One of the ways you can achieve what you want is using 🐊Putout code transformer with a couple built-in plugins and one new:

export const fix = (path) => {
    path.replaceWith(path.node.declaration);
}
export const include = () => [
    'ExportDefaultDeclaration',
    'ExportNamedDeclaration'
];

That will remove all kind of exports, since we don't need it in our AST because of tree shake.

It looks this way:

You can edit it in 🐊Putout Editor.

This is the whole tree shaker:

import putout from 'putout';

putout('your code', {
    plugins: [
        'remove-unused-variables',
        'remove-unused-expressions',
        'remove-unreachable-code',
        'remove-unreferenced-variables',
        ['remove-export', {
            fix: (path) => {
                path.replaceWith(path.node.declaration);
            },
            include: () => [
                'ExportDefaultDeclaration', 
                'ExportNamedDeclaration'
            ]
        }]
    ]
});

You can take a look to all unsafe transformations from eslint-plugin-putout.

🐊Putout is one of tools I'm working on and I'm always glad to help with any issues related to AST and code transformations.