react-query/examples/solid/solid-start-streaming/src/components/query-boundary.tsx

import { ErrorBoundary, Match, Suspense, Switch, children } from 'solid-js'
import type { UseQueryResult } from '@tanstack/solid-query'
import type { JSX } from 'solid-js'

export interface QueryBoundaryProps<T = unknown> {
  query: UseQueryResult<T, Error>

  /**
   * Triggered when the data is initially loading.
   */
  loadingFallback?: JSX.Element

  /**
   * Triggered when fetching is complete, but the returned data was falsey.
   */
  notFoundFallback?: JSX.Element

  /**
   * Triggered when the query results in an error.
   */
  errorFallback?: (err: Error, retry: () => void) => JSX.Element

  /**
   * Triggered when fetching is complete, and the returned data is not falsey.
   */
  children: (data: Exclude<T, null | false | undefined>) => JSX.Element
}

/**
 * Convenience wrapper that handles suspense and errors for queries. Makes the results of query.data available to
 * children (as a render prop) in a type-safe way.
 */
export function QueryBoundary<T>(props: QueryBoundaryProps<T>) {
  return (
    <Suspense fallback={props.loadingFallback}>
      <ErrorBoundary
        fallback={(err: Error, reset) =>
          props.errorFallback ? (
            props.errorFallback(err, async () => {
              await props.query.refetch()
              reset()
            })
          ) : (
            <div>
              <div class="error">{err.message}</div>
              <button
                onClick={async () => {
                  await props.query.refetch()
                  reset()
                }}
              >
                retry
              </button>
            </div>
          )
        }
      >
        <Switch>
          {/* <Match when={props.query.isError}>
            {props.errorFallback ? (
              props.errorFallback
            ) : (
              <div>
                <div class="error">{props.query.error?.message}</div>
                <button
                  onClick={() => {
                    props.query.refetch();
                  }}
                >
                  retry
                </button>
              </div>
            )}
          </Match> */}

          <Match when={!props.query.isFetching && !props.query.data}>
            {props.notFoundFallback ? (
              props.notFoundFallback
            ) : (
              <div>not found</div>
            )}
          </Match>

          <Match when={props.query.data}>
            {props.children(
              props.query.data as Exclude<T, null | false | undefined>,
            )}
          </Match>
        </Switch>
      </ErrorBoundary>
    </Suspense>
  )
}