forked from vercel/next.js
/
dev-build-watcher.js
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/
dev-build-watcher.js
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import { getEventSourceWrapper } from './error-overlay/eventsource'
export default function initializeBuildWatcher(toggleCallback) {
const shadowHost = document.createElement('div')
shadowHost.id = '__next-build-watcher'
// Make sure container is fixed and on a high zIndex so it shows
shadowHost.style.position = 'fixed'
shadowHost.style.bottom = '10px'
shadowHost.style.right = '20px'
shadowHost.style.width = 0
shadowHost.style.height = 0
shadowHost.style.zIndex = 99999
document.body.appendChild(shadowHost)
let shadowRoot
let prefix = ''
if (shadowHost.attachShadow) {
shadowRoot = shadowHost.attachShadow({ mode: 'open' })
} else {
// If attachShadow is undefined then the browser does not support
// the Shadow DOM, we need to prefix all the names so there
// will be no conflicts
shadowRoot = shadowHost
prefix = '__next-build-watcher-'
}
// Container
const container = createContainer(prefix)
shadowRoot.appendChild(container)
// CSS
const css = createCss(prefix)
shadowRoot.appendChild(css)
// State
let isVisible = false
let isBuilding = false
let timeoutId = null
// Handle events
const evtSource = getEventSourceWrapper({ path: '/_next/webpack-hmr' })
evtSource.addMessageListener((event) => {
// This is the heartbeat event
if (event.data === '\uD83D\uDC93') {
return
}
try {
handleMessage(event)
} catch {}
})
function handleMessage(event) {
const obj =
typeof event === 'string' ? { action: event } : JSON.parse(event.data)
// eslint-disable-next-line default-case
switch (obj.action) {
case 'building':
timeoutId && clearTimeout(timeoutId)
isVisible = true
isBuilding = true
updateContainer()
break
case 'built':
case 'sync':
isBuilding = false
// Wait for the fade out transtion to complete
timeoutId = setTimeout(() => {
isVisible = false
updateContainer()
}, 100)
updateContainer()
break
}
}
toggleCallback(handleMessage)
function updateContainer() {
if (isBuilding) {
container.classList.add(`${prefix}building`)
} else {
container.classList.remove(`${prefix}building`)
}
if (isVisible) {
container.classList.add(`${prefix}visible`)
} else {
container.classList.remove(`${prefix}visible`)
}
}
}
function createContainer(prefix) {
const container = document.createElement('div')
container.id = `${prefix}container`
container.innerHTML = `
<div id="${prefix}icon-wrapper">
<svg viewBox="0 0 226 200">
<defs>
<linearGradient
x1="114.720775%"
y1="181.283245%"
x2="39.5399306%"
y2="100%"
id="${prefix}linear-gradient"
>
<stop stop-color="#000000" offset="0%" />
<stop stop-color="#FFFFFF" offset="100%" />
</linearGradient>
</defs>
<g id="${prefix}icon-group" fill="none" stroke="url(#${prefix}linear-gradient)" stroke-width="18">
<path d="M113,5.08219117 L4.28393801,197.5 L221.716062,197.5 L113,5.08219117 Z" />
</g>
</svg>
</div>
`
return container
}
function createCss(prefix) {
const css = document.createElement('style')
css.textContent = `
#${prefix}container {
position: absolute;
bottom: 10px;
right: 30px;
border-radius: 3px;
background: #000;
color: #fff;
font: initial;
cursor: initial;
letter-spacing: initial;
text-shadow: initial;
text-transform: initial;
visibility: initial;
padding: 7px 10px 8px 10px;
align-items: center;
box-shadow: 0 11px 40px 0 rgba(0, 0, 0, 0.25), 0 2px 10px 0 rgba(0, 0, 0, 0.12);
display: none;
opacity: 0;
transition: opacity 0.1s ease, bottom 0.1s ease;
animation: ${prefix}fade-in 0.1s ease-in-out;
}
#${prefix}container.${prefix}visible {
display: flex;
}
#${prefix}container.${prefix}building {
bottom: 20px;
opacity: 1;
}
#${prefix}icon-wrapper {
width: 16px;
height: 16px;
}
#${prefix}icon-wrapper > svg {
width: 100%;
height: 100%;
}
#${prefix}icon-group {
animation: ${prefix}strokedash 1s ease-in-out both infinite;
}
@keyframes ${prefix}fade-in {
from {
bottom: 10px;
opacity: 0;
}
to {
bottom: 20px;
opacity: 1;
}
}
@keyframes ${prefix}strokedash {
0% {
stroke-dasharray: 0 226;
}
80%,
100% {
stroke-dasharray: 659 226;
}
}
`
return css
}