84 lines
2.0 KiB
JavaScript
84 lines
2.0 KiB
JavaScript
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/* global __resourceQuery */
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"use strict";
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if (typeof EventSource !== "function") {
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throw new Error(
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"Environment doesn't support lazy compilation (requires EventSource)"
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);
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}
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var urlBase = decodeURIComponent(__resourceQuery.slice(1));
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/** @type {EventSource | undefined} */
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var activeEventSource;
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var activeKeys = new Map();
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var errorHandlers = new Set();
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var updateEventSource = function updateEventSource() {
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if (activeEventSource) activeEventSource.close();
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if (activeKeys.size) {
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activeEventSource = new EventSource(
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urlBase + Array.from(activeKeys.keys()).join("@")
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);
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/**
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* @this {EventSource}
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* @param {Event & { message?: string, filename?: string, lineno?: number, colno?: number, error?: Error }} event event
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*/
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activeEventSource.onerror = function (event) {
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errorHandlers.forEach(function (onError) {
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onError(
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new Error(
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"Problem communicating active modules to the server: " +
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event.message +
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" " +
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event.filename +
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":" +
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event.lineno +
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":" +
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event.colno +
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" " +
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event.error
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)
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);
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});
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};
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} else {
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activeEventSource = undefined;
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}
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};
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/**
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* @param {{ data: string, onError: (err: Error) => void, active: boolean, module: module }} options options
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* @returns {() => void} function to destroy response
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*/
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exports.keepAlive = function (options) {
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var data = options.data;
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var onError = options.onError;
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var active = options.active;
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var module = options.module;
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errorHandlers.add(onError);
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var value = activeKeys.get(data) || 0;
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activeKeys.set(data, value + 1);
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if (value === 0) {
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updateEventSource();
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}
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if (!active && !module.hot) {
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console.log(
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"Hot Module Replacement is not enabled. Waiting for process restart..."
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);
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}
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return function () {
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errorHandlers.delete(onError);
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setTimeout(function () {
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var value = activeKeys.get(data);
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if (value === 1) {
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activeKeys.delete(data);
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updateEventSource();
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} else {
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activeKeys.set(data, value - 1);
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}
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}, 1000);
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};
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};
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