Reactive Utilties

from

function from<T>(
  producer:
    | ((setter: (v: T) => T) => () => void)
    | {
        subscribe: (
          fn: (v: T) => void
        ) => (() => void) | { unsubscribe: () => void }
      }
): () => T | undefined

A helper to make it easier to interop with external producers like RxJS observables or with Svelte Stores. This basically turns any subscribable (object with a subscribe method) into a Signal and manages subscription and disposal.

const signal = from(obsv$)

It can also take a custom producer function where the function is passed a setter function that returns a unsubscribe function:

const clock = from((set) => {
  const interval = setInterval(() => {
    set((v) => v + 1)
  }, 1000)

  return () => clearInterval(interval)
})

Arguments

Name	Type	Description
producer	`((setter: (v: T) => T) => () => void) \| { subscribe: (fn: (v: T) => void) => (() => void) \| { unsubscribe: () => void }; }`	The producer function or subscribable object

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