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What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

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Nx

https://nx.dev/

Nx is a suite of powerful, extensible dev tools to help you architect, test, and build at any scale — integrating seamlessly with modern technologies and libraries while providing a robust CLI, caching, dependency management, and more.

It has first-class support for many frontend and backend technologies, so its documentation comes in multiple flavours.

Principles

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import { Directive, ElementRef, Output, EventEmitter, HostListener } from '@angular/core';

@Directive({
  selector: '[appClickOutside]'
})
export class ClickOutsideDirective {
  @Output() appClickOutside: EventEmitter<any> = new EventEmitter();

  constructor(private _elementRef: ElementRef) {
  }