Context bug in SSR

[yuanyan]

Help us to manage our issues by answering the following:

1. How would you tag this issue?

• Bug

2. Describe your issue:

const ThemeContext = createContext('light');

function MyContext() {
  return (
    <ThemeContext.Provider value={'dark'}>
      <MyComponent />
    </ThemeContext.Provider>
  );
};

function MyComponent() {
  return (
    <ThemeContext.Consumer>
      {value => <div>{value}</div>}
    </ThemeContext.Consumer>
  );
};

function MyContext2() {
  const value = useContext(ThemeContext);
  return <div>{value}</div>
}

function MyComponent2() {
  return (
    [
      <MyContext />,
      <MyContext2 />
    ]
  );
};

const str = renderToString(<MyComponent2 />);
// current output: <div>dark</div><div>dark</div>
// expect to: <div>dark</div><div>light</div>
.

[yuchonghua]

#889

[yuanyan]

fixed in #1378

[yuchonghua]

其实不是很理解， expect to:

dark

light

为什么SSR的时候class组件不应该读取Context