This issue was initially reported here:eslint/typescript-eslint-parser#594

What version of TypeScript are you using?
3.1.1

What version oftypescript-eslint-parser are you using?
21.0.2

What code were you trying to parse?

constRuleTester=require("eslint").RuleTester;construleTester=newRuleTester({parserOptions:{ecmaVersion:6,sourceType:"module",ecmaFeatures:{jsx:true,},},parser:"typescript-eslint-parser",});ruleTester.run("no-unused-vars",rule,{valid:[`const Foo = function () {}function render() {    return (<Foo />);}`,],invalid:[],})

What did you expect to happen?
The code should parse successfully, so I can test the rule.

What happened?
Parsing error: \'>\' expected.

see astexplorer repl
Note the parser has thejsx option set to true