detect-browser | Unpack a browser type and version from the useragent string | Runtime Evironment library

The most popular question for this has many answers, but sadly I can't find one that works properly. Most responses are from 10 years ago, some don't even work:

Detect browser or tab closing

There are also many variations of the same bit of code (for example, some add "e.returnValue='';" to the code, while many others don't.

What is the best way to do this detection? Is it beforeunload still? How would the code look like in 2021 to cover modern browsers/behaviors?

(To avoid an XY problem, I want to show a confirmation popup if the user tries to close the page. The popup is easy, the detection is not.)

when i try to build my project with yarn run build i get errors that are not exist in my code my code is clean it works fine in my local. I've been stuck for two weeks to resolve this problem please help me to solve this problem. this the errors that i get

node version: v10.15.3

webpack: 4.30.0 this is my package.json

I'm using the latest versions of all Angular-related packages (so Angular 10).

I want to add some code to a component, but I only want this code to exist in dev, never in a production build. It needs to be completely stripped in prod builds. I found this comment, which indicates that environments do this automatically (because they're const).

I tried using that exact code in my app, but the dev code is still there in a production build. I copied the code over to a new test app that I made with ng new, and it does work properly there.

What things should I be looking for, how can I fix this? Is this possibly because I have CommonJS dependencies, and if so, can I do anything about that (since I can't remove those dependencies)?

Some notes:

• An issue has been opened on the angular-cli repo here.
• The environment object is never written to anywhere in the codebase, I've searched thoroughly. (It's only used in a few places anyway.)
• Code bounded with if (false) { } is properly stripped.
• Removing the services export from the end of environment{.prod}.ts does not fix the problem.
• Removing all CommonJS dependencies does not fix the problem.

Here's environment.prod.ts (environment.ts is the same, just with false instead of true):

After update to angular 9 and universal 9, a got error when i run npm run build:ssr && npm run serve:ssr

I using "Detect browser wrapped lines via javascript" as a way to wrap each line in a . However, I'm having a problem if there's more than one element to split and wrap.

For example: If I have more than one section to split and wraps like:

I found JS code from "Detect browser wrapped lines via javascript" but it will wrap white-spaces into a span. I'm using this code on a WordPress site and I cannot reciprocate the problem anywhere else. I tried to sanitize the code but that didn't work as well.

Is there a way to check if a span is blank and remove the span?

I have a JS code that I got from "Detect browser wrapped lines via javascript" that wraps each line into a . It works when there's one set of text to wrap inside a

You can see in my example code below, the first set of text will work (green line above the text) but the second set will not.