# ! Rushabh | Linux Shill - lib/import-eecircuit-...

Channel: #contributor
Source: https://discord.com/channels/1233487248129921135/1519809315601650036
Started: 2026-06-25T20:59:37.993000+00:00
Last activity: 2026-06-27T17:43:08.195000+00:00

## ! Rushabh | Linux Shill — 2026-06-25T20:59:37.531000+00:00

lib/import-eecircuit-engine.ts loads the 21 MB engine by fetching it from the CDN, wrapping the source in a Blob, and calling import(blob:…). Browsers and Bun support importing a blob: URL; Node's ESM loader does not — it throws "Only URLs with a scheme in: file, data, and node are supported… Received protocol 'blob:'". So any consumer that runs simulations under Node (e.g. svg.tscircuit.com's Next.js Node runtime) fails. I verified this end-to-end: with a file:// temp-file import the same circuit produces both transient graphs under Node.

Therefore svg.tscircuit.com fails
https://svg.tscircuit.com/?svg_type=schsim&code=H4sIAJSWPWoAA21S0WqDMBT9leBeWthau64vZQqF7mGwraPrZA%2FCSPVqA5qEmzg6xH9fok2Vrj55z8m5956T1B7jKRwnWh29pQdHKVCTFDJaFZqMxiQIySjmhDzuBcWUoKg04%2FmaKbovIA0tZcgfUWiagxIVJkA4LSGIvWgWe%2BTEmHK2iEytksNXUN%2FNGzJ1YlqWoAG7ijj16tXIHZaIQqABb7LMN19P5EjlwWwjC%2Fr71gmfv182q%2FVQyzkkmgmugrp2KCFSqCWJvUk0IyGZSMbNvNue5pC39PYa3TTd39kDgmJKC3Tbb633DqQ8scj92bzxngmhJTKuDeE%2F%2BJazrU7NNFKTYoaiNHS%2FgD2lhYXOK18IT2FLFHu4iDPafO6u5DmfLZIs%2BxeW2rVzht7dCYQMEIyn7shwlT4Td7OcFiJXrKwKai%2FA9UgrbGv7KkrV99ashHfADw3SUr5fDUglWQJPPGfc%2BuF5Ww%2BHmoHT9pWGY6%2F5A0JngCrYAgAA
for 
```ts
<board routingDisabled>
    <voltagesource name="V1" voltage="15V" schX={-3} />
    <ammeter
      name="AM1"
      color="#ff0000"
      graphDisplayName="I_LOAD"
      connections={{
        pos: ".V1 > .pin1",
        neg: ".R1 > .pin1",
      }}
    />
    <resistor name="R1" resistance="2" schX={3} footprint="0402" />

    <trace from=".R1 > .pin2" to=".V1 > .pin2" />

    <voltageprobe
      name="VOUT"
      color="#315cff"
      connectsTo=".R1 > .pin1"
      referenceTo=".V1 > .pin2"
    />

    <analogsimulation
      duration="1ms"
      timePerStep="100us"
      spiceEngine="ngspice"
    />
  </board>
```
<@778624824875941908>

## ! Rushabh | Linux Shill — 2026-06-25T21:00:23.228000+00:00

[attachment]
Attachment: image.png — https://community.tscircuit.com/media/1519809507096789002

## shibo — 2026-06-25T21:03:49.785000+00:00

see how eval does it in runframe?

## shibo — 2026-06-25T21:42:59.068000+00:00

actually I noticed no spice simulation works in the docs

## shibo — 2026-06-25T21:43:01.694000+00:00

<@452450065941004289>

## shibo — 2026-06-25T21:43:04.081000+00:00

it used to work

## ! Rushabh | Linux Shill — 2026-06-25T21:43:24.494000+00:00

ik

## ! Rushabh | Linux Shill — 2026-06-25T21:43:37.263000+00:00

the issue is in svg.tscircuit.com

## ! Rushabh | Linux Shill — 2026-06-25T22:48:45.396000+00:00

<@778624824875941908> this broke it https://github.com/tscircuit/ngspice-spice-engine/pull/22

## ! Rushabh | Linux Shill — 2026-06-25T22:48:48.366000+00:00

<@809856037376491570>

## ! Rushabh | Linux Shill — 2026-06-25T22:50:09.154000+00:00

i think we should revert back to package imports

## shibo — 2026-06-25T22:50:52.546000+00:00

why? it works in eval, runframe and the cli, we just gotta figure out why it failed in svg.tscircuit.com

