Add rule to prefer if expressions over ternary operators in single-expression return values

README.md

@@ -1476,6 +1476,50 @@ _You can enable the following settings in Xcode by running [this script](https:/
 
   </details>
 
+- <a id='prefer-if-expressions-over-ternary-operators'></a>(<a href='#prefer-if-expressions-over-ternary-operators'>link</a>) **Prefer `if` expressions over ternary operators for single-expression return values.** Use ternary operators for conditions nested in other expressions, such as SwiftUI modifier conditions. Generally prefer `if` expressions for assignments after `=` operators.
+
+  <details>
+
+  <!-- ai-skill-include: autocorrect doesn't apply to conditional assignments after `=`, but this is still a good best practice -->
+
+  [![SwiftFormat: ifExpressions](https://img.shields.io/badge/SwiftFormat-ifExpressions-7B0051.svg)](https://swiftformat.info/rules/prerelease#ifExpressions)
+
+  ```swift
+  // WRONG
+  var destination: Planet {
+    spaceship.hasWarpDrive
+      ? .proximaCentauri
+      : .mars
+  }
+
+  // RIGHT
+  var destination: Planet {
+    if spaceship.hasWarpDrive {
+      .proximaCentauri
+    } else {
+      .mars
+    }
+  }
+
+  // ALSO RIGHT. Single-line ternaries are permitted.
+  var color: Color { spaceship.velocity > 0 ? .orange : .blue }
+
+  // ALSO RIGHT. Use ternaries for conditions nested in other expressions,
+  // like SwiftUI modifier conditions.
+  Image(.spaceship)
+    .foregroundStyle(spaceship.velocity > 0 ? .orange : .blue)
+
+  // PREFERRED. `if` expressions are also generally preferred over ternaries for assignments.
+  let destination: Planet =
+    if spaceship.hasWarpDrive {
+      .proximaCentauri
+    } else {
+      .mars
+    }
+  ```
+
+  </details>
+
 - <a id='wrap-if-statement-bodies'></a>(<a href='#wrap-if-statement-bodies'>link</a>) **Wrap `if` statement and `if` expression bodies onto multiple lines.**
 
   <details>

Sources/AirbnbSwiftFormatTool/airbnb.swiftformat

@@ -46,6 +46,7 @@
 --else-position same-line # elseOnSameLine
 --guard-else next-line # elseOnSameLine
 --single-line-for-each convert # preferForLoop
+--single-line-ternary preserve # ifExpressions
 --short-optionals always # typeSugar
 --semicolons never # semicolons
 --doc-comments preserve # docComments
@@ -125,6 +126,7 @@
 --rules sortTypealiases
 --rules preferForLoop
 --rules conditionalAssignment
+--rules ifExpressions
 --rules wrapMultilineConditionalAssignment
 --rules wrapFunctionBodies
 --rules wrapPropertyBodies