/**
 * The shape of a successful OAuth2 token response.
 */
export declare class OAuthTokenHttpError extends Error {
    readonly statusCode: number;
    readonly errorCode?: string;
    constructor(statusCode: number, body: string);
}
export interface OAuthTokenResponse {
    access_token: string;
    /** RECOMMENDED but not required by OAuth2, and some servers send it as a string. */
    expires_in?: number | string;
}
/**
 * Requests an access token from an OAuth2 token endpoint using the client credentials flow.
 * @param tokenEndpoint - The token endpoint URL.
 * @param clientId - The client identifier.
 * @param clientSecret - The client secret.
 * @param skipTlsValidation - Whether to skip TLS certificate chain validation.
 * @returns The parsed token response; rejects when the request fails or the response is not a valid token.
 */
export declare function fetchOAuthAccessToken(tokenEndpoint: string, clientId: string, clientSecret: string, skipTlsValidation: boolean): Promise<OAuthTokenResponse>;
/**
 * Describes a request error. Connecting to a host that resolves to several addresses, such as
 * localhost, fails with an AggregateError whose own message is empty.
 * @param error - The request error.
 * @returns A description that names the failure.
 */
export declare function describeRequestError(error: Error): string;
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