import type { DisplayFile } from "./file_thumbnail";
/** Networks whose feed shape and publishing rules this module knows; API-less surfaces (a personal
 *  Facebook profile, a group, a Zalo OA) are pasted by hand. RN-free so an app's publish gate reads it
 *  without rendering. */
export declare const SOCIAL_NETWORKS: readonly ["facebook", "instagram", "threads", "x", "linkedin"];
export type SocialNetwork = (typeof SOCIAL_NETWORKS)[number];
/** The feed's fold (a display fact) and the API's refusals, in one table so preview and gate agree before
 *  publishing. */
export interface SocialNetworkRules {
    /** In code points; X weights URLs and CJK differently, so there it is a guide. */
    maxChars: number;
    /** `null` when the feed never folds. */
    foldChars: number | null;
    /** `null` when the API sets no count. */
    maxImages: number | null;
    video: "alone" | "mixed";
    /** A GIF alone (X) or as an image. */
    gif: "alone" | "image";
    /** A card, or inert text. */
    link: "card" | "text";
    linkBesideMedia: boolean;
    requiresMedia: boolean;
}
export declare const SOCIAL_NETWORK_RULES: Record<SocialNetwork, SocialNetworkRules>;
/** Proper nouns, so not in the packs. */
export declare const SOCIAL_NETWORK_LABELS: Record<SocialNetwork, string>;
export interface SocialPostLink {
    url: string;
    title?: string;
}
/** The three things every network takes. */
export interface SocialPostDraft {
    text: string;
    media?: readonly DisplayFile[];
    link?: SocialPostLink | null;
}
export type SocialPostIssue = {
    kind: "empty";
} | {
    kind: "over_limit";
    over: number;
    max: number;
} | {
    kind: "needs_media";
} | {
    kind: "too_many_images";
    max: number;
} | {
    kind: "video_alone";
} | {
    kind: "gif_alone";
} | {
    kind: "link_or_media";
};
/** Code points, so a toned Vietnamese vowel is one character. */
export declare function countSocialChars(text: string): number;
/** Everything the network would refuse, from the draft alone, so the gate closes before upload in the
 *  preview's words. Empty promises a well-formed request, not a landed post. */
export declare function socialPostIssues(network: SocialNetwork, draft: SocialPostDraft): SocialPostIssue[];
export interface SocialPostPreviewLabels {
    more: string;
    justNow: string;
    /** No words, no files, and no link the feed draws as the post. */
    empty: string;
    overLimit: (over: number) => string;
    needsMedia: string;
    tooManyImages: (max: number) => string;
    videoAlone: string;
    gifAlone: string;
    linkOrMedia: string;
}
/** The same sentence beside the preview and on the gate. */
export declare function socialPostIssueText(issue: SocialPostIssue, labels: SocialPostPreviewLabels): string;