fix: keep the key when t from useLingui is used as a shorthand property

crates/lingui_macro/src/lib.rs

@@ -50,6 +50,21 @@ impl Fold for IdentReplacer {
 
         n
     }
+
+    /// In a shorthand property `{ t }` the same identifier is both the key
+    /// and the value. Expand it to `{ t: $__ }` so the key is preserved.
+    fn fold_prop(&mut self, n: Prop) -> Prop {
+        if let Prop::Shorthand(ident) = &n {
+            if ident.to_id() == self.from {
+                return Prop::KeyValue(KeyValueProp {
+                    key: PropName::Ident(IdentName::new(ident.sym.clone(), ident.span)),
+                    value: Box::new(Expr::Ident(self.to.clone())),
+                });
+            }
+        }
+
+        n.fold_children_with(self)
+    }
 }
 
 pub struct LinguiMacroFolder<C>

crates/lingui_macro/tests/snapshots/use_lingui__support_passing_t_in_shorthand_object_property.snap

@@ -0,0 +1,19 @@
+---
+source: crates/lingui_macro/tests/use_lingui.rs
+---
+import { useLingui } from '@lingui/react/macro';
+
+function useGreeting(format) {
+  const { t } = useLingui();
+  return format({ t });
+}
+
+↓ ↓ ↓ ↓ ↓ ↓
+
+import { useLingui as $_useLingui } from "@lingui/react";
+function useGreeting(format) {
+    const { _: $__ } = $_useLingui();
+    return format({
+        t: $__
+    });
+}

crates/lingui_macro/tests/use_lingui.rs

@@ -168,3 +168,15 @@ function MyComponent() {
 }
      "#
 );
+
+to!(
+    support_passing_t_in_shorthand_object_property,
+    r#"
+import { useLingui } from '@lingui/react/macro';
+
+function useGreeting(format) {
+  const { t } = useLingui();
+  return format({ t });
+}
+     "#
+);