@dillonkearns/elm-graphql/examples/src/subscription/node_modules/@absinthe/socket/compat/cjs/notifier/observe.js.flow

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// @flow

import type {Notifier, Observer} from "../types";

const observe = <Result>(
  {observers, ...rest}: Notifier<Result>,
  observer: Observer<Result>
) => ({
  ...rest,
  observers: [...observers, observer]
});

export default observe;