svelte

import { defineCatalog } from "@json-render/core";
import { schema } from "@json-render/svelte";
import { z } from "zod";
 
export const catalog = defineCatalog(schema, {
  components: {
    Button: {
      props: z.object({
        label: z.string(),
        variant: z.enum(["primary", "secondary"]).nullable(),
      }),
      description: "Clickable button",
    },
    Card: {
      props: z.object({ title: z.string() }),
      description: "Card container with title",
    },
  },
});

interface BaseComponentProps<TProps> {
  props: TProps; // Resolved props for this component
  children?: Snippet; // Child elements (use {@render children()})
  emit: (event: string) => void; // Fire a named event
  bindings?: Record<string, string>; // Map of prop names to state paths (for $bindState)
  loading?: boolean; // True while spec is streaming
}

<!-- Button.svelte -->
<script lang="ts">
  import type { BaseComponentProps } from "@json-render/svelte";
 
  interface Props extends BaseComponentProps<{ label: string; variant?: string }> {}
  let { props, emit }: Props = $props();
</script>
 
<button class={props.variant} onclick={() => emit("press")}>
  {props.label}
</button>

<!-- Card.svelte -->
<script lang="ts">
  import type { Snippet } from "svelte";
  import type { BaseComponentProps } from "@json-render/svelte";
 
  interface Props extends BaseComponentProps<{ title: string }> {
    children?: Snippet;
  }
 
  let { props, children }: Props = $props();
</script>
 
<div class="card">
  <h2>{props.title}</h2>
  {#if children}
    {@render children()}
  {/if}
</div>

import { defineRegistry } from "@json-render/svelte";
import { catalog } from "./catalog";
import Card from "./components/Card.svelte";
import Button from "./components/Button.svelte";
 
const { registry, handlers, executeAction } = defineRegistry(catalog, {
  components: {
    Card,
    Button,
  },
  actions: {
    submit: async (params, setState, state) => {
      // handle action
    },
  },
});

{
  "root": "card1",
  "elements": {
    "card1": {
      "type": "Card",
      "props": { "title": "Hello" },
      "children": ["btn1"]
    },
    "btn1": {
      "type": "Button",
      "props": { "label": "Click me" }
    }
  }
}

<!-- Button.svelte -->
<script lang="ts">
  import type { BaseComponentProps } from "@json-render/svelte";
 
  interface Props extends BaseComponentProps<{ label: string }> {}
 
  let { props, emit }: Props = $props();
</script>
 
<button onclick={() => emit("press")}>{props.label}</button>

{
  "type": "Button",
  "props": { "label": "Submit" },
  "on": { "press": { "action": "submit" } }
}

{
  "action": "setState",
  "actionParams": { "statePath": "/activeTab", "value": "home" }
}

<script lang="ts">
  import { getBoundProp } from "@json-render/svelte";
  import type { BaseComponentProps } from "@json-render/svelte";
 
  interface Props extends BaseComponentProps<{ value?: string }> {}
  let { props, bindings }: Props = $props();
 
  let value = getBoundProp<string>(
    () => props.value,
    () => bindings?.value,
  );
</script>
 
<input bind:value={value.current} />

<script lang="ts">
  import { createUIStream, Renderer } from "@json-render/svelte";
 
  const stream = createUIStream({
    api: "/api/generate-ui",
    onComplete: (spec) => console.log("Done", spec),
  });
 
  async function generate() {
    await stream.send("Create a login form");
  }
</script>
 
<button onclick={generate} disabled={stream.isStreaming}>
  {stream.isStreaming ? "Generating..." : "Generate UI"}
</button>
 
{#if stream.spec}
  <Renderer spec={stream.spec} {registry} loading={stream.isStreaming} />
{/if}

const chat = createChatUI({ api: "/api/chat-ui" });
await chat.send("Build a settings panel");