Function isThemePreference

isThemePreference(
value: string,
): value is "dark" | "base" | "default" | "forest" | "neutral" | "system"
Type guard for supported Mermaid theme preferences.
Parameters
- value: string
  Raw preference value to check.
Returns value is "dark" | "base" | "default" | "forest" | "neutral" | "system"
True when the value is a supported preference.
- Defined in content/theme.ts:69