Configure Mermaid

Create ./setup/mermaid.ts with the following content:

import { defineMermaidSetup } from '@slidev/types'

export default defineMermaidSetup(() => {
  return {
    theme: 'forest',
  }
})

The return value should be the custom configs for Mermaid. Refer to the Mermaid documentation or the type definition for the full config list.

Custom theme/styles

In case you want to create your custom Mermaid themes or styles, you can do this by defining themeVariables like in the following example:

import { defineMermaidSetup } from '@slidev/types'

export default defineMermaidSetup(() => {
  return {
    theme: 'base',
    themeVariables: {
      // General theme variables
      noteBkgColor: '#181d29',
      noteTextColor: '#F3EFF5cc',
      noteBorderColor: '#404551',

      // Sequence diagram variables
      actorBkg: '#0E131F',
      actorBorder: '#44FFD2',
      actorTextColor: '#F3EFF5',
      actorLineColor: '#F3EFF5',
      signalColor: '#F3EFF5',
      signalTextColor: '#F3EFF5',
    }
  }
})

You can find all theme variables on the Mermaid Theme Configuration page.