export type EnvCredentialSourceStyle = 'health' | 'env';
export declare function hasConcreteEnvValue(value: string | undefined): boolean;
export declare function redactUrlForDiagnostics(value: string | undefined): string | undefined;
export declare function isEnabledEnvFlag(value: string | undefined): boolean;
export declare function collectEnvCredentialSources(env?: Record<string, string | undefined>, style?: EnvCredentialSourceStyle): string[];
//# sourceMappingURL=envCredentialSources.d.ts.map