import type { X278Fetch } from "./http.cjs";
export interface SmartBackendToken {
    readonly accessToken: string;
    readonly tokenType: string;
    readonly expiresAt: number;
    readonly scope?: string;
}
export interface SmartConfiguration {
    readonly token_endpoint: string;
    readonly token_endpoint_auth_methods_supported?: ReadonlyArray<string>;
    readonly token_endpoint_auth_signing_alg_values_supported?: ReadonlyArray<string>;
    readonly scopes_supported?: ReadonlyArray<string>;
    readonly [key: string]: unknown;
}
export type SmartBackendAuthentication = {
    readonly method: "client-secret-basic";
    readonly clientSecret: string;
} | {
    readonly method: "client-secret-post";
    readonly clientSecret: string;
} | {
    readonly method: "private-key-jwt";
    readonly privateKeyPem?: string;
    readonly keyId?: string;
    readonly alg?: "RS384" | string;
    readonly signJwt?: (header: SmartJwtHeader, claims: SmartClientAssertionClaims) => string | Promise<string>;
    readonly assertionTtlSeconds?: number;
};
export interface SmartBackendTokenProviderOptions {
    readonly tokenEndpoint: string | URL;
    readonly clientId: string;
    readonly scopes: string | ReadonlyArray<string>;
    readonly authentication: SmartBackendAuthentication;
    readonly fetch?: X278Fetch;
    readonly now?: () => number;
    readonly randomUUID?: () => string;
    readonly cacheSkewSeconds?: number;
}
export interface SmartJwtHeader {
    readonly alg: string;
    readonly typ: "JWT";
    readonly kid?: string;
}
export interface SmartClientAssertionClaims {
    readonly iss: string;
    readonly sub: string;
    readonly aud: string;
    readonly exp: number;
    readonly iat: number;
    readonly jti: string;
}
export declare const createSmartBackendTokenProvider: (options: SmartBackendTokenProviderOptions) => (() => Promise<string>);
export declare const discoverSmartConfiguration: (fhirBaseUrl: string | URL, fetcher?: X278Fetch) => Promise<SmartConfiguration>;
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