Linter Rule: Enforce trailing newline
Rule: erb-requires-trailing-newline
Description
This rule enforces that all HTML+ERB template files end with exactly one trailing newline character. This is a formatting convention widely adopted across many languages and tools.
Rationale
Ensuring HTML+ERB files end with a single trailing newline aligns with POSIX conventions, where text files should end with a newline character.
This practice avoids unnecessary diffs from editors or formatters that auto-insert final newlines, improving compatibility with command-line tools and version control systems. It also helps maintain a clean, predictable structure across view files.
Trailing newlines are a common convention in Ruby and are enforced by tools like RuboCop and many Git-based workflows.
Examples
✅ Good
<%= render partial: "header" %>
<%= render partial: "footer" %>🚫 Bad
erb
<%= render partial: "header" %>
<%= render partial: "footer" %>▌