This rule is deprecated, and will eventually be removed.

Why is this an issue?

Trailing whitespaces bring no information, they may generate noise when comparing different versions of the same file, and they can create bugs when they appear after a \ marking a line continuation. They should be systematically removed.

An automated code formatter allows to completely avoid this family of issues and should be used wherever possible.

// The following string will error if there is a whitespace after '\'
var str = "Hello \
World";