feat: Vite environment API - #14008

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feat: Vite environment API#14008
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closes#13692
closes#1712
part of #3535
closes#13739
closes#13357
closes#12637

w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....

This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.

Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:

TODO

  • Cloudflare dev
  • Cloudflare build
  • Node
  • vite-plugin-netlify
  • Vercel?
  • SPA/static?

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

  • It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  • This message body should clearly illustrate what problems it solves.
  • Ideally, include a test that fails without this PR but passes with it.

Tests

  • Run the tests with pnpm test and lint the project with pnpm lint and pnpm check

Changesets

  • If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

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  • Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.

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Latest commit: 7fdfe68

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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Latest commit: 71e3d5a

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

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teemingc marked this pull request as draft July 17, 2025 05:26
@benmccann

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You probably need to bump the peer dep version on Vite

@benmccannbenmccann added this to the 3.0 milestone Jul 17, 2025
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You probably need to bump the peer dep version on Vite

Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app

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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/

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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.

I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.

@Giggiux

Giggiux commented Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.

Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!

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@Giggiux

Giggiux commented Nov 22, 2025

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Hey @teemingc is there any way we can help in moving this PR forward?
I could try and spend some time on it, but I am very well conscious that I have no idea where to start.

@teemingc

teemingc commented Nov 23, 2025

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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.

Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API

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This was referenced Nov 25, 2025
Closed
Closed
hynj added a commit to hynj/kit-vite that referenced this pull request Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc

teemingc commented Feb 5, 2026

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Closing this because we'll be starting this from scratch next week

@teemingcteemingc closed this Feb 5, 2026
@kvanbere

kvanbere commented Feb 21, 2026

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Is there a new PR for it?

benmccann
benmccann reviewed Feb 24, 2026
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Comment threadpackage.json
]
],
"overrides": {
"esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?

@teemingcteemingcFeb 25, 2026

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Related to benmccann/esm-env#20

@petebacondarwin

petebacondarwin commented Apr 5, 2026

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Is there a new PR for it?

This I think: #15627

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Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare Cloudflare Worker Adapter - Durable Objects

8 participants

@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin
, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
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@teemingc
@teemingcteemingc
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Jul 17, 2025•

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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
  •  Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
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Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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⚠️ No Changeset found
Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@teemingc
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marked this pull request as draft
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@benmccann
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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
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Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
 Closed


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hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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Closing this because we'll be starting this from scratch next week
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Is there a new PR for it?
benmccann
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
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Related to benmccann/esm-env#20
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


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@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin

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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
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@teemingc
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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
  •  Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
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⚠️ No Changeset found
Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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⚠️ No Changeset found
Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@teemingc
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July 17, 2025 05:26
@benmccann
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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
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Jul 17, 2025
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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
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Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Nov 22, 2025

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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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Nov 23, 2025

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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
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hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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Feb 5, 2026

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Closing this because we'll be starting this from scratch next week
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Feb 5, 2026
@kvanbere
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Feb 21, 2026

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Is there a new PR for it?
benmccann
benmccann
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Feb 24, 2026
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
@teemingcteemingcFeb 25, 2026

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Related to benmccann/esm-env#20
@petebacondarwin
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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breaking changepkg:adapter-cloudflarevite

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Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


8 participants

@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
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@teemingc
@teemingcteemingc
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Jul 17, 2025•

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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
  •  Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
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⚠️ No Changeset found
Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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⚠️ No Changeset found
Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@teemingc
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marked this pull request as draft
July 17, 2025 05:26
@benmccann
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Jul 17, 2025

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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
added this to the 3.0 milestone
Jul 17, 2025
@teemingc
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Jul 18, 2025•

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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Jul 22, 2025
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@teemingc
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Sep 12, 2025

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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
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Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Nov 22, 2025

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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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Nov 23, 2025

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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
 Closed


Closed

hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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Feb 5, 2026

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Closing this because we'll be starting this from scratch next week
@teemingcteemingc
closed this
Feb 5, 2026
@kvanbere
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Feb 21, 2026

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Is there a new PR for it?
benmccann
benmccann
reviewed
Feb 24, 2026
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
@teemingcteemingcFeb 25, 2026

