routes/_client.tsx
3:13:02 PM [vite] page reload src/routes/_client.tsx
[vite] program reloadIn "two Vite servers" demo, I have {
customLogger: createLogger(undefined, {
prefix: "[react-server]",
allowClearScreen: false,
}),
}3:13:02 PM [react-server] page reload src/routes/test/page.tsxIs there a way to add log prefix like this for new environments? or maybe can each log have a prefix of |
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Good point. I think we should do this by default. The logger has a prefix option defaulting to @sheremet-va I see the |
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When running
I haven't dive into the code yet. For now, I made a reproduction here #16426 since you might know something. |
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Can service workers be a supported environment too? I'd like to build an offline web app almost the same as an online one. If server side rendering can be bundled to be used as service worker side rendering then an offline web app doesn't need to bundle and run most (if any) JavaScript in the document scope. |
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I think that could work. I was also thinking about Web Workers. Maybe we should also implement them using environments. We have some issues right now with the way they are implemented that could be cleaned up with them. If you have some time to try out the alpha, that would be great to inform our decisions with the API @mfulton26 |
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This is awesome to see. Wanted to ask about how something like injecting new globals or CSPs would work to emulate other environments, like extensions or a Kiosk mode. It'd be great to be able to add APIs not normally exposed in-browser and that may required server-side backing (like |
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hey! 👋 i was building a really simple spa with solid, and i wanted to change the but i wasn't really able to find an easy and simple way to do this at all!! perhaps customizing the behavior of vite's dev and build feel so difficult because the module resolution is so tightly coupled to your entry file, and perhaps this coupling is exactly what makes implementing ssr with vite so complicated in the first place. I am not quite settled on the correct way to solve this, but one of my ideas is perhaps the ability to set a jsx file (with exports) as your entry file, then write a plugin that has access to those exports and returns an html string? not really the most happy with that though, im curious what ideas other people have! At the end of the day, I would like basic ssg functionality (at least in solid) to be easily implementable by end users in your own 5-line vite plugin. |
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Seems like the The Vite Env API docs don't mention assets, so I'm not sure whether something is supposed to change in that regard. (Very excited and looking forward to the Vite Env API 👀) |
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hi! I'm experimenting with the Vite Env API in @lazarv/react-server and while I had some issues about using different root for envs, I had much more benefit from using the Env API vs using multiple instances of Vite servers. My feedback on Env API:
All-in-all, even in it's current state, Env API is the way to go, I'll continue to enhance my configuration and keep experimenting with it. Nice work! |
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Can you give more information on what the problem is? |
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I had to do the following patch on the transport, as I experienced issues because of how React resolution should work with the "react-server" loader condition and I had to externalize these React modules in the worker thread this way as the Vite module resolution on the main thread was wrong. Might be some wrong setup on my side, but it's fairly complex to support 3 envs using 2 different React versions while I want to resolve all React imports to the one used by the framework. const remoteTransport = new RemoteRunnerTransport({
send: (data) => {
parentPort.postMessage({ type: "import", data });
},
onMessage: (listener) =>
parentPort.on("message", (payload) => {
if (payload.type === "import") {
listener(payload.data);
}
}),
timeout: 5000,
});
remoteTransport.fetchModule = (id, importer) => {
if (["react", "react/jsx-dev-runtime", "react-dom/client"].includes(id)) {
return { externalize: id };
}
return remoteTransport.resolve("fetchModule", id, importer);
}; |
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Regarding
I create a PR #17394, but I have issues with the tests, if anyone interested to take a look, I would really appreciate help on that one, thanks! |
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I'm interested what developer experience the Environment API can unlock, it seems like this could be used to provide HMR with Cloudflare wrangler/workerd ? That is something I've wanted when using CF workers to build SPAs. cc/ @IgorMinar |
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The Environments API doc claims there are no breaking changes from v5.
