import type { ViewStyle } from 'react-native';
/**
 * Derive up to {@link MAX_INITIALS} initials from a name. Names starting with `+`
 * (e.g. phone numbers) keep the leading `+`.
 */
export declare const abbr: (name: string, noUpperCase?: boolean) => string;
/** Deterministic char-code sum used to pick a stable color for a given name. */
export declare const sumChars: (str: string) => number;
/**
 * Resolve whether `src` points at a usable image.
 *
 * Uses the global `fetch`/`AbortController` available in modern React Native, so
 * no polyfill is required. Intentional aborts (unmount / `src` change) resolve to
 * `false` without logging. Hosts that omit `content-type` are trusted unless the
 * caller opts into a strict check.
 */
export declare const fetchImage: (src: string, options?: RequestInit, ignoreContentType?: boolean) => Promise<boolean>;
/** Deterministically pick a background color for a name (or use `bgColor` if given). */
export declare const generateBackgroundColor: (name: string, bgColor?: string, bgColors?: string[]) => string;
/** Style variant of {@link generateBackgroundColor}. */
export declare const generateBackgroundStyle: (name: string, bgColor?: string, bgColors?: string[]) => ViewStyle;
/** Container style shared by every avatar variant. */
export declare const getContainerStyle: (size: number, src?: string, borderRadius?: number) => ViewStyle;
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