fix(js): quote property name as es5 compatible (#5157)

src/language-js/printer-estree.js

@@ -28,7 +28,7 @@ const {
   isNextLineEmptyAfterIndex,
   getNextNonSpaceNonCommentCharacterIndex
 } = require("../common/util-shared");
-const isIdentifierName = require("esutils").keyword.isIdentifierNameES6;
+const isIdentifierName = require("esutils").keyword.isIdentifierNameES5;
 const embed = require("./embed");
 const clean = require("./clean");
 const insertPragma = require("./pragma").insertPragma;

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

@@ -30,6 +30,36 @@ function b(object, key) {
 
 `;
 
+exports[`objects.js - flow-verify 1`] = `
+const obj = {
+ 'a': true,
+ b: true,
+ "𐊧": true,
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+const obj = {
+  a: true,
+  b: true,
+  "𐊧": true
+};
+
+`;
+
+exports[`objects.js - flow-verify 2`] = `
+const obj = {
+ 'a': true,
+ b: true,
+ "𐊧": true,
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+const obj = {
+  a: true,
+  b: true,
+  '𐊧': true
+};
+
+`;
+
 exports[`strings.js - flow-verify 1`] = `
 // Prevent strings from being parsed as directives
 // See https://github.com/prettier/prettier/pull/1560#issue-227225960

tests/quotes/objects.js

@@ -0,0 +1,5 @@
+const obj = {
+ 'a': true,
+ b: true,
+ "𐊧": true,
+}