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rOACCT/node_modules/webpack/hot/lazy-compilation-web.js
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lazy-compilation-web.js
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			/* global __resourceQuery */

			"use strict";

			if (typeof EventSource !== "function") {
			throw new Error(
			"Environment doesn't support lazy compilation (requires EventSource)"
			);
			}

			var urlBase = decodeURIComponent(__resourceQuery.slice(1));
			var activeEventSource;
			var activeKeys = new Map();
			var errorHandlers = new Set();

			var updateEventSource = function updateEventSource() {
			if (activeEventSource) activeEventSource.close();
			if (activeKeys.size) {
			activeEventSource = new EventSource(
			urlBase + Array.from(activeKeys.keys()).join("@")
			);
			activeEventSource.onerror = function (event) {
			errorHandlers.forEach(function (onError) {
			onError(
			new Error(
			"Problem communicating active modules to the server: " +
			event.message +
			" " +
			event.filename +
			":" +
			event.lineno +
			":" +
			event.colno +
			" " +
			event.error
			)
			);
			});
			};
			} else {
			activeEventSource = undefined;
			}
			};

			exports.keepAlive = function (options) {
			var data = options.data;
			var onError = options.onError;
			var active = options.active;
			var module = options.module;
			errorHandlers.add(onError);
			var value = activeKeys.get(data) \|\| 0;
			activeKeys.set(data, value + 1);
			if (value === 0) {
			updateEventSource();
			}
			if (!active && !module.hot) {
			console.log(
			"Hot Module Replacement is not enabled. Waiting for process restart..."
			);
			}

			return function () {
			errorHandlers.delete(onError);
			setTimeout(function () {
			var value = activeKeys.get(data);
			if (value === 1) {
			activeKeys.delete(data);
			updateEventSource();
			} else {
			activeKeys.set(data, value - 1);
			}
			}, 1000);
			};
			};