import type { SafeHooksWrapper } from "./Hooks";
/**
 * Specifies event severity levels for the `IConfigCatLogger` interface.
 * The levels are interpreted as minimum levels in the case of event filtering.
*/
export declare enum LogLevel {
    /** All events are logged. */
    Debug = 4,
    /** Info, Warn and Error are logged. Debug events are discarded. */
    Info = 3,
    /** Warn and Error events are logged. Info and Debug events are discarded. */
    Warn = 2,
    /** Error events are logged. All other events are discarded. */
    Error = 1,
    /** No events are logged. */
    Off = -1
}
export declare type LogEventId = number;
/** Represents a log message format with named arguments. */
export declare class FormattableLogMessage {
    readonly strings: ReadonlyArray<string>;
    readonly argNames: ReadonlyArray<string>;
    readonly argValues: ReadonlyArray<unknown>;
    static from(...argNames: string[]): (strings: TemplateStringsArray, ...argValues: unknown[]) => FormattableLogMessage;
    private cachedDefaultFormattedMessage?;
    constructor(strings: ReadonlyArray<string>, argNames: ReadonlyArray<string>, argValues: ReadonlyArray<unknown>);
    get defaultFormattedMessage(): string;
    toString(): string;
}
export declare type LogMessage = string | FormattableLogMessage;
/** Defines the interface used by the ConfigCat SDK to perform logging. */
export interface IConfigCatLogger {
    /** Gets the log level (the minimum level to use for filtering log events). */
    readonly level?: LogLevel;
    /** Gets the character sequence to use for line breaks in log messages. Defaults to "\n". */
    readonly eol?: string;
    /**
     * Writes an event into the log.
     * @param level Event severity level.
     * @param eventId Event identifier.
     * @param message Message.
     * @param exception The exception object related to the message (if any).
     */
    log(level: LogLevel, eventId: LogEventId, message: LogMessage, exception?: any): void;
}
export declare class LoggerWrapper implements IConfigCatLogger {
    private readonly logger;
    private readonly hooks?;
    get level(): LogLevel;
    get eol(): string;
    constructor(logger: IConfigCatLogger, hooks?: SafeHooksWrapper | undefined);
    isEnabled(logLevel: LogLevel): boolean;
    /** @inheritdoc */
    log(level: LogLevel, eventId: LogEventId, message: LogMessage, exception?: any): LogMessage;
    /**
     * Shorthand method for `logger.logEvent(LogLevel.Debug, 0, message);`
     */
    debug(message: string): void;
    configJsonIsNotPresent(defaultReturnValue: string): LogMessage;
    configJsonIsNotPresentSingle(key: string, defaultParamName: string, defaultParamValue: unknown): LogMessage;
    settingEvaluationFailedDueToMissingKey(key: string, defaultParamName: string, defaultParamValue: unknown, availableKeys: string): LogMessage;
    settingEvaluationError(methodName: string, defaultReturnValue: string, ex: any): LogMessage;
    settingEvaluationErrorSingle(methodName: string, key: string, defaultParamName: string, defaultParamValue: unknown, ex: any): LogMessage;
    forceRefreshError(methodName: string, ex: any): LogMessage;
    fetchFailedDueToInvalidSdkKey(sdkKey: string): LogMessage;
    fetchFailedDueToUnexpectedHttpResponse(statusCode: number, reasonPhrase: string): LogMessage;
    fetchFailedDueToRequestTimeout(timeoutMs: number, ex: any): LogMessage;
    fetchFailedDueToUnexpectedError(ex: any): LogMessage;
    fetchFailedDueToRedirectLoop(): LogMessage;
    fetchReceived200WithInvalidBody(ex: any): LogMessage;
    fetchReceived304WhenLocalCacheIsEmpty(statusCode: number, reasonPhrase: string): LogMessage;
    autoPollConfigServiceErrorDuringPolling(ex: any): LogMessage;
    settingForVariationIdIsNotPresent(variationId: string): LogMessage;
    configServiceCacheReadError(ex: any): LogMessage;
    configServiceCacheWriteError(ex: any): LogMessage;
    clientIsAlreadyCreated(sdkKey: string): LogMessage;
    userObjectIsMissing(key: string): LogMessage;
    dataGovernanceIsOutOfSync(): LogMessage;
    userObjectAttributeIsMissingPercentage(key: string, attributeName: string): LogMessage;
    userObjectAttributeIsMissingCondition(condition: string, key: string, attributeName: string): LogMessage;
    userObjectAttributeIsInvalid(condition: string, key: string, reason: string, attributeName: string): LogMessage;
    userObjectAttributeIsAutoConverted(condition: string, key: string, attributeName: string, attributeValue: string): LogMessage;
    configServiceCannotInitiateHttpCalls(): LogMessage;
    configServiceMethodHasNoEffectDueToDisposedClient(methodName: string): LogMessage;
    configServiceMethodHasNoEffectDueToOverrideBehavior(overrideBehavior: string, methodName: string): LogMessage;
    settingEvaluated(evaluateLog: string): LogMessage;
    configServiceStatusChanged(status: string): LogMessage;
}
export declare class ConfigCatConsoleLogger implements IConfigCatLogger {
    level: LogLevel;
    readonly eol: string;
    SOURCE: string;
    /**
     * Create an instance of ConfigCatConsoleLogger
     */
    constructor(level?: LogLevel, eol?: string);
    /** @inheritdoc */
    log(level: LogLevel, eventId: LogEventId, message: LogMessage, exception?: any): void;
}
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