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Radix UI Primitives are written in TypeScript and provide comprehensive type definitions. All components export their prop types, making it easy to extend and compose them in a type-safe manner.

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Type Exports

Each component package exports TypeScript types for all its parts: 
import * as Dialog from '@radix-ui/react-dialog';
import type { 
  DialogProps,
  DialogTriggerProps,
  DialogContentProps,
  DialogTitleProps,
  DialogDescriptionProps,
  DialogCloseProps,
} from '@radix-ui/react-dialog';

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Component Type Inference

Radix components use React.forwardRef with proper typing. You can infer element types using React’s utility types: 
import * as Switch from '@radix-ui/react-switch';
import { ComponentPropsWithoutRef, ElementRef } from 'react';

// Get the element type
type SwitchElement = ElementRef<typeof Switch.Root>;
// Result: HTMLButtonElement

// Get the props type
type SwitchProps = ComponentPropsWithoutRef<typeof Switch.Root>;
// Result: SwitchProps including all button props

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Extending Component Props

You can extend Radix component props to create your own typed components: 
import * as Dialog from '@radix-ui/react-dialog';
import { ComponentPropsWithoutRef, ElementRef, forwardRef } from 'react';

interface MyDialogProps extends ComponentPropsWithoutRef<typeof Dialog.Content> {
  title: string;
  description?: string;
  children: React.ReactNode;
}

const MyDialog = forwardRef<
  ElementRef<typeof Dialog.Content>,
  MyDialogProps
>(({ title, description, children, ...props }, ref) => (
  <Dialog.Portal>
    <Dialog.Overlay className="overlay" />
    <Dialog.Content ref={ref} {...props}>
      <Dialog.Title>{title}</Dialog.Title>
      {description && <Dialog.Description>{description}</Dialog.Description>}
      {children}
      <Dialog.Close>Close</Dialog.Close>
    </Dialog.Content>
  </Dialog.Portal>
));

MyDialog.displayName = 'MyDialog';

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Generic Props

Some components like Accordion have discriminated union types for their props: 
import * as Accordion from '@radix-ui/react-accordion';

// Single mode - value is a string
function SingleAccordion() {
  return (
    <Accordion.Root 
      type="single" 
      collapsible
      defaultValue="item-1" // string
      onValueChange={(value) => {
        // value is string
        console.log(value);
      }}
    >
      {/* items */}
    </Accordion.Root>
  );
}

// Multiple mode - value is string[]
function MultipleAccordion() {
  return (
    <Accordion.Root 
      type="multiple"
      defaultValue={["item-1", "item-2"]} // string[]
      onValueChange={(value) => {
        // value is string[]
        console.log(value);
      }}
    >
      {/* items */}
    </Accordion.Root>
  );
}
The type prop determines the types of value, defaultValue, and the onValueChange callback parameter.

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Controlled vs Uncontrolled Types

Radix components support both controlled and uncontrolled usage with appropriate types: 
import * as Collapsible from '@radix-ui/react-collapsible';
import { useState } from 'react';

// Uncontrolled
function UncontrolledCollapsible() {
  return (
    <Collapsible.Root defaultOpen={false}>
      {/* content */}
    </Collapsible.Root>
  );
}

// Controlled
function ControlledCollapsible() {
  const [open, setOpen] = useState(false);
  
  return (
    <Collapsible.Root 
      open={open} 
      onOpenChange={setOpen}
    >
      {/* content */}
    </Collapsible.Root>
  );
}

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Ref Types

All Radix components properly forward refs with correct types: 
import * as Dialog from '@radix-ui/react-dialog';
import { useRef } from 'react';

function MyComponent() {
  // Type is inferred as React.RefObject<HTMLDivElement>
  const contentRef = useRef<React.ElementRef<typeof Dialog.Content>>(null);
  
  return (
    <Dialog.Root>
      <Dialog.Trigger>Open</Dialog.Trigger>
      <Dialog.Portal>
        <Dialog.Content ref={contentRef}>
          Content
        </Dialog.Content>
      </Dialog.Portal>
    </Dialog.Root>
  );
}

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Primitive Component Types

Radix uses a Primitive component system. Each primitive extends native HTML element props: 
import { Primitive } from '@radix-ui/react-primitive';
import { ComponentPropsWithoutRef } from 'react';

// These are equivalent:
type ButtonProps = ComponentPropsWithoutRef<typeof Primitive.button>;
type ButtonProps2 = React.ButtonHTMLAttributes<HTMLButtonElement>;

