小编vku*_*kin的帖子

为什么会出现这些错误flow.我正在使用React和ES6类.代码示例如下:

UPDATE

基于这个例子我几乎得到了这个工作:https: //flowtype.org/docs/react.html#defining-components-as-react-component-subclasses

我摆脱了大部分Flow错误,但现在app运行时失败了.我认为这是ReactJS没有剥离Flow或Babel类的东西.如果我在下面的代码中注释掉Flow类型defs,我不会收到此错误.

我正在运行我的应用程序 watchify -t [ babelify ] app.js -o ./build/app.js

SyntaxError:/Users/carlf/Documents/dev/reactjs/FlyTweet/app/views/posts/MyNewPostForm.js:缺少类属性转换.解析文件时:/Users/carlf/Documents/dev/reactjs/FlyTweet/app/views/posts/MyNewPostForm.js

流量错误:

app/views/posts/MyNewPostForm.js:51 51:var myPostTxt = ReactDOM.findDOMNode(this.Refs.content).value; ^^^^属性Refs.在15中找不到属性:导出默认类MyNewPostForm扩展React.Component {^^^^^^^^^^^^^ MyNewPostForm

来自package.json

  "dependencies": {
    "babel-preset-react": "6.5.0",
    "babelify": "7.3.0",
    "react": "15.1.0",
    "react-dom": "15.1.0",
    "react-router": "2.4.1"
  }

反应组件

export default class MyNewPostForm extends React.Component {

  // START Flow type definitions.
  MAX_POST_CHARS: number; 

  state: {
      charsRemaining: number,
      SendButtonDisabled: boolean
  };

  handleChange: () => void;
  onSubmit: () => void;
  // END Flow type definitions. …

1)有没有办法输入这个？2)任何人都能够解释这些错误消息？

let identity1: 'a => 'a = [%bs.raw {|
  function(value) {
    return value
  }
|}];

/*
Line 2, 11: The type of this expression, '_a -> '_a, contains type variables that cannot be generalized
*/

let identity2: 'a. 'a => 'a = [%bs.raw {|
  function(value) {
    return value
  }
|}];

/*
Line 8, 11: This definition has type 'a -> 'a which is less general than 'a0. 'a0 -> 'a0
*/

https://reasonml.github.io/en/try.html?reason=FAGwpgLgBAlgJmAdhGECeBGAXFA5AQygF4A%20PQoqAbQFIAjAZwDoAnfAdygG8AfYKKADMArogDGKAPaIAFADd8IYWACU3fgKgtIwloigKlYDQF9gPEwF0A3MGAB6AFTAAMjERgoAJgA0UDNhQACoAFp7oAA6ekoJQECEwDFBgAB4R2gwMMNJ%20uAD6hAC0ZPn4fmLSEPjuSZGeCiww%20HTgtSH40GL4iIiS0HSeAOZIYGwgMABeYHDAjvZ24NDwSCjoXjgETOTEJRTU9MxsnLwaIuJSsobKalwaAtoQuvpXxgJmFjZ2Tq7ungAcfgCOFCiSgCEE7lQ2X07VqaCi22K23YCTEIVgSVaSWGHjGcXa%20gIAAYtsSoEjibN5kA