add-query-parameters.js

export function addQueryParameters(url, parameters) {
    const separator = /\?/.test(url) ? "&" : "?";
    const names = Object.keys(parameters);
    if (names.length === 0) {
        return url;
    }
    return (url +
        separator +
        names
            .map(name => {
            if (name === "q") {
                return ("q=" +
                    parameters
                        .q.split("+")
                        .map(encodeURIComponent)
                        .join("+"));
            }
            return `${name}=${encodeURIComponent(parameters[name])}`;
        })
            .join("&"));
}