function parseConfigModuleExports(node) {
  // node.left must be assigning to module.exports
  if (
    node &&
    node.type === 'AssignmentExpression' &&
    node.left.type === 'MemberExpression' &&
    node.left.object &&
    node.left.object.type === 'Identifier' &&
    node.left.object.name === 'module' &&
    node.left.property &&
    node.left.property.type === 'Identifier' &&
    node.left.property.name === 'exports'
  ) {
    const plugins = findPluginsInObjectExpression(node.right);
    return { plugins };
  }
  return null;
}
@param {Object} node Root node of the gatsby.config.js file