If you need to declare a global variable in React, then you can do the following:

Create a file called config.js

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module.exports = global.config = {
    something: {
        somethingelse: {
            amount: 123,
            name: "Andrew"
        }
    }
};

Then import the config file where you need it:

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import './config';

Then where you need it in your code:

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global.config.something.somethingelse.amount

or

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global.config.something.somethingelse.name