export declare const TaskError: import("@-xun/error").SpecificErrorClassConstructor<{
  name: string;
  message: string;
  stack?: string;
  cause?: unknown;
}> & import("@-xun/error").NamedErrorConstructorStaticProperties<{
  name: string;
  message: string;
  stack?: string;
  cause?: unknown;
}>;
/**
 * An `Error` class where the first letter of the message is capitalized.
 */
export type TaskError = InstanceType<typeof TaskError>;
/**
 * A collection of possible error and warning messages.
 */
export declare const CliErrorMessage: {
  GuruMeditation(): string;
  UnsupportedCommand(): string;
  CommandDidNotComplete(command: string): string;
  IgnoredOptions(args: string[]): string;
  BadOptionValue(name: string, value: unknown, context?: string): string;
};
/**
 * Throw a {@link CliError} with the given string message, which
 * causes Black Flag to exit with the {@link FrameworkExitCode.DefaultError}
 * status code.
 *
 * Use this function to assert end user error.
 */
export declare function softAssert(message: string): never;
/**
 * If `value` is falsy, throw a {@link CliError} with the given string message,
 * which causes Black Flag to exit with the
 * {@link FrameworkExitCode.DefaultError} status code.
 *
 * Use this function to assert end user error.
 */
export declare function softAssert(value: unknown, message: string): asserts value;
/**
 * Throw a so-called "FrameworkError" with the given string message, which
 * causes Black Flag to exit with the {@link FrameworkExitCode.AssertionFailed}
 * status code.
 *
 * Use this function to throw developer errors that end users can do nothing
 * about.
 */
export declare function hardAssert(message: string): never;
/**
 * If `value` is falsy, throw a so-called "FrameworkError" with the given string
 * message, which causes Black Flag to exit with the
 * {@link FrameworkExitCode.AssertionFailed} status code.
 *
 * Use this function to assert developer errors that end users can do nothing
 * about.
 */
export declare function hardAssert(value: unknown, message: string): asserts value;