export type UpstreamAuth = {
    kind: "bearer";
    token: string;
} | {
    kind: "header";
    name: string;
    value: string;
};
export type UpstreamTarget = {
    baseUrl: string;
    auth: UpstreamAuth;
};
export declare const resolveUpstream: (key: string) => UpstreamTarget | null;
export declare const listUpstreamKeys: () => string[];
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