Describe the bug

When integrating @blocknote/core + @blocknote/code-block with a custom Shiki bundle, the type of CodeBlockOptions["createHighlighter"] from @blocknote/core is not compatible with the createHighlighter function returned by the Shiki packages that @blocknote/code-block depends on.

Concretely:

• @blocknote/core depends on @shikijs/types@3.13.0 and exposes:

  // node_modules/@blocknote/core/types/src/blocks/Code/block.d.ts import type { HighlighterGeneric } from "@shikijs/types"; export type CodeBlockOptions = { // ... createHighlighter?: () => Promise<HighlighterGeneric<any, any>>; };

• @blocknote/code-block depends on Shiki packages that pull in @shikijs/types@3.19.0 (in my app this is deduped to node_modules/@shikijs/types@3.19.0).

This means:

• CodeBlockOptions["createHighlighter"] expects a HighlighterGeneric coming from @blocknote/core/node_modules/@shikijs/types@3.13.0
• My custom Shiki bundle returns a HighlighterGeneric coming from node_modules/@shikijs/types@3.19.0

Even though the runtime shape is compatible, TypeScript treats these as two different, incompatible types, so I have to use as any to satisfy the BlockNote API.

To Reproduce

1. Install BlockNote core and code-block (current version):

npm install @blocknote/core@0.44.2 @blocknote/code-block@0.44.2

In the BlockNote repo, packages/core/package.json still has
"@shikijs/types": "3.13.0", while packages/code-block/package.json
pulls in Shiki packages that resolve to @shikijs/types@3.19.0 in my app.

2. Generate a custom Shiki bundle with shiki-codegen and use it from your app

3. Wire this highlighter into BlockNote:

   codeBlock: createCodeBlockSpec({ // Workaround: required due to @shikijs/types version mismatch createHighlighter: () => createHighlighter({ themes: ["light-plus", "dark-plus"], langs: [], }) as any, }),

4. Run TypeScript (tsc) – you will get a type error unless you add as any to the createHighlighter call.

Misc

• Node version: v24.12.0
• Package manager: npm 11.6.2
• Browser: -
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