JSX syntax highlighting breaks when using default values for destructred parameter

[chipit24]

• VSCode Version: Code 1.15.0 (8b95971, 2017-08-09T20:06:21.685Z)
• OS Version: Darwin x64 16.7.0
• Extensions:

Extension	Author (truncated)	Version
sort-lines	Tyr	1.3.0
project-manager	ale	0.19.0
path-intellisense	chr	1.4.2
vscode-eslint	dba	1.2.11
RelativePath	jak	1.0.0
cpptools	ms-	0.12.2
final-newline	sam	0.3.2
highlight-matching-tag	vin	0.4.4

(2 theme extensions excluded)

---

Steps to Reproduce:

1. Create a new file and set the language mode to "JavaScript React"
2. Add the following code:

const button = ({
  className
}) => (
  <div className={className}>
    Click me!
  </div>
);

3. Add a default value for className in the destructured object parameter:

const button = ({
  className = 'button'
}) => (
  <div className={className}>
    Click me!
  </div>
);

4. After this change, observe that JSX syntax highlighting is broken.
   

Reproduces without extensions: Yes

[mjbvz]

Thanks. This is already tracked upstream by microsoft/TypeScript-TmLanguage#499