jscodeshift codemod to remove IIFE wrap

remove-iife.js

module.exports = function(fileInfo, { jscodeshift: j }) {
    const ast = j(fileInfo.source);
    const body = ast.find(j.Program).get("body");
    const getFirstNode = () => ast.find(j.Program).get('body', 0).node;

    // Save the comments attached to the first node
    const firstNode = getFirstNode();
    const { comments } = firstNode;

    ast
        .find(j.ExpressionStatement, isIifeExpression)
        .forEach(ast => {
            if (ast.scope.isGlobal) {
                j(ast).replaceWith(ast.node.expression.callee.body.body);
            }

        });

    ast // remove 'use strict'
        .find(j.ExpressionStatement, isUseStrictExpression)
        .forEach(ast => j(ast).remove());

    ast //remove global return expressions (which appears after unwrapping from IIFE)
        .find(j.ReturnStatement)
        .forEach(ast => {
            if (ast.scope.isGlobal) {
                j(ast).remove();
            }
        });

    // If the first node has been modified or deleted, reattach the comments
    const firstNode2 = getFirstNode();
    if (firstNode2 !== firstNode) {
        firstNode2.comments = comments;
    }

    return ast.toSource({
        arrowParensAlways: true,
        quote: "single"
    });
};

function isIifeExpression(node) {
    return node.expression &&
        node.expression.type === "CallExpression" &&
        node.expression.callee.type === "FunctionExpression";
}

function isUseStrictExpression(node) {
    return (
        node.type === "ExpressionStatement" && node.expression && node.expression.value === "use strict"
    );
}

How do you feed this a list of js files. Thanks