apollo-client-rxjs/utils/variables.js

Adds RxJS to ApolloClient

import { Observable } from 'rxjs/Observable';
import { switchMap } from 'rxjs/operator/switchMap';
import { combineLatest } from 'rxjs/observable/combineLatest';
import { omit } from './helpers';
import { ObservableQueryRef } from './ObservableQueryRef';
import { RxObservableQuery } from '../RxObservableQuery';
export function createWithObservableVariables(options, mapFn) {
    var observableQueryRef = new ObservableQueryRef();
    var varObs = observeVariables(options.variables);
    return new RxObservableQuery(observableQueryRef, function (subscriber) {
        var sub = switchMap.call(varObs, (function (newVariables) {
            var cleanOptions = omit(options, 'variables');
            var newOptions = Object.assign(cleanOptions, { variables: newVariables });
            observableQueryRef.setRef(mapFn(newOptions));
            return observableQueryRef.getRef();
        })).subscribe(subscriber);
        return function () { return sub.unsubscribe(); };
    });
}
export function observeVariables(variables) {
    var keys = Object.keys(variables);
    return Observable.create(function (observer) {
        combineLatest.call(undefined, mapVariablesToObservables(variables))
            .subscribe(function (values) {
            var resultVariables = {};
            values.forEach(function (value, i) {
                var key = keys[i];
                resultVariables[key] = value;
            });
            observer.next(resultVariables);
        });
    });
}
function mapVariablesToObservables(variables) {
    return Object.keys(variables)
        .map(function (key) { return getVariableToObservable(variables[key]); });
}
function getVariableToObservable(variable) {
    if (variable instanceof Observable) {
        return variable;
    }
    else if (typeof variable !== 'undefined') {
        return new Observable(function (subscriber) {
            subscriber.next(variable);
        });
    }
    else {
        return new Observable(function (subscriber) {
            subscriber.next(null);
        });
    }
}
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