Add Prevent erb_lint From Removing Opening Tags as a Ruby TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1455 TILs and counting..._
+_1456 TILs and counting..._
 
 ---
 
@@ -1212,6 +1212,7 @@ _1455 TILs and counting..._
 - [Pattern Match Values From A Hash](ruby/pattern-match-values-from-a-hash.md)
 - [Percent Notation](ruby/percent-notation.md)
 - [Precedence Of Logical Operators](ruby/precedence-of-logical-operators.md)
+- [Prevent erb_lint From Removing Opening Tags](ruby/prevent-erb-lint-from-removing-opening-tags.md)
 - [Print Data To Formatted Table](ruby/print-data-to-formatted-table.md)
 - [Question Mark Operator](ruby/question-mark-operator.md)
 - [Rake Only Lists Tasks With Descriptions](ruby/rake-only-lists-tasks-with-descriptions.md)

ruby/prevent-erb-lint-from-removing-opening-tags.md

@@ -0,0 +1,45 @@
+# Prevent erb_lint From Removing Opening Tags
+
+The [`erb_lint` gem](https://github.com/Shopify/erb_lint) is a tool from
+shopify for linting and auto-formatting ERB files. When I first set it up in a
+Rails codebase with the base `.erb-lint.yml` recommended in the README, I ran
+into a pernicious issue. The linter wanted to remove opening tags (i.e. `<%`
+and `<%=`) from my ERB files.
+
+So, for a file that looked like this:
+
+```erb
+<div>
+  <%= form_with(url: login_path, scope: :session) do |f| %>
+    <div>
+      <%= f.label :email %>
+      <%= f.email_field :email %>
+    </div>
+</div>
+```
+
+It would get formatted to this:
+
+```erb
+<div>
+form_with(url: login_path, scope: :session) do |f| %>
+    <div>
+f.label :email %>
+f.email_field :email %>
+    </div>
+</div>
+```
+
+Yikes!
+
+I had to disable a couple rules (under `rubocop_config:`) in the `.erb-lint.yml` file to get it to stop
+doing this.
+
+```yaml
+Layout/InitialIndentation:
+  Enabled: false
+Layout/TrailingEmptyLines:
+  Enabled: false
+```
+
+[source](https://github.com/Shopify/erb_lint/issues/222)