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They did create a polyfill, but the readme says it was based on design input from other projects, not on aligning multiple existing designs. This at least soun

• troupo 3y ago
  > where they already existed in multiple libraries Signals exist in multiple libraries with what are really minor variations on the theme. > before the Promises/A design came out. That's why the current proposal asks for input about design. IIRC, promises also had multiple iterations on the design. There were calls to make them more monadic, less monadic, cancelable, non-cancelable etc. And the original proposal looks nothing like the eventual API: https://groups.google.com/g/commonjs/c/6T9z75fohDk https://groups.google.com/g/commonjs/c/6T9z75fohDk [1] And new things are still being added to them (like Promise.withResolvers etc.) [1] There's a great long presentation on the history of promises here: https://samsaccone.com/posts/history-of-promises.html https://samsaccone.com/posts/history-of-promises.html