Add parenthesis for binary expression inside of as (#1682)

src/fast-path.js

@@ -332,6 +332,7 @@ FPp.needsParens = function() {
         case "SpreadElement":
         case "SpreadProperty":
         case "AwaitExpression":
+        case "TSAsExpression":
           return true;
 
         case "MemberExpression":

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

@@ -2,7 +2,9 @@
 
 exports[`as.js 1`] = `
 const name = (description as DescriptionObject).name || (description as string);
+this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 const name = (description as DescriptionObject).name || description as string;
+this.isTabActionBar((e.target || e.srcElement) as HTMLElement);
 
 `;

tests/typescript_as/as.js

@@ -1 +1,2 @@
 const name = (description as DescriptionObject).name || (description as string);
+this.isTabActionBar((e.target || e.srcElement) as HTMLElement);