export declare class ErrorBoundary {
    private readonly errorCallback;
    private _error?;
    constructor(errorCallback: (err: Error) => void);
    /**
     * Executes callback() and then runs errorCallback() on error.
     * This will never throw but instead return `errorValue` if an error occurred.
     */
    try<T, E>(callback: () => T, errorValue?: E): T | typeof errorValue;
    reportError(err: Error): void;
    get error(): Error | undefined;
}
export declare function tests(): {
    "catches sync error": (assert: any) => void;
    "return value of callback is forwarded": (assert: any) => void;
    "catches async error": (assert: any) => Promise<void>;
    "exception in error callback is swallowed": (assert: any) => Promise<void>;
};