Support Angular v21.2 (#18722)

tests/format/angular/expression/arrow-function.html

@@ -0,0 +1,25 @@
+@let fn = (a, b) =>   componentValue + a + b;
+One: {{fn(0, 1)}}
+
+@if (true) {
+  Two: {{fn(1, 1)}}
+
+  <button (click)="   componentValue = fn(2, 1)"></button>
+  <button (click)="   componentValue => fn(2, 1)"></button>
+}
+
+
+{{[(a) =>    a +    1][0](1000)}}
+{{[(a   ) => a + 1 +   componentProp][0](1000)}}
+
+
+@let a = 1;
+
+@if (true) {
+  @let b = 2;
+
+  @if (true) {
+    @let c = 3;
+    {{(() =>    a + b + c)()}}
+  }
+}