/**
 * Render-tree assembly for the A2UI renderer — the bridge between the pure-TS
 * processor (`a2ui-validate.ts`, plain Maps) and the recursive Svelte dispatcher
 * (`A2UINode.svelte`). Pure TS, no Svelte, so `A2UINode` and `A2UIView` share
 * one typed contract (the house pattern of `md-context.ts`, deliberately not a
 * Svelte context — the tree is private and explicit prop flow keeps it
 * inspectable).
 *
 * `buildRenderTree` walks the component graph from `root` into a fully-expanded,
 * BOUNDED node tree: child/children references resolved, list templates expanded
 * over the data model, dangling references marked, and the depth/node/cycle
 * limits enforced in ONE place so the Svelte layer can never recurse without
 * bound regardless of payload. Graph-level ISSUES (the reportable faults) are
 * still produced by `collectGraphIssues` in `a2ui-validate.ts`; this walk only
 * shapes what renders.
 */
import type { Component, Snippet } from 'svelte';
import type { IconComponent } from '../../../icons/index.js';
import type { MarkdownUrlPolicy } from '../markdown/types.js';
import type { A2uiActionEvent, A2uiValidationIssue } from './a2ui.types.js';
import type { A2uiComponentInstance, A2uiSurfaceState } from './a2ui-validate.js';
/** Default traversal bounds — mirror `collectGraphIssues` so the tree and the issue list agree. */
export declare const A2UI_MAX_DEPTH = 32;
export declare const A2UI_MAX_NODES = 512;
/**
 * One node of the assembled render tree. `instance === null` marks a dangling
 * reference (a child id that was never defined) — rendered as a streaming
 * placeholder or, once settled, a fault chip. `children` are pre-expanded and
 * ordered; `key` is stable across incremental rebuilds so keyed `{#each}` keeps
 * component identity (and input focus) through a keystroke-triggered rebuild.
 */
export interface A2uiRenderNode {
    key: string;
    id: string;
    instance: A2uiComponentInstance | null;
    /** Template-item scope for relative-path resolution and two-way write-back. */
    scopePrefix: string | undefined;
    children: A2uiRenderNode[];
    /** flex-grow, present only when this node is a direct Row/Column child with a finite `weight`. */
    weight?: number;
    /**
     * The parent prop this child came from (e.g. Card `header`/`footer`/`child`).
     * Lets a dispatcher with several named childId slots pick the right child by
     * name instead of position; single-slot / list components ignore it.
     */
    slot?: string;
}
/** Static text labels threaded to the node dispatcher (i18n comes from A2UIView props). */
export interface A2uiRenderLabels {
    unsupported: string;
    blockedImage: string;
    pending: string;
}
/**
 * The single context object each `A2UINode` receives. Carries resolved slot
 * classes, the icon map, the data-binding resolver, the two-way write-back
 * callbacks, the action sink and rendering flags. Rebuilt per version bump so a
 * live data-model edit propagates fresh resolved values without remounting.
 */
export interface A2uiRenderContext {
    /** Resolved class string per slot (tv() + slotClasses + unstyled already applied). */
    classes: Readonly<Record<string, string>>;
    urlPolicy: MarkdownUrlPolicy | undefined;
    /** Dangling refs render placeholders while true; fault chips once false. */
    streaming: boolean;
    /** True inside a Button label (Text renders as an inline plain span). */
    inline: boolean;
    surfaceId: string;
    onAction: ((event: A2uiActionEvent) => void) | undefined;
    /**
     * The data model to attach to a dispatched action, or `undefined` when the
     * surface did not ask for it (`createSurface.sendDataModel`). Read as a
     * function so the action carries the state at CLICK time, not at render time.
     */
    actionDataModel: (() => unknown) | undefined;
    /** Resolve a Dynamic value (literal | { path } | function-call) against the model in `scope`. */
    resolve: (value: unknown, scopePrefix: string | undefined) => {
        value: unknown;
        issue?: A2uiValidationIssue;
    };
    /** Write a value at an absolute JSON Pointer into the surface model, then bump. */
    write: (pointer: string, value: unknown) => void;
    /** Delete the key at an absolute JSON Pointer from the surface model, then bump. */
    remove: (pointer: string) => void;
    /** A2UI icon-name → resolved icon component (IconProvider override honoured, direct import fallback). */
    icons: Readonly<Record<string, IconComponent>>;
    /** Fallback glyph for an unmapped icon name. */
    fallbackIcon: IconComponent;
    labels: A2uiRenderLabels;
    /**
     * The catalog's recursive node dispatcher (Basic → `A2UINode`; a custom
     * catalog → its own dispatcher). A2UIView's `renderNode` snippet renders
     * THIS rather than importing one dispatcher directly, so each surface renders
     * through the component that matches its catalog.
     */
    nodeComponent: Component<A2uiNodeProps>;
}
/**
 * Props of a catalog node dispatcher. Every dispatcher (Basic/Urbicon/…) takes
 * the same triple: the node, its render context, and the self-referencing
 * `renderChild` snippet A2UIView threads down for bounded recursion.
 */
export interface A2uiNodeProps {
    node: A2uiRenderNode;
    context: A2uiRenderContext;
    renderChild: Snippet<[A2uiRenderNode, A2uiRenderContext]>;
}
/**
 * Resolve a `{ path }` data binding to the ABSOLUTE JSON Pointer it addresses,
 * honouring the template scope for relative paths. Returns `undefined` for
 * literals and function-call bindings (nothing to write back into).
 */
export declare function bindingPointer(value: unknown, scopePrefix: string | undefined): string | undefined;
/** Coerce an unknown model value to a string array of stable option values (for ChoicePicker). */
export declare function toStringArray(value: unknown): string[];
/** Coerce a scalar model value to the string an `<input>` displays. */
export declare function toInputString(value: unknown): string;
/**
 * Assemble the bounded render tree for a surface, starting at `root`. Returns
 * `null` when no `root` component exists yet (the caller renders a placeholder
 * while streaming, or a fault chip once settled).
 */
export declare function buildRenderTree(surface: A2uiSurfaceState, options?: {
    maxDepth?: number;
    maxNodes?: number;
}): A2uiRenderNode | null;