Typegen fails when using custom icons in schema definitions

[Ayberkyvs]

Describe the bug

When using custom icons (i use lucide-react) in Sanity schema definitions, typegen fails with an Reference Error. Failed to load config file, require is not defined. The custom icon type is not recognized by the type generation tools.

$ sanity schema extract --enforce-required-fields --path=./sanity/extract.json && sanity typegen generate
✗ Failed to extract schema, with enforced required fields

ReferenceError: Failed to load configuration file "C:/Users/<path>/sanity.config.ts
":
require is not defined
    at file:///C:/Users/<path>/node_modules/lucide-react/dist/cjs/lucide-react.js:1
0:13
":
require is not defined
    at file:///C:/Users/<path>/node_modules/lucide-react/dist/cjs/lucide-react.js:1
":
require is not defined
":
":
require is not defined
    at file:///C:/Users/<path>/node_modules/lucide-react/dist/cjs/lucide-react.js:1
0:13
    at Object.newLoader [as .js] (C:/Users/<path>/node_modules/esbuild-register/dis
t/node.js:2262:9)
    at extensions..js (C:/Users/<path>/node_modules/esbuild-register/dist/node.js:4
833:24)
error Command failed with exit code 1.

To Reproduce

Steps to reproduce the behavior:

1. Go to 'schemaTypes/schema.ts'
2. Click on 'import and use HandPlatter icon'
3. Open terminal and 'yarn run dev'
4. See error

Expected behavior

typegen should recognize custom icons and generate types without errors.

Screenshots

Which versions of Sanity are you using?

@sanity/cli (global)  3.76.1 (latest: 3.76.3)
@sanity/image-url      1.1.0 (up to date)
@sanity/vision        3.76.1 (latest: 3.76.3)
sanity                3.76.1 (latest: 3.76.3)

What operating system are you using?

Windows 11 Pro (AtlasOS)

Which versions of Node.js / npm are you running?

Node: v22.14.0
Yarn: v1.22.22
Tested With: Node: 23.7.0 - 23.8.0, pnpm 9.15.7 - pnpm 10.4.0 

Additional context

I am using the Markdown plugin in my Sanity schema. I tried disabling and re-enabling the plugin, but the issue persists. This error did not occur in previous versions of Sanity. It seems to be related to the recent updates or changes in the type generation process.

Here’s how I integrated the Markdown plugin:

import { defineType } from 'sanity';
import { MarkdownIcon } from '@sanity/icons';

export default defineType({
  name: 'content',
  title: 'Content',
  type: 'markdown',
  icon: MarkdownIcon,
  validation: (Rule) => Rule.required().min(500),
});

Security issue?

No