/**
 * avatar.ts — roster avatar rendering (T18-avatar).
 *
 * Produces the leading avatar element for a message row: an <img> when the
 * sender has an avatar URL, or a deterministic initials-circle fallback.
 * Falls back to initials on image load error (onerror).
 *
 * Security: the avatar URL is caller-supplied roster data. It is assigned via
 * `img.src` (the property), NEVER via innerHTML, and only when it is an http(s)
 * URL — a defensive second gate on top of the server-side scheme validation.
 */
/** Deterministic initials from a display name (1-2 uppercase letters). */
export declare function avatarInitials(name: string): string;
/** Deterministic background color (HSL string) seeded by a stable id (epid). */
export declare function avatarColor(seed: string): string;
export interface AvatarOptions {
    /** Display name — used for alt text and the initials fallback. */
    name: string;
    /** Avatar URL, or null for the initials fallback. */
    avatarUrl: string | null;
    /** Stable id (epid) seeding the fallback color. */
    seed: string;
}
/**
 * Build the leading avatar element for a message row.
 *
 * - avatarUrl present + http(s): an <img> (src set via property, never
 *   innerHTML); on load error it swaps to the initials fallback.
 * - avatarUrl null/invalid: a deterministic initials circle.
 *
 * Accessible: the <img> carries alt = display name; the initials circle is
 * decorative (aria-hidden) since the sender name is already in the bubble.
 */
export declare function createAvatarElement(opts: AvatarOptions): HTMLElement;
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