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Version: v15.0.0



import type {UserComponent_user$key} from 'UserComponent_user.graphql';

const React = require('React');

const {graphql, useFragment} = require('react-relay');

type Props = {
user: UserComponent_user$key,

function UserComponent(props: Props) {
const data = useFragment(
fragment UserComponent_user on User {
profile_picture(scale: 2) {

return (
<img src={data.profile_picture?.uri} />


  • fragment: GraphQL fragment specified using a graphql template literal.
  • fragmentReference: The fragment reference is an opaque Relay object that Relay uses to read the data for the fragment from the store; more specifically, it contains information about which particular object instance the data should be read from.
    • The type of the fragment reference can be imported from the generated Flow types, from the file <fragment_name>.graphql.js, and can be used to declare the type of your Props. The name of the fragment reference type will be: <fragment_name>$key. We use our lint rule to enforce that the type of the fragment reference prop is correctly declared.

Return Value

  • data: Object that contains data which has been read out from the Relay store; the object matches the shape of specified fragment.
    • The Flow type for data will also match this shape, and contain types derived from the GraphQL Schema. For example, the type of data above is: { name: ?string, profile_picture: ?{ uri: ?string } }.


  • The component is automatically subscribed to updates to the fragment data: if the data for this particular User is updated anywhere in the app (e.g. via fetching new data, or mutating existing data), the component will automatically re-render with the latest updated data.
  • The component will suspend if any data for that specific fragment is missing, and the data is currently being fetched by a parent query.

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