## ! Rushabh | Linux Shill — 2026-06-25T22:51:22.527000+00:00

hmm

## ! Rushabh | Linux Shill — 2026-06-25T22:55:41.595000+00:00

found the error 
```
Compilation Error
Simulation failed for"simulation_experiment_0": OnlyURLs with a scheme in: file,data, and node are supported bythe default ESM loader. Receivedprotocol 'blob:'
```

## ! Rushabh | Linux Shill — 2026-06-25T23:03:35.498000+00:00

- `runframe` works because browser
- `cli` works because temp-file import

## shibo — 2026-06-25T23:17:48.707000+00:00

<@757706909351411845>

## Seve — 2026-06-25T23:18:54.952000+00:00

ok so basically we don't work it NODE right now, we work in browser and bun is that right?

## Seve — 2026-06-25T23:19:08.295000+00:00

we might work in newer versions of node- <@452450065941004289> can you replicate locally

## Seve — 2026-06-25T23:20:09.160000+00:00

also RE: svg.tscircuit.com, we should preload the ngspice library, i think we might have done this for other libraries, should not be a big deal?

## Seve — 2026-06-25T23:20:34.174000+00:00

i.e. svg.tscircuit.com or basically ANY server shouldn't be loading from CDN- it should be a dev dep that is packaged when the server is deployed

## ! Rushabh | Linux Shill — 2026-06-26T13:31:08.288000+00:00

https://github.com/tscircuit/svg.tscircuit.com/pull/1686 <@809856037376491570>

## shibo — 2026-06-26T13:37:20.177000+00:00

did you reproduce the issue locally before implementing the fix?

## ! Rushabh | Linux Shill — 2026-06-26T13:46:03.425000+00:00

no, inspected how  `@tscircuit/eval` does it and copied the logic

## ! Rushabh | Linux Shill — 2026-06-26T13:46:56.170000+00:00

https://svg-tscircuit-jvr3rmmex-tscircuit.vercel.app/

## shibo — 2026-06-26T13:46:57.227000+00:00

we need a repro first, how could we know if this fix worked?

## ! Rushabh | Linux Shill — 2026-06-26T13:47:24.410000+00:00

https://svg-tscircuit-jvr3rmmex-tscircuit.vercel.app/
i tested it here after deployment

## shibo — 2026-06-26T13:47:36.048000+00:00

maybe the issue is not present locally, but only in live deployment

## ! Rushabh | Linux Shill — 2026-06-26T13:47:42.534000+00:00

yes

## shibo — 2026-06-26T13:47:46.911000+00:00

live deployment sometimes is not the same as the preview deployment

## shibo — 2026-06-26T13:47:51.143000+00:00

so we must reproduce the issue first

## shibo — 2026-06-26T13:48:02.431000+00:00

basically revert your change, see if you get the issue, then push it

## ! Rushabh | Linux Shill — 2026-06-26T13:52:48.738000+00:00

This is for the curent pr: https://svg-tscircuit-jvr3rmmex-tscircuit.vercel.app/
This is the live deployment link for previous pr: https://svg-tscircuit-1crdasmao-tscircuit.vercel.app/


I tested 
```ts
<board routingDisabled>
    <voltagesource name="V1" voltage="15V" schX={-3} />
    <ammeter
      name="AM1"
      color="#ff0000"
      graphDisplayName="I_LOAD"
      connections={{
        pos: ".V1 > .pin1",
        neg: ".R1 > .pin1",
      }}
    />
    <resistor name="R1" resistance="2" schX={3} footprint="0402" />

    <trace from=".R1 > .pin2" to=".V1 > .pin2" />

    <voltageprobe
      name="VOUT"
      color="#315cff"
      connectsTo=".R1 > .pin1"
      referenceTo=".V1 > .pin2"
    />

    <analogsimulation
      duration="1ms"
      timePerStep="100us"
      spiceEngine="ngspice"
    />
  </board>
```
Attachment: image.png — https://community.tscircuit.com/media/1520064291661807686
Attachment: image.png — https://community.tscircuit.com/media/1520064292123054090

## shibo — 2026-06-26T13:53:32.744000+00:00

cool

## shibo — 2026-06-26T13:57:25.767000+00:00

<@809856037376491570> https://github.com/tscircuit/svg.tscircuit.com/pull/1686

## shibo — 2026-06-26T14:34:05.437000+00:00

<@757706909351411845>

## shibo — 2026-06-27T11:19:31.834000+00:00

<@452450065941004289> can you double check it it worked in the live deployment?

