DefinitelyTyped/types/circuit-breaker-js/circuit-breaker-js-tests.ts

import CircuitBreaker = require('circuit-breaker-js');

const breaker = new CircuitBreaker();
breaker.isOpen();

const options: CircuitBreaker.Options = {};

let status: number = CircuitBreaker.CLOSED;
status = CircuitBreaker.OPEN;

breaker.forceOpen();
breaker.forceClose();

breaker.run((success, failure) => {
    if (Math.random() > 0.5) {
        success();
    } else {
        failure();
    }
});