However, this doesn't appear to be true. It appears the runtime API has been removed and replaced by the import {
createServer,
- createViteRuntime
+ createServerModuleRunner
} from "vite";
const server = await createViteServer();
- const runtime = await createViteRuntime(server);
+ const runner = createServerModuleRunner(server.environments.ssr);
- const foo = await runtime.executeUrl<Foo>("./Foo.ts");
+ const foo = await runner.import<Foo>("./Foo.ts"); |
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Although this will require some folks that were experimenting with the Runtime API released in 5.1 (in particular, Hydrogen is using the feature), this isn't a breaking change because it was released as experimental. Even more experimental than other times, with a big warning in the docs that we were going to change it and we were only releasing it to help the community explore. |
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Vite Runtime API was never stable, it's not subject to semver: https://vitejs.dev/guide/api-vite-runtime.html#vite-runtime-api
|
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Ah ok. It might be good to reassert that in the Environments API docs. That the runtime API will be removed and replaced by the new API. |
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Will this API enable the use of the server during build? I have a vite plugin where I need to import |
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Module Runners are dev only. During build time, you aren't running code, only generating the bundle. |
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I'm trying out the runner feature, I'm trying to achieve something like vite-node (without creating the actual CLI). I want to run a TS script in watch mode and also have HMR, but I can't figure out the HMR part. I never learned how HMR works internally, I only learned how to consume it, so I didn't know what to put in the vite/packages/vite/src/node/server/hmr.ts Line 904 in d7f46e9 so I tried to use that, but even though I didn't have
|
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This is not true.
Seems like we didn't expose import { createServer, createNodeDevEnvironment, createServerHotChannel, createServerModuleRunner } from 'vite'
const server = await createServer({
environments: {
node: {
dev: {
create(name, config) {
return createNodeDevEnvironment(name, config, {
hot: createServerHotChannel(),
})
}
}
}
}
})
const runner = createServerModuleRunner(server.environments.node)On the other hand, I don't understand why you need to create a custom environment instead of just passing down the default - const runner = createServerModuleRunner(server.environments.node)
+ const runner = createServerModuleRunner(server.environments.ssr) |
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Unintentional, probably because the what I'm importing also has "node" in it. Thanks for pointing out the oversight.
How do I use it, though? Which part of the |
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Replace This is a bug, I will look into it. |
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Awesome, it works! Thank you very much ❤️ |
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I noticed that if I don't configure I keep learning that Vite will do a deep merge with the defaults, and that I don't have to configure everything. |
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Currently runners seem to be intended to be used for finite scripts, but in my case I'm using them for a long-running process because my Express code is written in TypeScript, so I'm running the code that starts the Express server with a module runner. This is working pretty ok as hinted in #16358 (comment), but whenever I change the Vite config the runner doesn't restart, I have to do it manually. I didn't really expect this to work, but I'm wondering what the recommended workflow here is 👀 I tried building a development-only plugin that turns on middleware mode and adds Vite's middleware to the Express server in
|
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This is a great example that fixed one of my main problems. Instead of importing outside the handler I should be importing inside the handler, that was the reason why changes to my SSR source code were having no effect. Instead of {
configureServer(server) {
const runner = createServerModuleRunner(server.environments.ssr);
const handler = async (req, res, next) => {
try {
const mod = await runner.import('/src/server/server.ts');
mod.default(req, res, next);
} catch (err) {
next(err);
}
};
return () => {
server.middlewares.use(handler);
};
},
}What I'd like to achieve now is to catch hot updates of any modules that start with I've been trying things out with the new {
hotUpdate({ file }) {
if (this.environment.name === 'client') {
if (file.includes('/src/server')) {
this.environment.hot.send({ type: 'full-reload' });
return []
}
}
},
}This is a simplified example, the real example was going through the Is there a recommended approach? |
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Probably what's missing is that you'll need to watch change in Astro (also other frameworks) plans to do something similar in Vite 6 and this might help https://github.com/withastro/astro/pull/11979/files#diff-c13c74ccffcd018429b8800d30e3be92e31d4a7a8595a1fee0e300e8b1ae8591 |
