75 lines
2.4 KiB
TypeScript
75 lines
2.4 KiB
TypeScript
import type esbuild from 'esbuild'
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import type {IncomingMessage, ServerResponse} from 'http'
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export function createEsbuildLiveReloadTools(): {
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handleRequest(req: IncomingMessage, res: ServerResponse): boolean
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hasOpenConnections(): boolean
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esbuildBanner: esbuild.BuildOptions['banner']
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esbuildWatch: esbuild.WatchMode
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} {
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const openResponses = new Set<ServerResponse>()
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return {
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handleRequest(req, res) {
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// If special /esbuild url requested, subscribe clients to changes
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if (req.url === '/esbuild') {
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res.writeHead(200, {
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'Content-Type': 'text/event-stream',
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'Cache-Control': 'no-cache',
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Connection: 'keep-alive',
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})
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res.write('data: open\n\n')
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openResponses.add(res)
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res.on('close', () => openResponses.delete(res))
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return true // handled
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}
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return false
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},
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hasOpenConnections() {
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return openResponses.size > 0
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},
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esbuildBanner: {
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// Below uses function toString to insert raw source code of the function into the JS source.
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// This is being used so we can at least get a few type completions, but please understand that
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// you cannot reference any non-global browser values from within the function.
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js: `;(${function liveReloadClientSetup() {
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// from packages/playground/devEnv/createEsbuildLiveReloadTools.ts
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function connect() {
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try {
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const es = new EventSource('/esbuild')
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es.onmessage = (evt) => {
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switch (evt.data) {
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case 'reload':
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location.reload()
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break
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case 'open':
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console.log('%cLive reload ready', 'color: gray')
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break
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}
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}
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es.onerror = attemptConnect
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} catch (err) {
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attemptConnect()
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}
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}
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function attemptConnect() {
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setTimeout(() => connect(), 1000)
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}
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attemptConnect()
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}.toString()})();`,
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},
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esbuildWatch: {
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onRebuild(error, res) {
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if (!error) {
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if (openResponses.size > 0) {
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console.error(`Reloading for ${openResponses.size} clients...`)
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// Notify clients on rebuild
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openResponses.forEach((res) => res.write('data: reload\n\n'))
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openResponses.clear()
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}
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} else {
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console.error('Rebuild had errors...')
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}
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},
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},
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}
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}
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