AsyncView

npx @glasskit-ui/cli add async-view

npm install @glasskit-ui/react

// components/lib/utils.tsexport type ClassValue = string | number | null | undefined | false;/** * Join truthy class names. Dependency-free on purpose: the lens components * style via bespoke semantic classes (no conflicting Tailwind utilities to * de-dupe), so this needs no clsx/tailwind-merge and resolves from anywhere * the registry is vendored. */export function cn(...inputs: ClassValue[]): string {  return inputs.filter(Boolean).join(" ");}/** * Accessible name from a free-form `label` prop: the label itself when it's a * plain string, otherwise undefined (a ReactNode can't become an aria-label). */export function stringLabel(label: unknown): string | undefined {  return typeof label === "string" ? label : undefined;}

// components/glasskit/async-view.tsximport type { ReactNode } from "react";import { cn } from "../lib/utils";export type AsyncStatus = "idle" | "loading" | "success" | "error";/** * <AsyncView> — the four-state async renderer every data screen needs: * placeholder (idle) → loading → success/error. The consumer owns the * async work and passes the current `status`; AsyncView picks the view. * This is the spine's one styled-with-logic piece — the logic is the * state→view selection, nothing more. * * Sensible additive defaults: an emitted pulse for loading, a dim line * for error. Override any state via its slot. */export function AsyncView({  status,  children,  loading,  error,  placeholder,  errorLabel = "Couldn’t load",  className,}: {  status: AsyncStatus;  /** Success content. */  children?: ReactNode;  loading?: ReactNode;  error?: ReactNode;  placeholder?: ReactNode;  /** Default error message when no `error` slot is given. */  errorLabel?: ReactNode;  className?: string;}) {  if (status === "success") return <>{children}</>;  let body: ReactNode;  if (status === "loading") {    body = loading ?? <Spinner />;  } else if (status === "error") {    body = error ?? <p className="t-body gk-async-error">{errorLabel}</p>;  } else {    body = placeholder ?? null;  }  return (    <div      className={cn("gk-async", className)}      role="status"      aria-busy={status === "loading"}    >      {body}    </div>  );}/** The default loading indicator — three emitted dots pulsing in sequence. */export function Spinner({ label = "Loading" }: { label?: string }) {  return (    <span className="gk-spinner" role="img" aria-label={label}>      <span />      <span />      <span />    </span>  );}