Can't Load custom theme.json with Shikiji

[alvarosabu]

Describe the bug
Hi, when I try to load my custom theme.json that I used for shiki before:

import { defineShikijiSetup } from '@slidev/types'

const myTheme = JSON.parse(fs.readFileSync('setup/theme/penguin-theme.json', 'utf8'))

export default defineShikijiSetup(() => ({
  theme: myTheme,
}))

It throws an error:

file:///Users/alvarosabu/Projects/alvarosabu/talks/slidev-theme-penguin/node_modules/.pnpm/shikiji-core@0.9.19/node_modules/shikiji-core/dist/index.mjs:5030
                    throw new Error(`[shikiji] Theme \`${theme}\` is not built-in.`);
                          ^

Error: [shikiji] Theme `theme-penguin` is not built-in.
    at resolveTheme (file:///Users/alvarosabu/Projects/alvarosabu/talks/slidev-theme-penguin/node_modules/.pnpm/shikiji-core@0.9.19/node_modules/shikiji-core/dist/index.mjs:5030:27)
    at file:///Users/alvarosabu/Projects/alvarosabu/talks/slidev-theme-penguin/node_modules/.pnpm/shikiji-core@0.9.19/node_modules/shikiji-core/dist/index.mjs:5035:57
    at Array.map (<anonymous>)
    at getHighlighter (file:///Users/alvarosabu/Projects/alvarosabu/talks/slidev-theme-penguin/node_modules/.pnpm/shikiji-core@0.9.19/node_modules/shikiji-core/dist/index.mjs:5035:48)

Is it currently possible to load custom themes? Thanks

To Reproduce
Steps to reproduce the behavior:

1. npm run dev

Desktop (please complete the following information):

• OS: MacOS
• Browser: None
• Slidev version: v0.46.3

[antfu]

Can you share a minimal repro? Thanks

[alvarosabu]

Yes sorry, here is it https://stackblitz.com/edit/vitejs-vite-fm6jjj?file=setup%2Fshikiji.ts

[antfu]

Before the release, here is the workaround:

import fs from 'node:fs';

/* ./setup/shiki.ts */

import { defineShikijiSetup } from '@slidev/types';

const myTheme = JSON.parse(
  fs.readFileSync('setup/theme/penguin-theme.json', 'utf8')
);

export default defineShikijiSetup(() => ({
  themes: { default: myTheme },
  defaultColor: 'default',
}));

[alvarosabu]

Thanks @antfu that was extremely quick 🙏🏻