export declare abstract class ConfigVariable {
    abstract get Name(): string;
    abstract Value(option?: string): string;
}
export declare class DateTimeLogVariable extends ConfigVariable {
    get Name(): string;
    Value(option?: string): string;
}
export declare class DateLogVariable extends ConfigVariable {
    protected format?: string | undefined;
    constructor(format?: string | undefined);
    get Name(): string;
    Value(option?: string): string;
}
export declare class TimeLogVariable extends ConfigVariable {
    protected format?: string | undefined;
    constructor(format?: string | undefined);
    get Name(): string;
    Value(option?: string): string;
}
export declare class TimestampVariable extends ConfigVariable {
    get Name(): string;
    /**
     * @param option - 's' for unix seconds, otherwise milliseconds (default)
     */
    Value(option?: string): string;
}
export declare class UtcDateTimeLogVariable extends ConfigVariable {
    get Name(): string;
    Value(option?: string): string;
}
export declare class UtcDateLogVariable extends ConfigVariable {
    get Name(): string;
    Value(option?: string): string;
}
export declare class UtcTimeLogVariable extends ConfigVariable {
    get Name(): string;
    Value(option?: string): string;
}
export interface IConfigVariable {
    [key: string]: unknown | (() => unknown);
}
export interface IConfiguStatiVariables {
    message?: string;
}
export type ConfVariables = IConfiguStatiVariables & IConfigVariable;
/**
 * Formats layout by filling vars from customVars prop
 * eg `Hello world {datetime} {message}` will be formatted using values
 * from customVars
 *
 * NOTE: field message in custom vars will be formatted too.
 *
 * @param customVars - additional custom vars to look for, if it contains message field, it will format it too
 * @param layout - message layout
 * @returns
 */
export declare function format(customVars: ConfVariables | null, layout: string): string;
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