multitude/dist/push/utils/react.js

Comprehensive streams for push and pull

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useObservable = useObservable;
exports.usePropsMulticast = usePropsMulticast;

var _from = require("../creators/from");

var _Multicast = require("../classes/Multicast");

var _typeCore = require("type-core");

function useObservable(React, observable, projection) {
  const state = React.useState(0);
  const store = React.useMemo(() => {
    const members = {
      subscription: null,
      result: null,
      response: null
    };
    let i = 0;
    let open = false;
    let updated = false;

    function update(value) {
      updated = true;
      const previous = members.response;
      members.result = value;
      members.response = projection ? projection(value) : value;
      if (open && members.response !== previous) state[1](i = i + 1);
    }

    (0, _from.from)(_typeCore.TypeGuard.isFunction(observable) ? observable() : observable).subscribe({
      start(subscription) {
        members.subscription = subscription;
      },

      next(item) {
        update({
          success: true,
          done: false,
          data: item
        });
      },

      error(reason) {
        update({
          success: false,
          done: true,
          data: reason
        });
      },

      complete() {
        update(members.result && members.result.success ? {
          success: true,
          done: true,
          data: members.result.data
        } : {
          success: false,
          done: true,
          data: Error(`Observable completed before pushing any value`)
        });
      }

    });
    open = true;
    if (!updated && projection) members.response = projection(null);
    return members;
  }, []);
  React.useEffect(() => () => {
    if (store.subscription) store.subscription.unsubscribe();
  }, []);
  return store.response;
}

function usePropsMulticast(React, props, projection) {
  const store = React.useMemo(() => {
    let observer;
    const multicast = new _Multicast.Multicast(obs => {
      observer = obs;
    }, {
      replay: true
    }, {
      onCreate: connect => connect()
    });
    observer.next(projection ? projection(props) : props);
    return {
      props,
      observer,
      multicast
    };
  }, []);

  if (props !== store.props) {
    store.props = props;
    const value = projection ? projection(props) : props;
    if (value !== store.multicast.value) store.observer.next(value);
  }

  return store.multicast;
}
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projection(value) : (value as any);\n      if (open && members.response !== previous) state[1]((i = i + 1));\n    }\n\n    from(\n      TypeGuard.isFunction(observable) ? observable() : observable\n    ).subscribe({\n      start(subscription) {\n        members.subscription = subscription;\n      },\n      next(item) {\n        update({ success: true, done: false, data: item });\n      },\n      error(reason) {\n        update({ success: false, done: true, data: reason });\n      },\n      complete() {\n        update(\n          members.result && members.result.success\n            ? { success: true, done: true, data: members.result.data }\n            : {\n                success: false,\n                done: true,\n                data: Error(`Observable completed before pushing any value`)\n              }\n        );\n      }\n    });\n\n    open = true;\n    if (!updated && projection) members.response = projection(null);\n    return members;\n  }, []);\n\n  React.useEffect(\n    () => () => {\n      if (store.subscription) store.subscription.unsubscribe();\n    },\n    []\n  );\n\n  return store.response as U;\n}\n\nexport function usePropsMulticast<P, R = P>(\n  React: ReactHooksDependency,\n  props: P,\n  projection?: UnaryFn<P, R>\n): Push.Multicast<R> {\n  const store = React.useMemo(() => {\n    let observer: any;\n\n    const multicast = new Multicast(\n      (obs) => {\n        observer = obs;\n      },\n      { replay: true },\n      { onCreate: (connect) => connect() }\n    );\n\n    observer.next(projection ? projection(props) : props);\n\n    return { props, observer, multicast };\n  }, []);\n\n  if (props !== store.props) {\n    store.props = props;\n    const value = projection ? projection(props) : props;\n    if (value !== store.multicast.value) store.observer.next(value);\n  }\n\n  return store.multicast;\n}\n"]}