To configure a code block highlighting theme and language, you can extend the editor's default schema with a new codeBlock, which you can pass options into when creating. You can then use a shiki highlighter to add custom syntax highlighting.

First use the shiki-codegen CLI to create a shiki.bundle.ts file. You can then pass this file into the codeBlock options when creating it.

Relevant Docs:

• Code Blocks
• shiki-codegen
• Custom Schema