MDS009: single-trailing-newline

File must end with exactly one newline character.

# Config

Enable:

rules:
  single-trailing-newline: true

Disable:

rules:
  single-trailing-newline: false

# Examples

# Good

# Title

Content here.

The file ends with exactly one \n after the last line.

# Bad

# Title

Content here.

The file has no trailing newline after the last line. The <?include?> output looks identical because the wrap always adds a newline, but the actual fixture file (bad/default.md) ends without one — that missing byte is what the rule detects.

# Meta-Information

• ID: MDS009
• Name: single-trailing-newline
• Status: ready
• Default: enabled
• Fixable: yes
• Implementation: source
• Category: whitespace
• markdownlint: MD047 (single-trailing-newline)
• rumdl: MD047 (file-end-newline)
• mado: MD047 (single-trailing-newline)
• obsidian-linter: line-break-at-document-end
• gomarklint: final-blank-line