## ! Rushabh | Linux Shill — 2026-06-27T12:07:57.656000+00:00

Yes, Its is not working for svg.tscircuit.com , but it works in https://svg-tscircuit-2mm13se43-tscircuit.vercel.app/

hey <@809856037376491570> is there any difference of environment between these two links in vercel

## ! Rushabh | Linux Shill — 2026-06-27T12:08:17.166000+00:00

pr:https://github.com/tscircuit/svg.tscircuit.com/pull/1686

## Rishabh — 2026-06-27T12:13:00.625000+00:00

The last deployment has failed, run `build` locally to figure out
Attachment: image.png — https://community.tscircuit.com/media/1520401564068741200

## shibo — 2026-06-27T16:03:36.952000+00:00

<@452450065941004289> what is this commit?
Attachment: image.png — https://community.tscircuit.com/media/1520459597457133821

## shibo — 2026-06-27T16:03:56.613000+00:00

it's not the latest

## ! Rushabh | Linux Shill — 2026-06-27T16:34:28.894000+00:00

check this dd0e34c

## ! Rushabh | Linux Shill — 2026-06-27T16:34:55.024000+00:00

https://github.com/tscircuit/svg.tscircuit.com/actions/runs/28257068828

## ! Rushabh | Linux Shill — 2026-06-27T16:35:26.786000+00:00

this is newer commit on my test branch

## shibo — 2026-06-27T16:37:44.905000+00:00

the thing is that main builds locally, why does it not build in vercel? maybe it does actually build if the snapshot sent by <@809856037376491570> is not from main

## ! Rushabh | Linux Shill — 2026-06-27T16:38:09.819000+00:00

that one is not from main

## ! Rushabh | Linux Shill — 2026-06-27T16:39:09.387000+00:00

it also fails locally , its just something i was testing locally, the build started cause i created a pr as i wanted to know how it behaves in prod

## ! Rushabh | Linux Shill — 2026-06-27T16:39:42.302000+00:00

<@809856037376491570> needs to see the latest build on main branch

## Rishabh — 2026-06-27T16:40:03.977000+00:00

what's happening here

## Rishabh — 2026-06-27T16:40:10.140000+00:00

Ohh I sent the wrong one?

## ! Rushabh | Linux Shill — 2026-06-27T16:40:26.962000+00:00

[attachment]
Attachment: image.png — https://community.tscircuit.com/media/1520468867158245376

## Rishabh — 2026-06-27T16:40:39.002000+00:00

yeah, I sent the preview deployment which failed. the main is passing
Attachment: image.png — https://community.tscircuit.com/media/1520468917682831430

## ! Rushabh | Linux Shill — 2026-06-27T16:41:29.047000+00:00

but sch sim is not working for svg.tscircuit.com , but it works in https://svg-tscircuit-2mm13se43-tscircuit.vercel.app/

## shibo — 2026-06-27T16:41:51.447000+00:00

you gotta reproduce somehow

## shibo — 2026-06-27T16:41:58.829000+00:00

at least now we know it's not a build issue

## ! Rushabh | Linux Shill — 2026-06-27T16:43:41.253000+00:00

we need to improve the error mesage so we can understand the problem better
Attachment: image.png — https://community.tscircuit.com/media/1520469682191073330

## shibo — 2026-06-27T16:52:40.386000+00:00

you got a PR?

## ! Rushabh | Linux Shill — 2026-06-27T16:53:07.011000+00:00

yeah, on it

## ! Rushabh | Linux Shill — 2026-06-27T17:37:27.701000+00:00

So here is what i found
I added better errros https://github.com/tscircuit/svg.tscircuit.com/pull/1688

live link i got for my pr (works perfectly fine): https://svg-tscircuit-6ty0d4oh2-tscircuit.vercel.app/
my vercel deployment of the same branch (errors): https://svg-tscircuit-pxjw8v8l2-rushabh1134s-projects.vercel.app/
Attachment: image.png — https://community.tscircuit.com/media/1520483214840299732

## ! Rushabh | Linux Shill — 2026-06-27T17:38:59.576000+00:00

<@809856037376491570> any idea why this might occur

## Seve — 2026-06-27T17:40:33.746000+00:00

Try redeploy? Upgraded node to 24
Attachment: image0.jpg — https://community.tscircuit.com/media/1520483995123453972

## ! Rushabh | Linux Shill — 2026-06-27T17:42:04.005000+00:00

i am already using node 24.x in my deployment

## Seve — 2026-06-27T17:42:48.584000+00:00

I updated the svg tscircuit com setting- that is the point

## Seve — 2026-06-27T17:43:08.195000+00:00

Now it matches your version, but needs an update to redeploy