assert isFalse called to assertIsTrue notCalled

// Press ctrl+space for code completion
export default function transformer(file, api) {
  const j = api.jscodeshift;

  return j(file.source)
    .find(j.CallExpression)
    .filter(x => x.node.callee.object && x.node.callee.object.name === "assert")
    .filter(x => x.node.callee.property && x.node.callee.property.name === "isFalse")
    .filter(x => x.node.arguments.length > 0 && x.node.arguments[0].property && x.node.arguments[0].property.name === "called")
    .forEach(path => {
      j(path).replaceWith(
        j.callExpression(j.memberExpression(j.identifier("assert"), j.identifier("isTrue")), [
          j.memberExpression(path.node.arguments[0].object, j.identifier("notCalled"))
        ])
      );
    })
    .toSource();
}