nextui/apps/docs/content/components/dropdown/multiple-selection.ts

const App = `import {Dropdown, DropdownTrigger, DropdownMenu, DropdownItem, Button} from "@nextui-org/react";

export default function App() {
  const [selectedKeys, setSelectedKeys] = React.useState(new Set(["text"]));

  const selectedValue = React.useMemo(
    () => Array.from(selectedKeys).join(", ").replaceAll("_", " "),
    [selectedKeys]
  );

  return (
    <Dropdown>
      <DropdownTrigger>
        <Button 
          variant="bordered" 
          className="capitalize"
        >
          {selectedValue}
        </Button>
      </DropdownTrigger>
      <DropdownMenu 
        aria-label="Single selection actions"
        variant="flat"
        closeOnSelect={false}
        disallowEmptySelection
        selectionMode="multiple"
        selectedKeys={selectedKeys}
        onSelectionChange={setSelectedKeys}
      >
        <DropdownItem key="text">Text</DropdownItem>
        <DropdownItem key="number">Number</DropdownItem>
        <DropdownItem key="date">Date</DropdownItem>
        <DropdownItem key="single_date">Single Date</DropdownItem>
        <DropdownItem key="iteration">Iteration</DropdownItem>
      </DropdownMenu>
    </Dropdown>
  );
}`;

const react = {
  "/App.jsx": App,
};

export default {
  ...react,
};