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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm the author of xmpp.js and aria2.js.
I'm currently investigating alternatives to EventEmitter to support more JavaScript environments out of the box, namely deno and gjs.
I would recommend to try signals pattern which comes from action script. You can get inspired from https://github.com/millermedeiros/js-signals. As it can be implemented in 20 lines of code you can code your own version to match exactly what you need.
Readme: https://github.com/getify/revocable-queue#eventiterable