I do have to maintain libraries in several languages, basically every JetBrains IDE has built-in first-class support for JS/TypeScript + all popular Web file formats irrespective of whatever backend language you're developing in.

For C#, F# & VB I use Rider.

For Dart, Java & Kotlin I use Android Studio, but if I need to do a lot of development with Java/Kotlin I'll bounce to IDEA.

For TypeScript/JS npm projects I use VS Code for small changes, but bounce to WebStorm for longer sessions.

For the Swift package I use Xcode for development & VS Code for git, update docs & run publish scripts. Unfortunately ran into issues trying to build my project with AppCode.

For all other languages (used to develop project templates & packages for https://gist.cafe) I'll use VS Code, but that's mainly because I don't have the IDE installed. If I had to spend more than a couple of days working on a language that JetBrains offers a dedicated IDE for I'll most likely be installing & trying that out, before falling back to VS Code (JetBrains All Products Pack + Unified Toolbox Updates makes this effortless & feasible).

Jetbrains provides plugins for Intellij that support almost every other language they have a "dedicated IDE" for. That's what I do and it supports almost every language I throw at it. The exceptions that I know of are Rider and parts of Android Studio

It’s worth noting you can set up shared settings between every Jetbrains IDE which will sync up all of your keybindings, color schemes, etc.

I've never got it to work reliably between different types of IDEs (Android Studio and Intellij for example)

I think the vast majority of devs work in a single language, at least on a day to day basis.

I wish JetBrains looked exactly into that, and deliver one IDE with above (^^^).

I don’t since you end up with either complex configuration to surface language specific tasks. Having well thought out defaults, tools, etc by separating them out into different IDEs allows for ease of use you couldn’t get with one IDE to rule them all approach. Yes, they sell different IDEs that share a large core but I think the incentives are well aligned for sustainable business focused on developer satisfaction.

Nah. Would have to disagree on this front. These should still work. After all each language/runtime is defined by some underlying template (for example in Visual Studio - .vcxproj for C++, .csproj for C# in .NET, etc.). I don't see reason all of this to work under one Umbreall IDE, even if I have to pay more for it - I'd rather pay for it, than the bundle I'm getting now.

if you use intelliJ ultimate edition you have official plusing for all languages for ex: I work on golang, scala, python and JS using intellij ultimate.

I have to look again, but I don't think C++ and Rust were available from there...

There is an Intellij official plugin for Rust. https://plugins.jetbrains.com/plugin/8182-rust