useOperation

useOperation<S>(operation: ObservableOperation<S> | undefined, onError?: (err: unknown) => void): S | undefined

A React hook that follows the state of an operation.

Parameters

Name	Type	Description
`operation`	`ObservableOperation<S> \| undefined`	Any generated operation handle.
`onError`	`(err: unknown) => void`	Optional. Receives a failure to observe.

Returns. S | undefined. The latest state of the operation. The final state stays after the stream ends.

Throws. The hook does not throw. A failure goes to onError and is never the outcome of the operation. The updates stream can report Storage, FederationClosed or Internal.

Example

example.tsx

tsx

import {
  useOperation,
  type LnReceiveOperationLike,
} from '@fedimint/react-native'

export function useInvoiceState(op: LnReceiveOperationLike | undefined) {
  return useOperation(op, (err) => console.log('operation watch', err)) 
}

Used in. Receive, step 04, Session, step 03

useOperation ​

useOperation