tailwindcss-language-server crashes on projects using #/* Node.js package imports

[youyoumu]

What version of Tailwind CSS IntelliSense are you using?

"@tailwindcss/language-server": "^0.14.29",

What version of Tailwind CSS are you using?

"tailwindcss": "^4.3.0",

What package manager are you using?

pnpm

What operating system are you using?

Linux, NixOS

Tailwind CSS Stylesheet (v4) or config file (v3)

main.css

@layer theme, base, components, utilities.daisyui.component;
@import "tailwindcss";
@import "./daisyui.css";
@import "./theme.css";
@import "./base.css";
@import "./components.css";
@import "./utilities.css";
@import "./tailwind-property.css";
@import "./dictionary.css";
@import "./configurable.css";
@source "..";
/*...*/

daisyui.css

@plugin "./daisyui-shim.ts" {
  root: "#kiku-root";
  themes: all;
  include:
    properties, reset, rootcolor, rootscrollgutter, rootscrolllock, svg, scrollbar, button, input,
    label, fieldset, select, alert, badge, toast, collapse, status, toggle, list, loading, range,
    tooltip, divider, modal, indicator, tab;
}
/*...*/

daisyui-shim.ts

import type { PluginAPI } from "tailwindcss/plugin";
import daisyui from "daisyui";
import { daisyUIThemes, type DaisyUITheme } from "#/src/lib/theme";
type CssInJs = Parameters<PluginAPI["addBase"]>[0];
//...

package.json

{
  "name": "@repo/note",
  "version": "1.10.2",
  "private": true,
  "type": "module",
  "imports": {
    "#/*": "./*"
  }
}

Describe your issue

The language server crashes with

{
      "jsonrpc": "2.0",
      "method": "window/logMessage",
      "params": {
        "type": 1,
        "message": "Unable to load plugin: ./daisyui-shim.ts Error: Request should not start with \"#/\"\n    at PAe (/home/yym/repos/kiku/node_modules/.pnpm/@tailwindcss+language-server@0.14.29/node_modules/@tailwindcss/language-server/bin/tailwindcss-language-serve

The LSP bundles enhanced-resolve@^5.16.1. The function assertImportsFieldRequest in lib/util/entrypoints.js rejects import specifiers starting with #/,

function PAe(e) {
  if (e.charCodeAt(0) !== xAe) throw new Error('Request should start with "#"');
  if (e.length === 1) throw new Error("Request should have at least 2 characters");
  if (e.charCodeAt(1) === Rd) throw new Error('Request should not start with "#/"');
  if (e.charCodeAt(e.length - 1) === Rd) throw new Error("Only requesting file allowed");
  return e.slice(1);
} 

Node.js allow subpath import since nodejs/node#60864.
And enhanced-resolve allow them as valid subpath import patterns since webpack/enhanced-resolve#468, released in v5.18.4 .

Suggested fix

Bump the bundled enhanced-resolve from ^5.16.1 to ^5.18.4 (or later)

[nick-delirium]

I think my issue is related so I will add here. Whenever I open project with this plugin enabled, it will spawn endless processes from @tailwindcss/.../oxide-helper.js or tailwindcss-language-server which freezes my entire machine. Happens in zed and vscode.