mdrefine

style/final-newline ​

Ends a document that is not empty with a line break, using the document's own line ending. A file whose last line has no line break is changed; an empty file is not.

Style rule, fixed by format. Presets: recommended (warn). Dialects: all. Options: none.

Before, a document with Windows line endings, written as a JavaScript string, whose last line has none:

js
"# Notes\r\n\r\nThe last line."

After, the same line ending, \r\n, ends the last line too:

js
"# Notes\r\n\r\nThe last line.\r\n"

Edge cases and advanced usage ​

Left as written: a document whose added line break would become part of the last block: an HTML comment or another HTML block without its end marker, an Obsidian comment without its closing %%, or a code or math block without its closing fence whose last line is blank space.

Dialect notes ​

In Obsidian: nothing is added either where the document ends in a fenced code block without its closing fence, outside a list item or block quote: Reading view shows the line break as one more, empty line of the code. An HTML block opened in a list or quote can also lead Live Preview into code that the parser does not recognize; the original end stays where that code's closing boundary is uncertain.