RangeError: No value supplied for attribute start when parsing markdown with numbered lists

[sdip15fa]

Description

When using tryParseMarkdownToBlocks() to parse markdown content containing numbered lists, BlockNote throws a RangeError: No value supplied for attribute start error.

Error Stack Trace

RangeError: No value supplied for attribute start
    computeAttrs index.js:2051
    computeAttrs index.js:2167
    create index.js:2180
    enter index.js:3042
    addElementByRule index.js:2939
    addElement index.js:2884
    addDOM index.js:2792

Minimal Reproduction

import { useCreateBlockNote } from "@blocknote/react";

const editor = useCreateBlockNote();

const markdown = \`
1. First item
2. Second item
3. Third item
\`;

// This throws RangeError
const blocks = await editor.tryParseMarkdownToBlocks(markdown);

Root Cause Analysis

Based on investigation, the issue appears to be a schema mismatch:

• BlockNote's `numberedListItem` schema requires a `start` attribute
• The prosemirror-markdown parser provides an `order` attribute instead
• When ProseMirror tries to create the node, it fails because `start` is required but not supplied

Expected Behavior

Numbered lists should parse correctly without errors.

Actual Behavior

Parser throws `RangeError: No value supplied for attribute start`.

Workaround

Convert numbered lists to bullet lists before parsing:

const preprocessedContent = markdown.replace(/^(\s*)\d+\.\s/gm, "\$1* ");
const blocks = await editor.tryParseMarkdownToBlocks(preprocessedContent);

Environment

• BlockNote version: 0.41.1, 0.44.0
• React version: 19
• Browser: Firefox & Chrome
• OS: Linux

Related Issues

• editor.markdownToBlocks parse incorrectly #226 - editor.markdownToBlocks parse incorrectly
• MD parser broken #1711 - MD parser broken
• tryParseMarkdownToBlocks not parsing checklists #826 - tryParseMarkdownToBlocks not parsing checklists