import { StreamInline, StreamMark } from './types';
/** One styled stretch of text: the marks and link its words share. */
export interface StreamRun {
    marks: StreamMark[];
    href?: string;
}
export type StreamAtom = Exclude<StreamInline, {
    type: 'text';
}>;
/** One thing a stream releases: a word, or an atom (a citation, a custom inline). */
export interface StreamUnit {
    kind: 'word' | 'atom';
    /** The word, or for an atom a key that is equal whenever the atom is. */
    text: string;
    /** Whitespace after it, rendered outside the animated element. */
    ws: string;
    /** Index into `runs` for words; -1 for atoms. */
    run: number;
    atom?: StreamAtom;
}
export interface StreamModel {
    runs: StreamRun[];
    units: StreamUnit[];
}
/** Links render only for schemes a page can open safely; anything else stays text. */
export declare function safeHref(href: string | undefined): string | undefined;
/** Hosts rebuild their inline arrays on every update, so atoms compare by value. */
export declare function atomKey(atom: StreamAtom): string;
/**
 * The units a stream of `content` releases, in order. Space that opens a run
 * belongs after the unit before it, so it sits between the two instead of
 * inside the next word's entrance.
 */
export declare function buildStreamModel(content: string | StreamInline[] | undefined, locale?: string): StreamModel;
/**
 * The first `count` units of a model as inlines that build back into exactly
 * those units, whitespace included. A parent that paces several streams on one
 * clock hands each of them such a prefix.
 */
export declare function sliceStreamContent(model: StreamModel, count: number): StreamInline[];