TL;DR

The only difference between @mdx-js/loader and @blocz/mdx-loader is that @blocz/mdx-loader outputs, in addition to the MDX component, an object importStatements with the list of every imports defined in the MDX file.

How to use

yarn add -D @blocz/mdx-loader

And then, adds in your webpack config:

module.exports = {
    // ...
    module: {
        rules: [
            // ...
            {
                test: /.mdx?$/,
                loader: "@blocz/mdx-loader",
            },
        ],
    },
};

And finally:

import MyAwesomeComponent, { importStatements } from './my-awesome-component.mdx';

type importStatements

interface ImportStatement {
    module: string;
    imports: Array<{
        imported: string;
        local: string;
        value: any;
    }>;
}

// example with
// import React, { Component } from 'react';
// import { MDX as MDXLive } from '@blocz/mdx-live';

const importStatements: ImportStatement[] = [
    {
        module: "react",
        imports: [
            {
                imported: "default",
                local: "React",
                value: this_is_the_value_of_the_variable_React,
            },
            {
                imported: "Component",
                local: "Component",
                value: this_is_the_value_of_the_variable_Component,
            },
        ],
    },
    {
        module: "@blocz/mdx-live",
        imports: [
            {
                imported: "MDX",
                local: "MDXLive",
                value: this_is_the_value_of_the_variable_MDXLive,
            },
        ],
    },
];