Facing issues with typescript multi hierarchy key map pair

Question

How do I change this structure so that I can get the values of this object like a map this is my const object

const dependencyMetrics : {[dependancyName : string] :  {[name : string] : MetricInfo }[]} = {
    MyService : [{
        failure : {
            metric: new Metric({
                namespace: 'namespace',
                metricName: 'ABC'
            }),
            metricProperties: {
                period: Duration.seconds(60),
                statistic: 'Average'
            }
        },
        time : {
            metric: new Metric({
                namespace: 'namespace',
                metricName: 'age'
            }),
            metricProperties: {
                period: Duration.seconds(60),
                statistic: 'Average'
            }
        }
    }]};
//I am using this  also as a type : 
type MetricInfo = {
    metric  : Metric;
    metricProperties : MetricOptions;
}

What I want is this code to behave smoothly when I try some thing like : dependencyMetric.MyService.failure or dependencyMetric.MyService.time

currently getting a lot of Objects and stuff don't know how to make this a hierarchy map

Answer 1

Your current structure treats MyService as a key for an array of objects. Which is why your getting unexpected results when trying to access failure or time

From what i understood, you want MyService to be a key for an object containing failure and time metrics, not an array.

Try this:

const dependencyMetrics : {[dependencyName : string] :  {[name : string] : MetricInfo }} = {
    MyService : {
        failure : {
            metric: new Metric({
                namespace: 'namespace',
                metricName: 'ABC'
            }),
            metricProperties: {
                period: Duration.seconds(60),
                statistic: 'Average'
            }
        },
        time : {
            metric: new Metric({
                namespace: 'namespace',
                metricName: 'age'
            }),
            metricProperties: {
                period: Duration.seconds(60),
                statistic: 'Average'
            }
        }
    }
};

Your MetricInfo type will stay the same

Edit:

First, to add more services to your dependencyMetrics object, you can just include them in the object:

const dependencyMetrics : {[dependencyName : string] :  {[name : string] : MetricInfo }} = {
    MyService1 : {
        // ...metrics for MyService1
    },
    MyService2 : {
        // ...metrics for MyService2
    },
    // add as many services as you need
};

Then, to access the metrics of a specific service dynamically, you can use the bracket notation to get the value associated with a key:

let serviceName = 'MyService1';  // change this to the service name you want
let metricName = 'failure';  // change this to the metric you want

let specificMetric = dependencyMetrics[serviceName][metricName];