React.default.memo is not a function (React-Native

问题:

I get this the error

_react.default.memo is not a function

and wrapWithConnect.
This is a react-native project and it worked fine before I used the connect function to connect my dispatch into my react component:

Package Versions:

    "react": "16.5.0",
    "react-redux": "^6.0.1",
    "redux": "^4.0.1",
    "redux-logger": "^3.0.6",
    "redux-thunk": "^2.3.0",

code

const mapDispatchToProps = dispatch => {
 return { 
  sendEmail: (email, navigateMap) => dispatch(sendEmail, navigateMap))

export default connect(null, mapDispatchToProps)(Login)

回答1:

I had the same problem and I changed the version of react-redux to 6.0.1 instead of using a more recent one, and the issue was resolved.

Please change version by running following command:

npm install react-redux@6.0.1.

My project version is greater than 16.5.0 but I am unsure if this also has an impact or not.

回答2:

Had this exact same error. Realised it's not due to syntax errors, but the react-redux version compabitility. Once I ran yarn check, it gave me multiple messages that "react-redux#react@^16.8.4 does not satisfy found match of react@16.5.0".

Expo is react 16.5.0 while react-redux expects react version 16.8.4 . As moi answered, installing react-redux 6.0.0 worked for me. Trying to change any other package caused even more errors to appear

回答3:

Try using react 16.6.0 instead of 16.5.0

回答4:

This is issue with expo.Try to clear expo cache by using this command

expo r -c

回答5:

Try update your dependencies.

I have the same problem and I'm using npm-check-updates.

Here's a update check log:

 expo               ^32.0.0  →  ^32.0.6
 react               16.5.0  →   16.8.6
 react-navigation    ^3.6.1  →   ^3.7.1
 babel-preset-expo   ^5.0.0  →   ^5.1.1

Run npm install to install new versions.

回答6:

If you are feeling lost and shelterless while trying to implement a modern React-Native inside Expo app, do not worry my friend, you are not alone.

I had this problem and found that:

• expo 32.0 does not support react 16.8

• react-redux 7.1 and on require react 16.8

I was able to make it work with this set of versions:

"expo": "^32.0.0",
"react": "16.5.0",
"react-redux": "^6.0.1",

You can replace them in your package.json, then you should do:

> rm -rf node_modules
> [npm|yarn] install
> expo r -c 

In order to remove previous versions from node_modules and Expo cache.

回答7:

To combine the two answers that solved it for me:

1. Remove new react-redux: yarn remove react-redux
2. Install the older version of react-redux: yarn add react-redux@6.0.1
3. Clear expo cache: expo r -c

That will do the trick.