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Related to benmccann/esm-env#20
@petebacondarwin
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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breaking changepkg:adapter-cloudflarevite

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Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


8 participants

@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Conversation
@teemingc
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Jul 17, 2025•

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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
  •  Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
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⚠️ No Changeset found
Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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⚠️ No Changeset found
Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@teemingc
teemingc
marked this pull request as draft
July 17, 2025 05:26
@benmccann
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Jul 17, 2025

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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
added this to the 3.0 milestone
Jul 17, 2025
@teemingc
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Jul 18, 2025•

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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
@svelte-docs-bot
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Jul 22, 2025
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6 tasks
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@teemingc
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Sep 12, 2025

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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
Giggiux
commented
Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Nov 22, 2025

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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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commented
Nov 23, 2025

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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
@Giggiux

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This was referenced Nov 25, 2025
 Closed


Closed

hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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commented
Feb 5, 2026

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Closing this because we'll be starting this from scratch next week
@teemingcteemingc
closed this
Feb 5, 2026
@kvanbere
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Feb 21, 2026

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Is there a new PR for it?
benmccann
benmccann
reviewed
Feb 24, 2026
View reviewed changes
Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
@teemingcteemingcFeb 25, 2026

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Related to benmccann/esm-env#20
@petebacondarwin
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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breaking changepkg:adapter-cloudflarevite

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Development

Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


8 participants

@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Conversation
@teemingc
@teemingcteemingc
commented
Jul 17, 2025•

edited

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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
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  •  Ideally, include a test that fails without this PR but passes with it.
Tests
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Latest commit: 71e3d5a
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.
This PR includes no changesets
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@benmccann
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You probably need to bump the peer dep version on Vite
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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
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Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
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hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
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Closing this because we'll be starting this from scratch next week
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Is there a new PR for it?
benmccann
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
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Related to benmccann/esm-env#20
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Is there a new PR for it?
This I think: #15627
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Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


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, 'i');
if (__m === '*' || __re.test(location.href)) {
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})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
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environment-api
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@teemingc
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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
  •  Please ensure that 'Allow edits from maintainers' is checked. PRs without this option may be closed.
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Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
@teemingc
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July 17, 2025 05:26
@benmccann
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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
@Giggiux
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Oct 8, 2025

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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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Nov 23, 2025

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Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
 Closed


Closed

hynj added a commit
to hynj/kit-vite
that referenced
this pull request
Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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Feb 5, 2026

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Closing this because we'll be starting this from scratch next week
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Feb 5, 2026
@kvanbere
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Feb 21, 2026

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Is there a new PR for it?
benmccann
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Feb 24, 2026
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
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Related to benmccann/esm-env#20
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


8 participants

@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
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style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
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/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
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/* Restore images, videos, iframes, canvas */
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filter: invert(1) hue-rotate(180deg) !important;
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.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
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var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
feat: Vite environment API - #14008
Closed
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Closed
feat: Vite environment API#14008
teemingc wants to merge 20 commits into
mainfrom 
environment-api
Conversation
@teemingc
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closes#13692
closes#1712

