/**
 * A small, fixed-size rolling log of "what the user did just before a crash".
 *
 * The tracker pushes a breadcrumb whenever it detects a click, navigation,
 * console error, or network error. When an error is captured we attach a
 * snapshot of the buffer so each report carries its lead-up context.
 *
 * Pure and dependency-free; covered by __tests__/breadcrumbs.test.ts.
 */
export type BreadcrumbType = 'click' | 'navigation' | 'console' | 'network';
export interface Breadcrumb {
    type: BreadcrumbType;
    message: string;
    timestampMs: number;
    data?: Record<string, unknown>;
}
export declare class BreadcrumbBuffer {
    private readonly max;
    private items;
    constructor(max?: number);
    /** Append a breadcrumb, evicting the oldest once the buffer is full. */
    add(crumb: Breadcrumb): void;
    /** Return a shallow copy so callers can't mutate the live buffer. */
    snapshot(): Breadcrumb[];
    clear(): void;
    get size(): number;
}
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