trailing-whitespace

Formatter: removes spaces and tabs at the end of a line.

Example#

doc.md:

A line that ends in spaces.   
The next line.

markright check reports:

doc.md:1: trailing whitespace (trailing-whitespace)
markright: 1 issue(s)

markright fmt rewrites it to:

A line that ends in spaces.
The next line.

Turning it off#

formatters:
  disable: [trailing-whitespace]

[formatters]
disable = ["trailing-whitespace"]

More in Rules.