A look at the genTypeExpression function of grandma-visitor-jsx

gen-type-expression.js

module.exports = function ({ types: t }) {
  const genTypeExpression = (node) => {
    return t.callExpression(
      t.memberExpression(t.identifier("React"), t.identifier("createElement")),
      [
        /^[A-Z]/.test(node.type[0])
          ? t.identifier(node.type)
          : t.stringLiteral(node.type),
        t.objectExpression(node.args),
        ...node.children.map(genTypeExpression),
      ]
    );
  };

  const GrandmaVisitor = { /* ... */ };
  const GrandmaVisitorInitiator = { /* ... */ };
  
  return { visitor: GrandmaVisitorInitiator };
};