Error: jest-haste-map: Haste module naming collision:

Question

I have created a custom npm module (will use xxx instead of its name) and link it manually using npm install.

I tried very har

Answer 1

Add rn-cli.config.js In the root project

const blacklist = require('metro-config/src/defaults/blacklist');
module.exports = {
 resolver: {
    blacklistRE: blacklist([
        /node_modules\/.*\/node_modules\/react-native\/.*/,
    ])
 },
};

see this issue

Hope it works for you

Answer 2

It looks like you have a 2 different react-native project folders where one is dependent over another (it's getting included as node_module dependency) and it seems you are running your server start ("react-native start") command from the library folder.

Answer 3

The error you get indicates that you have two react-native dependencies. One in your main project, one in your xxx module, thus creating a conflict between their package.jsons. seems like if you install a package from a local path, it copies its node_modules directory.

As you already have react-native as peer dependency in your custom module's package.json, try removing E:\cdg-native\CDG\node_modules\react-native-XXX\node_modules, this should solve the conflict.