/**
 * The transcript block model and its renderer.
 *
 * A {@link Block} is one logical unit of the conversation — a user message, a
 * streamed assistant reply, a reasoning trace, a tool call, a nested subagent
 * step, a log line, and so on. {@link renderBlockLines} turns a block into the
 * exact terminal rows it occupies: a colored gutter glyph, brand-aligned
 * indentation, nesting rules for subagents, and word-wrapped content — with no
 * boxes anywhere. Every returned row is already styled and fits within the
 * given width, so the live region can place rows verbatim.
 */
import type { Theme } from "./theme.js";
export type ToolStatus = "running" | "done" | "error" | "denied" | "approval";
export type BlockKind = "user" | "assistant" | "reasoning" | "tool" | "error" | "notice" | "question" | "subagent" | "subagent-step" | "subagent-tool" | "connection-auth" | "log";
/**
 * One renderable transcript unit. Fields are interpreted per `kind`; unset
 * fields are simply omitted from the rendered output.
 */
export interface Block {
    kind: BlockKind;
    /** Stable id for in-place updates while the block is live. */
    id?: string;
    /** Nesting depth: 0 = top level, 1 = inside a subagent, etc. */
    depth?: number;
    /** Whether the block is still streaming / mutating (drives the spinner). */
    live?: boolean;
    /** Primary label — tool name, subagent name, log source, error title. */
    title?: string;
    /** Compact secondary text — summarized tool args. */
    subtitle?: string;
    /** Main multi-line content (markdown for prose, plain for logs). */
    body?: string;
    /** Reasoning trace shown above `body` (subagent steps). */
    reasoning?: string;
    /** One-line summarized result shown after a tool resolves. */
    result?: string;
    /**
     * Errors only: multi-line diagnostic dump (stack trace, cause chain)
     * rendered dim beneath the headline, capped to a handful of lines.
     */
    detail?: string;
    /** Tool / connection lifecycle status. */
    status?: ToolStatus;
    /** When true, treat `body` as pre-styled and only wrap + indent it. */
    preformatted?: boolean;
    /** Reasoning only: collapse the trace to a single "thinking" line. */
    collapsed?: boolean;
    /** When true, expand tool input/output instead of summarizing. */
    expanded?: boolean;
    /** Raw tool input / output for the expanded view. */
    toolInput?: unknown;
    toolOutput?: unknown;
}
export interface RenderBlockContext {
    /** Current spinner frame for live blocks. */
    spinner: string;
    /**
     * Kind and title of the block rendered immediately above this one. Lets a
     * log block detect that it continues a same-source run (label suppressed,
     * lines hang under the previous block's label) without any mutable run
     * state — each captured write stays its own immediately-committed block.
     */
    previous?: {
        kind: BlockKind;
        title?: string;
    };
}
/**
 * Renders a block to its terminal rows. Each row is fully styled and clipped
 * to `width` visible columns.
 */
export declare function renderBlockLines(block: Block, width: number, theme: Theme, context: RenderBlockContext): string[];