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That's clever, I didn't think to mix & match like that! I guess that's in part why that hook exists 😄 But I'm facing continuous data loss as I'm changing files, and I managed to come up with a repro based on the Data fetching is contrived to reflect how my app is fetching data, but it's still small. If you edit any of the SSR files the data value from the singleton will be gone and my app will have to refetch it. Initially I thought that I should be using Or should I be using something like |
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The thing is that I'd like to revalidate that data fetching in case I change certain files (in this case pretty much just Anyway I just wanted to know which tool should I be using to solve my problem. public static get singleton() {
if (import.meta.hot) {
import.meta.hot.data.singleton ??= new Data();
Data.#singleton = import.meta.hot.data.singleton;
} else {
Data.#singleton ??= new Data();
}
return Data.#singleton;
} |
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I would imagine using |
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I apologize for my ignorance, I'm new to Vite, and I'm hoping to build a plugin library that essentially provides you an API router. I'd like people to be able to use the plugin with their choice of runtime in their project - node, bun, deno, etc (including runtimes on the edge). Routes are declared with directories and route.js files (or .ts). I have a POC working with the Bun runtime, using a Bun plugin; but it seems to have some limitations that Vite's Environment API might be able to address. I've read the basic Rollup plugin docs, gone through the Environment API docs a couple of times, but I'm not understanding if the new API is a good use-case for me to try. Everything is a bit overwhelming for a newbie - at least for me. I figured I could create a bun environment, which has some type of module runner; but, in the flow graphic at the top of the docs, I'm not understanding how the runtime (workerd in the graphic) is tied to the module runner and Vite dev server. I assumed I'd be able to somehow determine that a dev is wanting to use the Bun runtime, then use Bun.serve to serve their routes during dev; then, of course, bundle everything at buildtime. Any insights? |
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I noticed that we have a same problem with #12734 if a different server (e.g. miniflare) is used in DevEnvironment. |
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Maybe it's easier to revert #12379 and apply a different fix for #12375. |
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I see the issue now. It was working when miniflare assigns random port, but it crashed when fixed the port: 6:26:36 PM [vite] server restarted.
6:26:38 PM [vite] vite.config.ts changed, restarting server...
workerd/util/symbolizer.c++:101: warning: Not symbolizing stack traces because $LLVM_SYMBOLIZER is not set. To symbolize stack traces, set $LLVM_SYMBOLIZER to the location of the llvm-symbolizer binary. When running tests under bazel, use `--test_env=LLVM_SYMBOLIZER=<path>`.
*** Fatal uncaught kj::Exception: kj/async-io-unix.c++:945: failed: ::bind(sockfd, &addr.generic, addrlen): Address already in use; toString() = 127.0.0.1:12345
|
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Made an issue here: #18264 |
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I seem to have run into an incompatibility with the module runner and the client bundler, they're processing the https://stackblitz.com/edit/vitejs-vite-3bjmc7?file=index.html In the browser console you can see the error that Is there something specific about this module that's causing this incompatibility? |
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Probably this is an issue on I would assume Btw, this is not technically an issue with environment api specifically (should be reproducible on old |
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Thanks a lot, this is indeed a problem with the package, not the API, I totally spaced out on the As a quick fix I'm using only named exports and forced You guys are super helpful, I really appreciate it ❤️ |
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Hi, I noticed one "quirk": |
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It looks like |
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Makes sense 👌 |
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Unrelated feedback to the above. I'm confused by the intention behind {
build: {
createEnvironment(name, config) {
// this doesn't work 😕 at least not in "vite build --app"
return new BuildEnvironment(name, config, { options: config.environments[name] });
},
},
environments: {
ssr: {
build: {
target: 'node20',
},
},
},
builder: {
sharedConfigBuild: true,
},
}Nor does varying config passed to |
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That is a bug. On a related note, we discussed with Bjorn and he was very interested in not allowing |
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Why only |
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Having environment config defaults at root is important to keep Vite as simple as it is today to configure for SPAs. It is a hard sell if the simplest config becomes: export default defineConfig({
environments: {
client: {
build: {
minify: false
}
}
}
