es6/7 class parsing failure - property declarations without semicolons - [bounty][test repo available]

[rosskevin]

version: 0.26.0

Bug description

This shows an ES2015/ES6/ES7 parsing bug - it will fail if there isn't a semicolon or static method after property declarations and before the first member method.

I first found in the test case that a constructor without a static method above it causes linting to fail on the first method with ^^^^^^^^^^^ Unexpected identifier. After suggestion, I tried adding a semicolon which proves the parsing error.

flowconfig

Same results with and without the following:

esproposal.class_static_fields=enable
esproposal.class_instance_fields=enable

Test cases

https://github.com/rosskevin/react-flow-classes

Works (static method above)

// @flow
import React from 'react'

type DefaultProps = { x: 1 }
type Props = { x: number }
type State = { y: number }

class Foo extends React.Component {
  props:Props
  state:State
  static defaultProps:DefaultProps

  static bar ():void {}

  constructor (props) {
    super(props)
  }

  render () {
    return <div>Hello World</div>
  }
}

Fails (no static method above)

// @flow
import React from 'react'

type DefaultProps = { x: 1 }
type Props = { x: number }
type State = { y: number }

class Foo extends React.Component {
  props:Props
  state:State
  static defaultProps:DefaultProps

  // fails without this static method above constructor
  //static bar ():void {}

  constructor (props) {
    super(props)
  }

  render () {
    return <div>Hello World</div>
  }
}

Works (a single semicolon)

// @flow
import React from 'react'

type DefaultProps = { x: 1 }
type Props = { x: number }
type State = { y: number }

class Foo extends React.Component {
  props:Props
  state:State
  static defaultProps:DefaultProps;

  // fails without this static method or semicolon above first constructor/member method
  //static bar ():void {}

  constructor (props) {
    super(props)
  }

  render () {
    return <div>Hello World</div>
  }
}

I proved the same in the sample repo with parameterized classes. May be related to #1171
cc @STRML

Expectation

All current failing classes in the test repo should succeed. I should not need to use any semicolons, and I don't need static methods above my constructor or member method.

[STRML]

I think there may still be some odd parsing rules with semicolons, try
that?
On Jun 8, 2016 5:46 PM, "Kevin Ross" notifications@github.com wrote:

version: 0.26.0

I'm at a loss, where I can get one thing to work, I cannot get a
combination of Props and State to work. I found in the test case that a
constructor without a static method above it causes linting to fail on
the first method with ^^^^^^^^^^^ Unexpected identifier

https://github.com/rosskevin/react-flow-classes
Works

// @flowimport React from 'react'

type DefaultProps = { x: 1 }
type Props = { x: number }
type State = { y: number }
class Foo extends React.Component {
props:Props
state:State
static defaultProps:DefaultProps

static bar ():void {}

constructor (props) {
super(props)
}

render () {
return

Hello World

}
}

Fails

// @flowimport React from 'react'

type DefaultProps = { x: 1 }
type Props = { x: number }
type State = { y: number }
class Foo extends React.Component {
props:Props
state:State
static defaultProps:DefaultProps

// fails without this static method above constructor
//static bar ():void {}

constructor (props) {
super(props)
}

render () {
return

Hello World

}
}

I proved the same with parameterized classes. May be related to #1171
#1171
cc @STRML https://github.com/STRML

—
You are receiving this because you were mentioned.
Reply to this email directly, view it on GitHub
#1908, or mute the thread
https://github.com/notifications/unsubscribe/ABJFP6RZmGKyKVdvEVKn3Sfay63tIXI1ks5qJ0ZRgaJpZM4IxXs8
.

[rosskevin]

Indeed a single semicolon and it works (repo updated):
rosskevin/react-flow-classes@3c56fd9