/**
 * Either extracts the error message out of an error, or converts
 * the value passed in into a string.
 */
export declare function getErrorMessage(e: unknown | Error): string;
/**
 * Check if a parameter is defined. If not, it throws an error.
 * @param parameter Parameter to be checked.
 * @param parameterName Name of the parameter.
 */
export declare function requireDefinedParameter(parameter: unknown, parameterName: string): void;
export declare function isError(err: unknown): err is Error;
/**
 * Takes an error, and continues yielding errors by tracing the chain of
 * '.cause' properties on the error object.
 * Finally yields a "rootCause" object for Rollbar to log as a custom
 * property.
 */
export declare function causalChain(err: Error): Generator<Error | {
    rootCause: string;
}>;
//# sourceMappingURL=Errors.d.ts.map