fix: add more lenient parsing for code blocks, to accept newlines #2105

[nperez0111]

Summary

I only validated that this did what I expected, I do not think that this is actually complete, we should add tests for this specific behavior.

Closes #2105

Rationale

This allows us to more leniently parse existing code blocks from arbitrary HTML in a way which is more user-friendly.

Changes

Impact

Testing

Screenshots/Video

Checklist

• Code follows the project's coding standards.
• Unit tests covering the new feature have been added.
• All existing tests pass.
• The documentation has been updated to reflect the new feature

Additional Notes

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Preview	Updated (UTC)
blocknote	Ready	Preview	Oct 24, 2025 3:31pm
blocknote-website	Ready	Preview	Oct 24, 2025 3:31pm

[pkg-pr-new]

Open in StackBlitz

@blocknote/ariakit

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/ariakit@2108

@blocknote/code-block

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/code-block@2108

@blocknote/core

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/core@2108

@blocknote/mantine

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/mantine@2108

@blocknote/react

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/react@2108

@blocknote/server-util

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/server-util@2108

@blocknote/shadcn

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/shadcn@2108

@blocknote/xl-ai

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-ai@2108

@blocknote/xl-docx-exporter

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-docx-exporter@2108

@blocknote/xl-email-exporter

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-email-exporter@2108

@blocknote/xl-multi-column

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-multi-column@2108

@blocknote/xl-odt-exporter

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-odt-exporter@2108

@blocknote/xl-pdf-exporter

npm i https://pkg.pr.new/TypeCellOS/BlockNote/@blocknote/xl-pdf-exporter@2108

commit: 9fc3acf

[matthewlipski]

Alright I think a single test case to cover multi-line <pre><code> elements should be enough to prevent regressions. Otherwise I think this change looks good.

The one thing I was hesitant about was that blocks generally mark newlines with a line break node, but the parsed code block content is just one big multi-line string. But then I saw that it's because of the code: true in the spec, so no issue there.

[matthewlipski]

@nperez0111 do you want me to add tests for this or are you good? Also