/**
 * Tiny pure-JS layer over the page-localStorage key
 * `slicc_oauth_extra_domains`. Same shape and key the webapp's
 * `provider-settings.ts` uses; this module exists so the options page
 * (`secrets.html` / `secrets-entry.ts`) can share the same backend
 * without pulling in the full provider-settings module (which would
 * fan out into a heavy bundle).
 *
 * Both pages live at chrome-extension://<id>/* so they hit the same
 * localStorage. Updates here are visible to the side panel on its next
 * read (no chrome.runtime round-trip needed).
 */
export declare const OAUTH_EXTRA_DOMAINS_KEY = "slicc_oauth_extra_domains";
export type OAuthExtraDomainsStore = Record<string, string[]>;
export interface LocalStorageLike {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
}
export declare function readOAuthExtras(storage: LocalStorageLike): OAuthExtraDomainsStore;
export declare function writeOAuthExtras(storage: LocalStorageLike, store: OAuthExtraDomainsStore): void;
export declare function addOAuthExtraDomain(storage: LocalStorageLike, providerId: string, domain: string): {
    added: boolean;
    reason?: string;
};
export declare function removeOAuthExtraDomain(storage: LocalStorageLike, providerId: string, domain: string): {
    removed: boolean;
};
export declare function clearOAuthExtras(storage: LocalStorageLike, providerId: string): void;
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