/**
 * Claude authentication settings and helpers
 * Extracted from settings.js for provider-specific isolation
 */
interface ClaudeProviderSettings {
    readonly anthropicApiKey?: string;
    readonly bedrockApiKey?: string;
    readonly bedrockRegion?: string;
}
interface Settings {
    readonly providerSettings?: {
        readonly claude?: ClaudeProviderSettings;
    };
}
/**
 * Validate an Anthropic API key format
 */
declare function isValidAnthropicKey(key: string | null | undefined): boolean;
/**
 * Check if Bedrock mode is active based on env and overrides
 */
declare function isBedrockMode(envOverrides?: NodeJS.ProcessEnv): boolean;
/**
 * Resolve Claude authentication environment variables from settings.
 * Bedrock takes priority over direct Anthropic API key and OAuth sessions.
 */
declare function resolveClaudeAuth(settings: Settings): NodeJS.ProcessEnv;
declare const _default: {
    ANTHROPIC_KEY_PREFIX: string;
    CLAUDE_AUTH_ENV_VARS: string[];
    isValidAnthropicKey: typeof isValidAnthropicKey;
    isBedrockMode: typeof isBedrockMode;
    resolveClaudeAuth: typeof resolveClaudeAuth;
};
export = _default;