How to create HttpParams using object for HTTP request on Angular 4.3 using HttpClient

I have exactly angular version 4.3.2 and I cannot update because of dependencies. So for now I stick to this version. I have object with dynamic params (there can be other keys and values inside):

let query = {
param1: 1,
param2: 'a'
}


and I want to do something like:

params = new HttpParams();
params = params.append(query);
return this.httpClient.get(this.config.apiUrl + '/items', {
params: params,
headers: headers
});


but there is not such params.append(query) method. So I need to iterate over the query keys and to add them one by one to the params. Is there easier solution for this?

Edit1:

according this answer this can be done since angular 5.0.0-beta.6 (2017-09-03), but is not solution for me. https://stackoverflow.com/a/46317900/1995258

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