/**
 * Explicit distributed token-cache acquisition.
 *
 * This module never imports, discovers, or constructs a provider. The selected
 * extension must already have registered `TokenCacheStore`
 * before standalone proxy startup reaches this boundary.
 */
import type { TokenCacheStore } from "../../extensions/cache/index.js";
export interface ExtensionCacheBootstrapDependencies {
    readEnv?: (name: string) => string | undefined;
    resolveStore?: () => TokenCacheStore | undefined;
}
/**
 * Ownership descriptor consumed by proxy startup. `created` remains in the
 * structural type for embedding composition roots that construct a store
 * before calling core, but core itself only returns `disabled` or `borrowed`.
 */
export type ExtensionTokenCacheStoreAcquisition = Readonly<{
    kind: "disabled";
    store: null;
}> | Readonly<{
    kind: "borrowed";
    store: TokenCacheStore;
}> | Readonly<{
    kind: "created";
    store: TokenCacheStore;
}>;
/**
 * Resolve an already-activated token-cache extension only when explicitly
 * selected with `CACHE_TYPE=extension`.
 */
export declare function acquireExtensionTokenCacheStoreFromEnv(dependencies?: ExtensionCacheBootstrapDependencies): Promise<ExtensionTokenCacheStoreAcquisition>;
/** Resolve only the selected store for composition roots that do not need ownership metadata. */
export declare function ensureExtensionTokenCacheStoreFromEnv(dependencies?: ExtensionCacheBootstrapDependencies): Promise<TokenCacheStore | null>;
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