*.html.erb tends to get ugly and inconsistent.

Luckily, Shopify has created some good static-code-analysis libraries, that scan your ERB or HTML and show/correct style errors.

Think “Rubocop for *.html.erb”:

At work I use only the erb-lint one.

Here’s how you can install, configure, and use the erb-lint gem:

# Gemfile
group :development, :test do
  gem "erb_lint", require: false
end

# console
echo > .erb-lint.yml

To run ERB Lint locally, use any one of the following:

# find issues 
bundle exec erblint --lint-all
# find issues and autocorrect
bundle exec erblint --lint-all --autocorrect
bundle exec erblint -la -a

My erb linter looks like this:

# .erb-lint.yml
---
EnableDefaultLinters: false
linters:
  Rubocop:
    enabled: true
    exclude:
      - "**/vendor/**/*"
      - "**/vendor/**/.*"
      - "bin/**"
      - "db/**/*"
      - "spec/**/*"
      - "config/**/*"
      - "node_modules/**/*"
    rubocop_config:
      inherit_from:
        - .rubocop.yml
      Layout/InitialIndentation:
        Enabled: false
      Layout/TrailingEmptyLines:
        Enabled: false
      Layout/TrailingWhitespace:
        Enabled: false
      Naming/FileName:
        Enabled: false
      Style/FrozenStringLiteralComment:
        Enabled: false
      Layout/LineLength:
        Enabled: false
      Lint/UselessAssignment:
        Enabled: false
      Layout/FirstHashElementIndentation:
        Enabled: false

You can find how to set up Github CI/CD to run the linter in this post: Rubocop with Github Actions