Load Custom Themes

See All Builtin Themes first.

You can load custom themes by passing a Theme object into the themes array.

import { getHighlighter } from 'shiki'

const myTheme = {
  name: 'my-theme',
  settings: [
    {
      scope: ['comment'],
      settings: {
        foreground: '#888'
      }
    },
    // ...
  ]
}

const highlighter = await getHighlighter({
  themes: [myTheme],
  langs: [],
})

const code = `console.log('hello')`
const html = highlighter.codeToHtml(code, {
  lang: 'javascript',
  theme: 'my-theme'
})

You can also load themes after the highlighter has been created.

import { getHighlighter } from 'shiki'

// Load the theme object from a file, a network request, or anywhere
const myTheme = JSON.parse(fs.readFileSync('my-theme.json', 'utf8'))

const highlighter = await getHighlighter({
  langs: ['javascript'],
  themes: [],
})

await highlighter.loadTheme(myTheme) // <--

const code = `console.log('hello')`
const html = highlighter.codeToHtml(code, {
  lang: 'javascript',
  theme: 'my-theme'
})

The theme is a TextMate theme in JavaScript object. For example, it should look like this.