103 lines
2.8 KiB
TypeScript
103 lines
2.8 KiB
TypeScript
import express from 'express';
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import type { NextFunction, Request, Response } from 'express';
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import cors from 'cors';
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import { getBuildConfig, defaultOptions } from './util.js';
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import { context } from 'esbuild';
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import chokidar from 'chokidar';
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import { generateLangium } from '../.build/generateLangium.js';
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import { packageOptions } from '../.build/common.js';
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const configs = Object.values(packageOptions).map(({ packageName }) =>
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getBuildConfig({ ...defaultOptions, minify: false, core: false, entryName: packageName })
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);
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const mermaidIIFEConfig = getBuildConfig({
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...defaultOptions,
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minify: false,
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core: false,
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entryName: 'mermaid',
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format: 'iife',
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});
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configs.push(mermaidIIFEConfig);
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const contexts = await Promise.all(configs.map((config) => context(config)));
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const rebuildAll = async () => {
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console.time('Rebuild time');
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await Promise.all(contexts.map((ctx) => ctx.rebuild())).catch((e) => console.error(e));
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console.timeEnd('Rebuild time');
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};
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let clients: { id: number; response: Response }[] = [];
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function eventsHandler(request: Request, response: Response, next: NextFunction) {
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const headers = {
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'Content-Type': 'text/event-stream',
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Connection: 'keep-alive',
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'Cache-Control': 'no-cache',
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};
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response.writeHead(200, headers);
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const clientId = Date.now();
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clients.push({
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id: clientId,
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response,
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});
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request.on('close', () => {
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clients = clients.filter((client) => client.id !== clientId);
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});
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}
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let timeoutId: NodeJS.Timeout | undefined = undefined;
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/**
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* Debounce file change events to avoid rebuilding multiple times.
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*/
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function handleFileChange() {
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if (timeoutId !== undefined) {
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clearTimeout(timeoutId);
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}
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timeoutId = setTimeout(async () => {
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await rebuildAll();
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sendEventsToAll();
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timeoutId = undefined;
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}, 100);
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}
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function sendEventsToAll() {
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clients.forEach(({ response }) => response.write(`data: ${Date.now()}\n\n`));
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}
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async function createServer() {
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await generateLangium();
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handleFileChange();
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const app = express();
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chokidar
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.watch('**/src/**/*.{js,ts,langium,yaml,json}', {
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ignoreInitial: true,
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ignored: [/node_modules/, /dist/, /docs/, /coverage/],
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})
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.on('all', async (event, path) => {
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// Ignore other events.
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if (!['add', 'change'].includes(event)) {
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return;
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}
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if (/\.langium$/.test(path)) {
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await generateLangium();
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}
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console.log(`${path} changed. Rebuilding...`);
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handleFileChange();
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});
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app.use(cors());
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app.get('/events', eventsHandler);
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for (const { packageName } of Object.values(packageOptions)) {
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app.use(express.static(`./packages/${packageName}/dist`));
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}
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app.use(express.static('demos'));
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app.use(express.static('cypress/platform'));
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app.listen(9000, () => {
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console.log(`Listening on http://localhost:9000`);
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});
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}
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createServer();
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