fix: expose createCssVariablesTheme in shiki/core to avoid side-e…

…ffects

docs/guide/theme-colors.md

@@ -99,7 +99,8 @@ Shiki provides a factory function helper `createCssVariablesTheme` for creating
 This theme is **not included by default** and must be registered explicitly:
 
 ```ts twoslash
-import { createCssVariablesTheme, createHighlighter } from 'shiki'
+import { createCssVariablesTheme } from 'shiki/core'
+import { createHighlighter } from 'shiki'
 
 // Create a custom CSS variables theme, the following are the default values
 const myTheme = createCssVariablesTheme({ // [!code hl:6]

packages/shiki/src/core.ts

@@ -1 +1,4 @@
 export * from '@shikijs/core'
+
+export type { CssVariablesThemeOptions } from './theme-css-variables'
+export { createCssVariablesTheme } from './theme-css-variables'

packages/shiki/src/index.ts

@@ -1,5 +1,2 @@
 export * from './bundle-full'
 export type { BuiltinLanguage, BuiltinTheme } from './types'
-
-export type { CssVariablesThemeOptions } from './theme-css-variables'
-export { createCssVariablesTheme } from './theme-css-variables'