SOURCE

function njsFactory(scope = {}) {
    const utilName = 'NewJavaScript'
    const errorMessageRegext = new RegExp(`^${utilName}`)

    window.addEventListener('error', e => {
        if (!errorMessageRegext.test(e.error)) return

        e.preventDefault()
        e.stopPropagation()
    })

    function getThrowMessage(msg) {
        return `${utilName}:${msg}`
    }

    scope.whenReturn = function (expression) {
        if (expression) {
            throw getThrowMessage('whenReturn')
        }
    }


    return scope
}

const njs = njsFactory({})

void function () {
    console.log('ajax')
    njs.whenReturn(1 !== 200)

    console.log('do..')
}()