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Type-Safe Event Handlers

Event handlers maintain proper types: 
import * as Switch from '@radix-ui/react-switch';

function MySwitch() {
  return (
    <Switch.Root
      onCheckedChange={(checked) => {
        // checked is boolean
        console.log(checked);
      }}
      onClick={(event) => {
        // event is React.MouseEvent<HTMLButtonElement>
        console.log(event.currentTarget);
      }}
    >
      <Switch.Thumb />
    </Switch.Root>
  );
}

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Creating Wrapper Libraries

Build type-safe wrapper components:
1

Define base component types

import * as DialogPrimitive from '@radix-ui/react-dialog';
import { ComponentPropsWithoutRef, ElementRef, forwardRef } from 'react';

type DialogContentElement = ElementRef<typeof DialogPrimitive.Content>;
type DialogContentProps = ComponentPropsWithoutRef<typeof DialogPrimitive.Content>;
2

Extend with custom props

interface MyDialogContentProps extends DialogContentProps {
  /** Custom prop for styling */
  variant?: 'default' | 'large';
  /** Custom prop for behavior */
  closeOnOverlayClick?: boolean;
}
3

Create typed component

const DialogContent = forwardRef<DialogContentElement, MyDialogContentProps>(
  ({ variant = 'default', closeOnOverlayClick = true, ...props }, ref) => {
    return (
      <DialogPrimitive.Portal>
        <DialogPrimitive.Overlay />
        <DialogPrimitive.Content
          ref={ref}
          onInteractOutside={(e) => {
            if (!closeOnOverlayClick) e.preventDefault();
          }}
          className={`dialog-content dialog-content--${variant}`}
          {...props}
        />
      </DialogPrimitive.Portal>
    );
  }
);
DialogContent.displayName = 'DialogContent';

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AsChild Prop Type

The asChild prop allows component composition with proper typing: 
import * as Dialog from '@radix-ui/react-dialog';
import { motion } from 'framer-motion';

function AnimatedDialog() {
  return (
    <Dialog.Root>
      <Dialog.Trigger asChild>
        <button className="custom-button">
          Open
        </button>
      </Dialog.Trigger>
      <Dialog.Portal>
        <Dialog.Content asChild>
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
          >
            Content
          </motion.div>
        </Dialog.Content>
      </Dialog.Portal>
    </Dialog.Root>
  );
}
When using asChild, the Radix component merges its props with the child component’s props.

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Common Type Patterns

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Discriminated Unions

import type { AccordionSingleProps, AccordionMultipleProps } from '@radix-ui/react-accordion';

// Type is automatically discriminated by the 'type' property
type AccordionProps = AccordionSingleProps | AccordionMultipleProps;

function handleAccordion(props: AccordionProps) {
  if (props.type === 'single') {
    // props.value is string | undefined
    // props.onValueChange is (value: string) => void
  } else {
    // props.value is string[] | undefined
    // props.onValueChange is (value: string[]) => void
  }
}

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Polymorphic Components

import { forwardRef } from 'react';
import { Primitive } from '@radix-ui/react-primitive';

type ButtonProps<T extends React.ElementType = 'button'> = {
  as?: T;
} & React.ComponentPropsWithoutRef<T>;

const Button = forwardRef(
  <T extends React.ElementType = 'button'>(
    { as, ...props }: ButtonProps<T>,
    ref: React.Ref<Element>
  ) => {
    const Component = as || 'button';
    return <Component ref={ref} {...props} />;
  }
);

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Troubleshooting

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Type Errors with Refs

If you get type errors with refs, ensure you’re using the correct type: 
import * as Dialog from '@radix-ui/react-dialog';
import { ElementRef, useRef } from 'react';

// ✅ Correct
const ref = useRef<ElementRef<typeof Dialog.Content>>(null);

// ❌ Incorrect
const ref = useRef<HTMLDivElement>(null);

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Type Inference Issues

If TypeScript can’t infer types properly, explicitly annotate them: 
import * as Accordion from '@radix-ui/react-accordion';

const MyAccordion = () => {
  return (
    <Accordion.Root<'single'> type="single" collapsible>
      {/* content */}
    </Accordion.Root>
  );
};

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Strict Mode

Radix Primitives work with TypeScript’s strict mode enabled: 
{
  "compilerOptions": {
    "strict": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true
  }
}

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Type Utilities

Useful type utilities when working with Radix: 
import { ComponentPropsWithoutRef, ElementRef, ComponentProps } from 'react';
import * as Dialog from '@radix-ui/react-dialog';

// Extract element type
type DialogElement = ElementRef<typeof Dialog.Content>;

// Extract props without ref
type DialogProps = ComponentPropsWithoutRef<typeof Dialog.Content>;

// Extract props with ref
type DialogPropsWithRef = ComponentProps<typeof Dialog.Content>;

// Extract specific prop types
type OnOpenChange = NonNullable<DialogProps['onOpenChange']>;
// Result: (open: boolean) => void