Handle comments in assignments before template literals (#4580)

Closes #4560

src/language-js/comments.js

@@ -696,10 +696,13 @@ function handleVariableDeclaratorComments(
 ) {
   if (
     enclosingNode &&
-    enclosingNode.type === "VariableDeclarator" &&
+    (enclosingNode.type === "VariableDeclarator" ||
+      enclosingNode.type === "AssignmentExpression") &&
     followingNode &&
     (followingNode.type === "ObjectExpression" ||
-      followingNode.type === "ArrayExpression")
+      followingNode.type === "ArrayExpression" ||
+      followingNode.type === "TemplateLiteral" ||
+      followingNode.type === "TaggedTemplateExpression")
   ) {
     addLeadingComment(followingNode, comment);
     return true;

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

@@ -1757,6 +1757,24 @@ let obj = [
   // Comment
   'val'
 ]
+
+let obj = // Comment
+\`val\`;
+
+let obj = // Comment
+\`
+val
+val
+\`;
+
+let obj = // Comment
+tag\`val\`;
+
+let obj = // Comment
+tag\`
+val
+val
+\`;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 let obj =
   // Comment
@@ -1798,4 +1816,26 @@ let obj = [
   "val"
 ];
 
+let obj =
+  // Comment
+  \`val\`;
+
+let obj =
+  // Comment
+  \`
+val
+val
+\`;
+
+let obj =
+  // Comment
+  tag\`val\`;
+
+let obj =
+  // Comment
+  tag\`
+val
+val
+\`;
+
 `;

tests/comments/variable_declarator.js

@@ -35,3 +35,21 @@ let obj = [
   // Comment
   'val'
 ]
+
+let obj = // Comment
+`val`;
+
+let obj = // Comment
+`
+val
+val
+`;
+
+let obj = // Comment
+tag`val`;
+
+let obj = // Comment
+tag`
+val
+val
+`;