})For SPAs, this will also force us to introduce environments right away to users. There are some team members that think that we should keep environments as an advance feature too. I think once you introduce One thing that we could do in the future is to remove |
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Ah, I understand, this has to be handled very gradually. In your example top-level And the top-level |
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Yes, we have |
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I noticed that Is this behavior deliberate? I realize that the API could in that case be tricky because what would it mean if |
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Ok, |
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I have a plugin that is working, but I can't figure out how to get HMR fully working when I change a route file. Anyone know how I can resolve this? Here is part of my plugin. During my attempt to work around this, I'm declaring async configureServer(server) {
console.log('########## CONFIGURING SERVER ##########')
//const runner = createServerModuleRunner(server.environments[validated_config.environment])
runner = createServerModuleRunner(server.environments.ssr)
await createManifest(runner, validated_config, true)
api = await runner.import(path.join(cwd, 'index.ts'))
server.middlewares.use(async (req, res) => {
console.log('running vite middlewares')
const base = `${server.config.server.https ? 'https' : 'http'}://${req.headers[':authority'] || req.headers.host}`
const request = await getRequest(base, req)
const response = await api['default'].fetch(request)
setResponse(res, response)
})
},
async hotUpdate(context) {
console.log('changed file', context.file)
/* Ensure we only try to import if a route file has changed. */
if (context.file.includes('route.ts')) {
console.log('import route file')
await runner.import(context.file)
console.log('done importing route file')
}
/* Import server entry file. */
api = await runner.import(path.join(cwd, 'index.ts'))
}I experimented with When changing the entry point index.ts file, and saving changes, here is what happens - entry point changes are reflected at runtime.
When changing a route file, and saving changes, here is what happens - route file changes are not reflected at runtime.
|
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async hotUpdate(context) {
if (context.file.includes('route.ts')) {
await createManifest(runner, validated_config, true) /* Custom function that handles newly-created route files. */
this.environment.hot.send({ type: 'full-reload' }) /* Handles updated route files. */
}
api = await runner.import(path.join(cwd, 'index.ts')) /* Needed for all changed files, but alone covers the server entry point. */
} |
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It's possible that you don't need the api = await runner.import(path.join(cwd, 'index.ts'))inside your Check out the example in Vite's playground: vite/playground/environment-react-ssr/vite.config.ts Lines 74 to 75 in 1fe949d |
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@silvenon you're right! I thought I had tried that already and it threw, but it's working. Thanks!! (Still need |
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Here is what async hotUpdate(context) {
if (context.type === 'create' && context.file.includes('route.ts'))
await createManifest(runner, validated_config, true)
} |
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Great! Glad you got it working! I thought importing on every request would be costly, but apparently the module runner is very efficient 💨 |
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So, am I supposed to be able to literally use a runtime (Deno, Bun, etc) for the dev server, or do you always have to use Vite's Connect dev server - even with the Environment API? I've just barely been able to glue something together, where my plugin is importing the developer's server module, and then I'm manipulating Vite dev server's Connect.IncomingMessage Beside that, I'm still trying to wrap my head around when you'd wire up a custom environment. I apologize for my ignorance. |
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The new environment API docs answered my question; which seems to be: "you still have to go through the Vite dev server, even if another runtime is ultimately handling the request/response" |
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Vite's dev server will be running in another runtime anyway, no? It won't be as efficient as writing a Vite dev server just for Bun, but AFAIK it's not nothing. Also, I think it's safer to attach your own middleware after Vite attaches its own, so in the function returned by |
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What advantages are there to allowing vite to run its middleware before my own? And how would I configure it to work as such? |
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My thinking was that it would find stuff like assets sooner. Currently by running your app before Vite's own middleware your app is being run for absolutely every app request. But by plugging in your app afterwards your app might not need to run at all for many requests, because they will have been handled by Vite's own middleware. Here's how you would set that up: configureServer(server) {
runner = server.environments.ssr.runner
const handler = async (req, res) => {
const web_server = await runner.import(path.join(cwd, entrypoint))
