Unable to generate local formkit theme using formkit.theme.config.ts

[piscis]

Reproduction

https://cli-related.and.does.not.apply.example.com

Describe the bug

There seems to be an issue with the formkit CLI when creating a theme file from a formkit theme project.

formkit.theme.config.ts

import theTheme from '@myTheme/form-wizard-theme'
export default theTheme

if I use npx [email protected] theme --theme=./formkit.theme.config.ts or npx formkit@latest theme --theme=./formkit.theme.config.ts I receive the following error:

Output:

❯ npx [email protected] theme --theme=./formkit.theme.config.ts
npm WARN ignoring workspace config at /Users/xxx/app/.npmrc 
Locating ./formkit.theme.config.ts...
Found local theme file
node:internal/modules/esm/get_format:176
  throw new ERR_UNKNOWN_FILE_EXTENSION(ext, filepath);
        ^

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Users/xxx/app/formkit.theme.config.ts
    at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:176:9)
    at defaultGetFormat (node:internal/modules/esm/get_format:219:36)
    at defaultLoad (node:internal/modules/esm/load:143:22)
    at async ModuleLoader.load (node:internal/modules/esm/loader:555:7)
    at async ModuleLoader.moduleProvider (node:internal/modules/esm/loader:434:45)
    at async link (node:internal/modules/esm/module_job:87:21) {
  code: 'ERR_UNKNOWN_FILE_EXTENSION'
}

Node.js v20.18.0

However if I try to generate the theme with npx [email protected] theme --theme=./formkit.theme.config.ts it works.

Output:

❯ npx [email protected] theme --theme=./formkit.theme.config.ts
npm WARN ignoring workspace config at /Users/xxx/app/.npmrc 

Locating ./formkit.theme.config.ts...
Found local theme file
Loaded theme: BlaBla
Theme file written to formkit.theme.ts

Environment

• OS: MacOS 15.0.1
• CLI
• Version Node Version 20.18.0