@basic-streams/take-until/index.js

takeUntil operator for basic-streams

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function noop() { }
function takeUntil(controller, stream) {
    return function (cb) {
        var state = { cb: cb };
        function stop() {
            if (state !== null) {
                var controllerDisposer_1 = state.controllerDisposer, sourceDisposer = state.sourceDisposer;
                state = null;
                if (controllerDisposer_1) {
                    controllerDisposer_1();
                }
                if (sourceDisposer) {
                    sourceDisposer();
                }
            }
        }
        function onEvent(x) {
            if (state !== null) {
                var cb_1 = state.cb;
                cb_1(x);
            }
        }
        var controllerDisposer = controller(stop);
        if (state === null) {
            controllerDisposer();
            stream(noop)();
        }
        else {
            state.controllerDisposer = controllerDisposer;
            var sourceDisposer = stream(onEvent);
            if (state === null) {
                sourceDisposer();
            }
            else {
                state.sourceDisposer = sourceDisposer;
            }
        }
        return stop;
    };
}
exports.default = takeUntil;