part of #3535
closes#13739
closes#13357
closes#12637
w.i.p and still has a lot of problems to solve. Needed to open this PR to test installing this from pkg.pr.new since linking locally with pnpm symlinks to the local kit repo. Then, when we try importing kit code from inside an environment, it results in a path which doesn't exist such as /packages/kit/.... Instead, it should probably import from node_modules/@sveltejs/kit/....
This PR adopts the Vite Environment API in kit and changes adapter-cloudflare to use a similar approach to Remix where the user can specify their own worker.js file. Otherwise, we can generate the wrangler config and worker for them. This approach integrates well with vite-plugin-cloudflare and provides users with direct access to the worker script, allowing them to export Durable Objects and add additional handlers.
Thanks to @jamesopstad for #12637 and writing up the Google Doc explaining the Remix and vite-plugin-cloudflare integration. Resources include:
TODO
  •  Cloudflare dev
  •  Cloudflare build
  •  Node
  •  vite-plugin-netlify
  •  Vercel?
  •  SPA/static?
Please don't delete this checklist! Before submitting the PR, please make sure you do the following:
  •  It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
  •  This message body should clearly illustrate what problems it solves.
  •  Ideally, include a test that fails without this PR but passes with it.
Tests
  •  Run the tests with pnpm test and lint the project with pnpm lint and pnpm check
Changesets
  •  If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.
Edits
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Latest commit: 7fdfe68
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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Latest commit: 71e3d5a
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.
This PR includes no changesets
When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types
Click here to learn what changesets are, and how to add one.
Click here if you're a maintainer who wants to add a changeset to this PR
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July 17, 2025 05:26
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You probably need to bump the peer dep version on Vite
@benmccannbenmccann
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You probably need to bump the peer dep version on Vite
Thanks! I missed that. Bumped it to 7 because I think 6 is missing some Environment API behaviour around multiple plugins building the app
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Preview: https://svelte-dev-git-preview-kit-14008-svelte.vercel.app/
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Sorry this got paused for such a long time. Took a little time off from this since we were getting remote functions out, then I had some non-SvelteKit work too.
I left a bunch of TODOs in the code which should be enough to get started but I imagine resolving the merge conflicts since remote functions were merged would be step 1. The major goals are in the TODO list from the post at the top of the thread (get it working in cloudflare dev / vite dev). Hopefully I return to this this month if not next.
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I am currently bypassing this issue using the approach defined in this repository, using alchemy.dev. But it adds a bunch of extra dependencies, it requires creating a new Worker script with the Durable Objects that after deployment is attached as a binding to the SvelteKit workers, and most importantly requires an "hack" in dev to send the requests via fetch to the secondary workers dev server, instead of using bindings.
Adding support for the official cloudflare vite plugin, and for websockets would make development with Cloudflare as a target even better with SvelteKit!
@Ayfri

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@Giggiux
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Nov 22, 2025

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Hey @teemingc is there any way we can help in moving this PR forward?

I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
@teemingc
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Nov 23, 2025

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MemberAuthor
Hey @teemingc is there any way we can help in moving this PR forward? I could try and spend some time on it, but I am very well conscious that I have no idea where to start.
Hey @Giggiux we’re waiting until SvelteKit 3 before we move to the environment API
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This was referenced Nov 25, 2025
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hynj added a commit
to hynj/kit-vite
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Dec 17, 2025
@hynj
feat: add Vite 7 Environment API support
f2b9271
- Upgrade to Vite 7.0.3 and add pnpm override to ensure consistent versions
- Add sveltekit_vite_environment virtual module for dev-time manifest access
- Add DevEnvironment type for sharing state between plugin and dev server
- Add environment.js utilities for module resolution in Vite environments
- Update dev server to populate and invalidate environment module
- Support environments config for future isolated builds
This is a minimal port of the Environment API changes from PR sveltejs#14008,
enabling Vite 7 support while maintaining compatibility with existing
adapters.
@teemingc
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Feb 5, 2026

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Closing this because we'll be starting this from scratch next week
@teemingcteemingc
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Feb 5, 2026
@kvanbere
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Feb 21, 2026

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Is there a new PR for it?
benmccann
benmccann
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Feb 24, 2026
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Comment threadpackage.json
 ]
 ],
 "overrides": {
 "esm-env": "github:benmccann/esm-env#bcbddbc&path:packages/esm-env"
@benmccannbenmccannFeb 24, 2026

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just curious, is there a reason you had to do this? is there anything you need me to fix in it?
@teemingcteemingcFeb 25, 2026

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Related to benmccann/esm-env#20
@petebacondarwin
petebacondarwin
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Apr 5, 2026

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Is there a new PR for it?
This I think: #15627
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breaking changepkg:adapter-cloudflarevite

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Successfully merging this pull request may close these issues.

Allow custom worker script when deploying to Cloudflare

Cloudflare Worker Adapter - Durable Objects


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@teemingc@benmccann@umgefahren@didier@Giggiux@Ayfri@kvanbere@petebacondarwin