const LOCALS_NAME = "locals";

export default function({ types: t }) {
    return {
        visitor: {
            Identifier(path) {
                // The identifier should have the expected name
                if (path.node.name !== LOCALS_NAME) { return; }
                // The identifier should not be part of a declaration
                if (!path.isReferencedIdentifier()) { return; }
                // The identifier should not reference a variable in current scope
                if (path.scope.hasBinding(LOCALS_NAME)) { return; }

                // console.log('locals expanded to', Object.keys(path.scope.getAllBindings()));


                let vars = Object.keys(path.scope.getAllBindings())
                        .map(label => t.objectProperty(
                        t.identifier(label), // key
                        t.identifier(label), // value
                        undefined, // computed?
                        true, // shorthand?
                        undefined // decorators array
                    ));

                path.replaceWith(
                    t.objectExpression(vars)
                );
            }
        }
    };
}