It turns out, JavaScript provides a method of "trapping" nearly any operation on an object - property access, assignment, enumeration, and even property deletion. How? Via a Proxy. Think of a Proxy as a "hook" or "middleware" that can be used to gaslight the caller into seeing the proxied object any way you want them to see it. When you wrap an object in a Proxy, you can do almost anything you imagine - hide properties like I did with goodbye above, invent new "virtual" properties, or even make operations on properties "cursed":

I made a small rate limiter for JS. It's about 1 KB, has no dependencies and runs on Node, Bun, Deno and Cloudflare Workers.

It uses GCRA, so each key is just one timestamp instead of a counter plus a timer. Nothing runs in the background. Keys you've already seen don't allocate either, since the timestamps live in a Float64Array.

import { limito } from 'limito'

const rl = limito({ limit: 100, window: '1m' })
const wait = rl('user:42') // 0 if allowed, otherwise ms to wait

There's also a Redis version for when you have multiple servers, and small middlewares for Express and Hono.

MIT licensed, still early (0.5). Feedback and bug reports welcome.

hello

I need to create in javascript something to change a color to transparent, on PNG
I'd like to create a form that, when I post a picture, everything white should be transformed to transparent and generated as a new PNG, however this white is coming from a picture so it won't be exactly white
but contrast are good since this will pictures of text written on a white page
maybe some king of green screen algo

any ideas on how to do that ?