verify the precedingNode type when handling import declaration comments (#5016)

src/language-js/comments.js

@@ -660,6 +660,7 @@ function handleImportDeclarationComments(
 ) {
   if (
     precedingNode &&
+    precedingNode.type === "ImportSpecifier" &&
     enclosingNode &&
     enclosingNode.type === "ImportDeclaration" &&
     privateUtil.hasNewline(text, options.locEnd(comment))

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

@@ -95,6 +95,11 @@ import {
   SelectionSetNode,
   /* tslint:enable */
 } from 'graphql';
+
+import x, {
+  // comment
+  y
+} from 'z';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import {
   //comment1
@@ -139,6 +144,11 @@ import {
   /* tslint:enable */
 } from "graphql";
 
+import x, {
+  // comment
+  y
+} from "z";
+
 `;
 
 exports[`comments.js - flow-verify 2`] = `
@@ -182,6 +192,11 @@ import {
   SelectionSetNode,
   /* tslint:enable */
 } from 'graphql';
+
+import x, {
+  // comment
+  y
+} from 'z';
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 import {
   //comment1
@@ -226,6 +241,11 @@ import {
   /* tslint:enable */
 } from "graphql";
 
+import x, {
+  // comment
+  y
+} from "z";
+
 `;
 
 exports[`empty-import.js - flow-verify 1`] = `

tests/import/comments.js

@@ -38,3 +38,8 @@ import {
   SelectionSetNode,
   /* tslint:enable */
 } from 'graphql';
+
+import x, {
+  // comment
+  y
+} from 'z';