Get all posts for all post types in javascript.

gistfile1.txt

wp.apiFetch( { path: '/wp/v2/types' } ).then( ( post_types ) => {
	for ( let post_type in post_types ){
		let {rest_base} = post_types[post_type];
        wp.apiFetch( { path: '/wp/v2/' + rest_base } ).then( ( posts ) => {
			console.log(posts);
		});
    }
} );