Node.js 15 makes 7 of my packages obsolete. This is a good thing.

1. https://github.com/sindresorhus/delay

You can await setTimeout now:

const {setTimeout} = require('timers/promises');

await setTimeout(1000);

2. https://github.com/sindresorhus/p-cancelable

Node.js now supports AbortController: https://developer.mozilla.org/en-US/docs/Web/API/AbortController

3. https://github.com/sindresorhus/p-any

This was added to JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/any

4. https://github.com/sindresorhus/aggregate-error

This was also added to JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AggregateError

5. https://github.com/sindresorhus/replace-string

This was also added to JavaScript: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replaceAll

6. https://github.com/sindresorhus/loud-rejection
7. https://github.com/sindresorhus/hard-rejection

Node.js now throws on unhandled Promise rejections.

Node.js 15 highlights: https://nodejs.medium.com/node-js-v15-0-0-is-here-deb00750f278

I think it's great that we now get a larger "standard library". The benefit is that many of these things have been proven in user-land/production for years before being added, so we already know they are useful and work.

Some more things I'd like to see in Node.js:
- Fetch
- Web Streams
- Web Crypto
- Globbing

And in JS:
- Promisification of existing APIs
- UUID generation
- https://github.com/sindresorhus/p-map (with concurrency option)
- Escape regex method
- Better Unicode-aware string handling, like https://github.com/sindresorhus/string-length
- BigDecimal

To be clear, I have no intention of deprecating any of the mentioned packages for a long time. They will be maintained for many years to come. But when projects can target Node.js 16 (15 is not LTS), they can replace these with native which results in a smaller dependency tree.