export interface OAuthClientCredentialsFromEnv {
    clientId?: string;
    clientSecret?: string;
    tokenUrl?: string;
    scopes?: string[];
    tokenAuthMethod?: 'client_secret_basic' | 'client_secret_post';
}
export interface HttpAuthCredentialsFromEnv {
    token?: string;
    username?: string;
    password?: string;
}
export declare function normalizeEnvSegment(value: string): string;
export declare function apiPrefix(apiName: string): string;
export declare function schemePrefix(apiName: string, schemeName: string): string;
export declare function readApiBaseUrl(apiName: string, env?: NodeJS.ProcessEnv): string | undefined;
export declare function readApiExtraHeaders(apiName: string, env?: NodeJS.ProcessEnv): Record<string, string>;
export declare function readApiKeyValue(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): string | undefined;
export declare function readOAuthClientCredentials(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): OAuthClientCredentialsFromEnv;
export declare function readOAuthPasswordCredentials(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): {
    username?: string;
    password?: string;
};
export declare function readOAuthAccessToken(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): string | undefined;
export declare function readOAuthAuthMethod(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): 'device_code' | 'authorization_code' | undefined;
export declare function readOAuthDeviceAuthEndpoint(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): string | undefined;
export declare function readOAuthRedirectPort(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): number | undefined;
export declare function readOAuthPkce(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): boolean | undefined;
export declare function readHttpAuthCredentials(apiName: string, schemeName: string, env?: NodeJS.ProcessEnv): HttpAuthCredentialsFromEnv;