fix: correct showCellNumbers default and docs syntax error

[abhay-ramesh]

Changes

Two small correctness bugs caught during a codebase audit:

1. showCellNumbers default mismatch

NotebookLoader was defaulting showCellNumbers to true, but:

• The directive options table in the docs says the default is false
• NotebookCodeCell also defaults it to false
• The remark plugin passes no value when the attribute is absent, so the component default is what users actually get

This meant cell numbers appeared unexpectedly for anyone using the :::notebook directive without explicitly setting showCellNumbers.

Fix: Change the NotebookLoader default from true → false.

2. Missing comma in getMDXComponents docs example

The code snippet in the getting-started guide was missing a trailing comma:

// ❌ Before — syntax error
return {
  ...defaultMdxComponents,
  ...components    // ← missing comma
  ...notebookComponents,
}

// ✅ After
return {
  ...defaultMdxComponents,
  ...components,
  ...notebookComponents,
}

Copying this example verbatim produced a TypeScript compilation error.

Test plan

• Using :::notebook{file="..."} without showCellNumbers no longer shows cell numbers
• The docs example compiles without errors when copy-pasted

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
notebook-mdx	Ready	Preview, Comment	Mar 27, 2026 5:55pm