# Performance Tracking

## Function Performance Tracking

```ts
import { environment } from "../../environments/environment";
export function FunctionPerformanceTracking() {
  return function (target, name, descriptor) {
    if (environment.production) {
      return;
    }

    // console.log(target)
    // console.log(name)
    console.log(descriptor);
    const orig = descriptor.value;
    console.log(orig);
    descriptor.value = function (...args) {
      const start = performance.now();
      orig.apply(this, args);
      const stop = performance.now();
      console.log(`${name} | ${(stop - start).toFixed(2)}`);
    };
  };
}
```

## General

```ts
import { environment } from "../../environments/environment";
export function PerformanceTracking(): ClassDecorator {
  return function (constructor: any) {
    if (environment.production) {
      return;
    }

    const component = constructor.name;
    console.log(`Component: ${component}`);

    const original = constructor.prototype;
    constructor.prototype = function (...args: any) {
      const start = performance.now();
      original.apply(this, args);
      const stop = performance.now();
      console.log(`${component} | ${(stop - start).toFixed(2)}`);
    };

    // console.log(`prototype: ${constructor.prototype['constructor']}`)

    // for (const key of Object.keys(constructor.prototype)) {
    //   console.log(key)
    // }

    const lifecycleHooks = [
      "ngOnInit",
      "ngDoCheck",
      "ngAfterViewChecked",
      "ngOnDestroy",
    ];

    lifecycleHooks.forEach((hook) => {
      const original = constructor.prototype[hook];
      //   console.log(`Orgiginal: ${original}`)

      constructor.prototype[hook] = function (...args: any) {
        console.log(`${component} | ${hook}`);
        if (hook === "ngOnInit") {
          // start performance measurement of component
        } else if (hook === "ngDoCheck") {
          // start measurement of checking cycle
        } else if (hook === "ngAfterViewChecked") {
          // end measurement of checking cycle
        } else if (hook === "ngOnDestroy") {
          // end performance measurement for component
        }

        // eslint-disable-next-line no-unused-expressions
        original && original.apply(this, args);
      };
    });
  };
}
```


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