Add conditionalGroup to allow manually specifying multiple representations of a document; use it to support expanding last parameter of functions

tests/arraylib/__snapshots__/jsfmt.spec.js.snap

@@ -69,22 +69,18 @@ function from_test() {
 function foo(x: string) {}
 
 var a = [ 0 ];
-var b = a.map(
-  function(x) {
-    foo(x);
+var b = a.map(function(x) {
+  foo(x);
 
-    return \"\" + x;
-  }
-);
+  return \"\" + x;
+});
 var c: number = a[0];
 var d: number = b[0];
 var e: Array<string> = a.reverse();
 var f = [ \"\" ];
-var g: number = f.map(
-  function() {
-    return 0;
-  }
-)[0];
+var g: number = f.map(function() {
+  return 0;
+})[0];
 var h: Array<number> = [ 1, 2, 3 ];
 var i: Array<string> = [ \"a\", \"b\", \"c\" ];
 var j: Array<number | string> = h.concat(i);
@@ -94,29 +90,20 @@ var m: Array<number | string> = h.concat(\"a\", \"b\", \"c\");
 var n: Array<number> = h.concat(\"a\", \"b\", \"c\");
 
 function reduce_test() {
-  [ 0, 1, 2, 3, 4 ].reduce(
-    function(previousValue, currentValue, index, array) {
-      return previousValue + currentValue + array[index];
-    }
-  );
+  [ 0, 1, 2, 3, 4 ].reduce(function(previousValue, currentValue, index, array) {
+    return previousValue + currentValue + array[index];
+  });
 
-  [ 0, 1, 2, 3, 4 ].reduce(
-    function(previousValue, currentValue, index, array) {
+  [ 0, 1, 2, 3, 4 ].reduce(function(previousValue, currentValue, index, array) {
       return previousValue + currentValue + array[index];
-    },
-    10
-  );
+    }, 10);
 
-  var total = [ 0, 1, 2, 3 ].reduce(
-    function(a, b) {
-      return a + b;
-    }
-  );
-  var flattened = [ [ 0, 1 ], [ 2, 3 ], [ 4, 5 ] ].reduce(
-    function(a, b) {
-      return a.concat(b);
-    }
-  );
+  var total = [ 0, 1, 2, 3 ].reduce(function(a, b) {
+    return a + b;
+  });
+  var flattened = [ [ 0, 1 ], [ 2, 3 ], [ 4, 5 ] ].reduce(function(a, b) {
+    return a.concat(b);
+  });
 
   [ \"\" ].reduce((acc, str) => acc * str.length);
 
@@ -124,18 +111,12 @@ function reduce_test() {
 }
 
 function from_test() {
-  var a: Array<string> = Array.from(
-    [ 1, 2, 3 ],
-    function(val, index) {
-      return (index % 2 ? \"foo\" : String(val));
-    }
-  );
-  var b: Array<string> = Array.from(
-    [ 1, 2, 3 ],
-    function(val) {
-      return String(val);
-    }
-  );
+  var a: Array<string> = Array.from([ 1, 2, 3 ], function(val, index) {
+    return (index % 2 ? \"foo\" : String(val));
+  });
+  var b: Array<string> = Array.from([ 1, 2, 3 ], function(val) {
+    return String(val);
+  });
 }
 "
 `;