@td-design/rn-hooks/lib/commonjs/useEventEmitter/index.js

从ahooks里面抽取的一些在rn项目里可以使用的hooks。提高开发效率

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var _tslib = require('../_virtual/_tslib.js');
var react = require('react');

var EventEmitter = /** @class */ (function () {
    function EventEmitter() {
        this.subscriptions = new Set();
    }
    EventEmitter.prototype.emit = function (val) {
        var e_1, _a;
        try {
            for (var _b = _tslib.__values(this.subscriptions), _c = _b.next(); !_c.done; _c = _b.next()) {
                var subscription = _c.value;
                subscription(val);
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
            }
            finally { if (e_1) throw e_1.error; }
        }
    };
    EventEmitter.prototype.useSubscription = function (cb) {
        var _this = this;
        var callbackRef = react.useRef();
        callbackRef.current = cb;
        react.useEffect(function () {
            function subscription(val) {
                if (callbackRef.current) {
                    callbackRef.current(val);
                }
            }
            _this.subscriptions.add(subscription);
            return function () {
                _this.subscriptions.delete(subscription);
            };
            // eslint-disable-next-line react-hooks/exhaustive-deps
        }, []);
    };
    return EventEmitter;
}());
function useEventEmitter() {
    var ref = react.useRef();
    if (!ref.current) {
        ref.current = new EventEmitter();
    }
    return ref.current;
}

exports.EventEmitter = EventEmitter;
exports.default = useEventEmitter;