_.mapObject is not supported in meteor

问题

_.mapObject is not supported in meteor. How to use _.mixin to work _.mapObject. Please refer to my code below

var result = _.mapObject(typesOverall, function(val, key) {
    return  _.reduce(val, function(memo, v) {
        return memo + v.val;
    }, 0) / val.length * 10;
})

来源：https://stackoverflow.com/questions/39153000/mapobject-is-not-supported-in-meteor