Fix last comment of import (#1677)

We used to use isBlock as a heuristic but the real thing we want is to know if the comment is on its own line. Now it works with both :)

src/comments.js

@@ -173,6 +173,7 @@ function attach(comments, ast, text) {
         ) ||
         handleOnlyComments(enclosingNode, ast, comment, isLastComment) ||
         handleImportDeclarationComments(
+          text,
           enclosingNode,
           precedingNode,
           comment
@@ -726,6 +727,7 @@ function handleForComments(enclosingNode, precedingNode, comment) {
 }
 
 function handleImportDeclarationComments(
+  text,
   enclosingNode,
   precedingNode,
   comment
@@ -734,7 +736,7 @@ function handleImportDeclarationComments(
     precedingNode &&
     enclosingNode &&
     enclosingNode.type === "ImportDeclaration" &&
-    !util.isBlockComment(comment)
+    util.hasNewline(text, util.locEnd(comment))
   ) {
     addTrailingComment(precedingNode, comment);
     return true;

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

@@ -87,6 +87,14 @@ import {
   // FN4,
   // FN5
 } from "./module";
+
+import {
+  ExecutionResult,
+  DocumentNode,
+  /* tslint:disable */
+  SelectionSetNode,
+  /* tslint:enable */
+} from 'graphql';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import {
   //comment1
@@ -123,6 +131,14 @@ import {
   // FN5
 } from "./module";
 
+import {
+  ExecutionResult,
+  DocumentNode,
+  /* tslint:disable */
+  SelectionSetNode
+  /* tslint:enable */
+} from "graphql";
+
 `;
 
 exports[`comments.js 2`] = `
@@ -158,6 +174,14 @@ import {
   // FN4,
   // FN5
 } from "./module";
+
+import {
+  ExecutionResult,
+  DocumentNode,
+  /* tslint:disable */
+  SelectionSetNode,
+  /* tslint:enable */
+} from 'graphql';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import {
   //comment1
@@ -194,6 +218,14 @@ import {
   // FN5
 } from "./module";
 
+import {
+  ExecutionResult,
+  DocumentNode,
+  /* tslint:disable */
+  SelectionSetNode
+  /* tslint:enable */
+} from "graphql";
+
 `;
 
 exports[`long-line.js 1`] = `

tests/import/comments.js

@@ -30,3 +30,11 @@ import {
   // FN4,
   // FN5
 } from "./module";
+
+import {
+  ExecutionResult,
+  DocumentNode,
+  /* tslint:disable */
+  SelectionSetNode,
+  /* tslint:enable */
+} from 'graphql';