Naturally the answers to your question depend on who is looking at the website, but from my experience…

Does the ideology of ‘using other people’s tools to create a better product’ apply here in this context

Yes.

or would it be considered plagiarism?

Absolutely not. It’s showing that you can incorporate the works of others to build something great rather than spend time reinventing the wheel. Nobody’s going to look at your website’s source (assuming you link to it somewhere), see a bunch of .ts or .jsx files, and think “oh this person invented Typescript/React/whatever”.

Should you need to reinvent Javascript, your browser, your OS, etc…? Probably not, and as long as you’re using something built by others to build your website (vscode, node.js, etc), there’s no reason to feel like using a library would be the same. Also, for most real world projects, you’ll be using libraries you didn’t write. This is just showing that you know how to use them.

Where it would be unacceptable is if you claimed to have created those libraries/tools yourself.