trezy/firebase-system-update

export function parseQueryParams(queryStringOrURL) {
    const queryStringStartsAt = queryStringOrURL.indexOf('?')

    let queryString = queryStringOrURL

    if (queryStringStartsAt !== -1) {
        queryString = queryStringOrURL.substring(queryStringStartsAt + 1)
    }

    return queryString.split('&').reduce((accumulator, pair) => {
        const [key, value] = pair.split('=')

        if (accumulator[key]) {
            if (Array.isArray(accumulator[key])) {
                accumulator[key].push(value)
            } else {
                accumulator[key] = [accumulator[key], value]
            }
        } else {
            accumulator[key] = value
        }

        return accumulator
    }, {})
}