data-collectors/lib/queries/first.js

A collection of composable reduction operations for arbitrary streams of values

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const collector_1 = require("../collector");
function first() {
    return collector_1.Collector.of(() => ({ value: null }), (state, item) => state.value === null ? state.value = item : void 0, (stateA, stateB) => ({ value: stateA.value != null ? stateA.value : stateB.value }), state => state.value);
}
exports.first = first;
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