Linter Rule: `erb-hash-shorthand-syntax`

[marcoroth]

Rule: erb-hash-shorthand-syntax

Description

Enforce a consistent style for Ruby's hash value omission (shorthand hash syntax, Ruby >= 3.1) inside ERB tags, most visibly in render calls with a locals: hash.

The rule should be configurable through an enforcedStyle option:

• always (proposed default)
• never

Examples

With enforcedStyle: "always":

✅ Good

<%= render partial: "users/featured_talk", locals: { featured: } %>

<%= render partial: "users/featured_talk", locals: { featured:, speaker: } %>

<%= render partial: "users/featured_talk", locals: { featured: @featured } %>

<%= render partial: "users/featured_talk", locals: { talk: featured } %>

🚫 Bad

<%= render partial: "users/featured_talk", locals: { featured: featured } %>

<%= render partial: "users/featured_talk", locals: { featured: featured, speaker: speaker } %>

With enforcedStyle: "never":

✅ Good

<%= render partial: "users/featured_talk", locals: { featured: featured } %>

<%= render partial: "users/featured_talk", locals: { featured: featured, speaker: speaker } %>

🚫 Bad

<%= render partial: "users/featured_talk", locals: { featured: } %>

<%= render partial: "users/featured_talk", locals: { featured:, speaker: } %>

Notes

Depends on #1204

References

• Feature #14579: Hash value omission
• Ruby 3.1.0 release notes: value omission in hash literals
• RuboCop Style/HashSyntax (EnforcedShorthandSyntax)