Class AssertionError

typings/node/node.d.ts:1804–1814

    function internal (value: any, message?: string): void;
    module internal {
        export class AssertionError implements Error {
            name: string;
            message: string;
            actual: any;
            expected: any;
            operator: string;
            generatedMessage: boolean;

            constructor(options?: {message?: string; actual?: any; expected?: any;
                                  operator?: string; stackStartFunction?: Function});
        }

        export function fail(actual?: any, expected?: any, message?: string, operator?: string): void;
        export function ok(value: any, message?: string): void;