import type { Hex } from "viem";
import type { CallType, TraceFrame } from "../types.js";
export interface FlamegraphBar {
    frame: TraceFrame;
    depth: number;
    /** Left offset as a percentage of total gas (0-100). */
    startGas: number;
    /** Bar width as a percentage of total gas (0-100). */
    width: number;
    /** Display label — typically the function name (or selector fallback). */
    label: string;
    /** Hex color (e.g. "rgb(99, 102, 241)") for this bar. */
    color: string;
}
/**
 * Lighten or darken a `#rrggbb` hex string by `amount` per channel (0-255).
 * Returns an `rgb(...)` string. Caller is responsible for passing a valid
 * 7-char hex; bad inputs produce NaN channels and are clamped to 0/255.
 */
export declare function adjustBrightness(hex: string, amount: number): string;
export declare function getBarColor(type: CallType, depth: number): string;
export interface LayoutOptions {
    /** Resolve a 4-byte selector to a readable label (e.g. "transfer"). */
    resolveSelector?: (selector: Hex) => string | undefined;
}
/**
 * Compute flamegraph bars from a TraceFrame tree. Pure function — no I/O,
 * no React, no DOM. The output is an ordered list of bars with depth, left
 * offset, and width as percentages of the root's `gasUsed`.
 *
 * Uses the SDK's `walkCallTree` (explicit stack) for safe traversal of deep
 * trees.
 */
export declare function buildFlamegraphLayout(root: TraceFrame, options?: LayoutOptions): FlamegraphBar[];
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