const request = await convertIncomingMessageToRequest(req)
const response = await web_server.default.fetch(request)
convertResponseToResAndReturn(res, response)
}
return () => {
server.middlewares.use(handler)
}
},The only difference is that the handler is plugged in in the returned function rather than immediately. Vite calls that function once it adds its own middleware. |
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Gotcha, thanks! |
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Regarding |
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I am open to renaming if you think it reflects the naming convention better. I am not sure about |
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I heard somewhere that Environments can allow skipping the SSR manifest business. If this is true, how is that intended to work? In the default client and SSR environment setup, how can I do a I noticed that builder's What used to work for me in But I understand why that shouldn't work, I guess because there's nothing in those imports that say that those are client environment imports, for all Vite knows I wanted additional SSR copies of those assets. |
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For example I have the following React component: import scriptUrl from '/src/client/ads.ts?url';
function AdScript() {
return (
<script src={scriptUrl} />
)
}It runs in both client and SSR environments. During development this seems to be working fine, but in production the URL remains the unprocessed (but hashed) |
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Unrelated to the above — can {
apply(_config, { command }) {
this.environment.name === 'client' && command === 'build'
},
}Or is Alternatively, I'm aching for a more compact version of {
applyToEnvironment: 'ssr',
} |
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We can't merge it because About the more compact version, we don't want to promote applying per environment by name. Hopefully you would apply a plugin depending on environment.config instead so it still work with any environment. The verbose form is better here as a nudge in that direction. |
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Hello, i'm trying to use the new Environment api to see how it will help with my setup also not to distribute you what i'm trying todo with env api is to build ssr multi tenant app so I have diff css config for each tenant and diff entry point as well |
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There is something I'm still struggling to understand about One of the main goal is to be able to mimic production environments during dev. Let's take a Now let's say I'm developing a Vite plugin that adds a middleware to the devServer: devServer.use((req, res) => {
if (req.url === '/my-plugin') {
// Here, I want to load and run user provided code
// Let's say `api/handler.my-plugin.ts`
// ...
}
});In this example, how do I make sure that my middleware also runs user provided code inside For now, I have the feeling that "my-plugin" must know that What I would like to have as a plugin author would rather be that any code by default runs under If |
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I think you're looking for: |
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Thanks @patak-dev |
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We decided to release the Environment API branch as
vite@6.0.0-alpha.x(we'll continue regularly releasing new alpha patches).The changes started by the Runtime API are now prompting a complete review of the way Vite handles environments (client, SSR, workerd, etc). We were originally going to release this branch as
vite@5.3.0-alpha.0but the changes are now too big for a minor so we're going to start working on the next major directly with it. We're probably going to have ~2 months of alpha period and once we feel confident with the stability of the new APIs, we'll kick the beta.If you are building a framework or are working in a Runtime (like the Cloudflare team), the next months are going to be very important to get the APIs right and serve as the base for the next iteration. We're thinking on lifting Vite's responsibilities to be able to share more in the ecosystem. For example, we're introducing the concept of a
ViteBuilderthat lets frameworks orchestrate all the environment builds they need to get a singlevite buildcommand to build the whole app. This means changing our stance on the "framework-as-a-plugin" pattern (SvelteKit, Remix, QwikCity, etc), and making it a first class pattern from Vite 6 forward.Check out the current Environment API docs and give us feedback. This discussion is a good place to gather it, please share your impressions and PoCs as you test.
If you think someone you know would be interested in helping us testing and creating prototypes (Workerd framework-agnostic integrations, RSC, etc), please contact them so they can get involved.
Resources:
Previous discussions:
History:
Check out @antfu's Dev SSR on Nuxt post, explaining @pi0's Dev Bundler idea that led to the creation of vite-node. Anthony used vite-node to as the engine of Vitest. After revamping it, @sheremet-va added a revised version of vite-node in Vite Core in Vite 5.1. The Environment API is a new iteration, deeply integrating the features vite-node provided in Vite's API.
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