/**
 * i18n context + reactive store (Sweep S13 #1418).
 *
 * The `Provider` builds an `I18nStore` from a server snapshot and puts it on a
 * Svelte context; `useI18n()` / `$t` / `<Trans>` read it synchronously. Browser
 * safe — interpolation uses the client's own dependency-free `renderTemplate`
 * (see ./render.ts) so the heavy languages package is never bundled client-side.
 */
import { type LanguageVariables } from './render.js';
/** A per-locale dictionary of message templates, as built on the server. */
export interface I18nSnapshot {
    /** The active locale (normalized BCP-47-ish tag). */
    locale: string;
    /** `key → template` for the active locale. Variables are applied client-side. */
    messages: Record<string, string>;
}
/**
 * Reactive holder for the active locale + message templates. Locale switching
 * (assigning `snapshot`) re-renders every `$t` / `<Trans>` reading this store.
 */
export declare class I18nStore {
    #private;
    constructor(snapshot?: Partial<I18nSnapshot>);
    get locale(): string;
    /** Replace the active snapshot (e.g. on a locale switch). */
    set snapshot(snapshot: I18nSnapshot);
    /**
     * Resolve and interpolate a message. Resolution order: server-snapshot
     * template → registered English default → the key itself (a loud,
     * never-blank fallback). Interpolation uses the same `renderTemplate` the
     * server uses, so `{var}` placeholders render identically.
     */
    t: (key: string, vars?: LanguageVariables) => string;
}
/** Create a store from a snapshot (used by `Provider`). */
export declare function createI18nContext(snapshot?: Partial<I18nSnapshot>): I18nStore;
/** Put an i18n store on context (used by `Provider`). */
export declare function setI18nContext(store: I18nStore): I18nStore;
/** Read the i18n store, or `null` when there is no `Provider` above. */
export declare function tryGetI18nContext(): I18nStore | null;
/** Read the i18n store, creating a default fallback if there is no Provider. */
export declare function getI18nContext(): I18nStore;
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