const chunks = {} // chunkId => exports
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const chunksInstalling = {} // chunkId => Promise
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const failedChunks = {}
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function importChunk(chunkId, src) {
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// Already installed
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if (chunks[chunkId]) {
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return Promise.resolve(chunks[chunkId])
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}
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// Failed loading
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if (failedChunks[chunkId]) {
|
return Promise.reject(failedChunks[chunkId])
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}
|
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// Installing
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if (chunksInstalling[chunkId]) {
|
return chunksInstalling[chunkId]
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}
|
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// Set a promise in chunk cache
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let resolve, reject
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const promise = chunksInstalling[chunkId] = new Promise((_resolve, _reject) => {
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resolve = _resolve
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reject = _reject
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})
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// Clear chunk data from cache
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delete chunks[chunkId]
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// Start chunk loading
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const script = document.createElement('script')
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script.charset = 'utf-8'
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script.timeout = 120
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script.src = src
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let timeout
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// Create error before stack unwound to get useful stacktrace later
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const error = new Error()
|
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// Complete handlers
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const onScriptComplete = script.onerror = script.onload = (event) => {
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// Cleanups
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clearTimeout(timeout)
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delete chunksInstalling[chunkId]
|
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// Avoid mem leaks in IE
|
script.onerror = script.onload = null
|
|
// Verify chunk is loaded
|
if (chunks[chunkId]) {
|
return resolve(chunks[chunkId])
|
}
|
|
// Something bad happened
|
const errorType = event && (event.type === 'load' ? 'missing' : event.type)
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const realSrc = event && event.target && event.target.src
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error.message = 'Loading chunk ' + chunkId + ' failed.\n(' + errorType + ': ' + realSrc + ')'
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error.name = 'ChunkLoadError'
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error.type = errorType
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error.request = realSrc
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failedChunks[chunkId] = error
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reject(error)
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}
|
|
// Timeout
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timeout = setTimeout(() => {
|
onScriptComplete({ type: 'timeout', target: script })
|
}, 120000)
|
|
// Append script
|
document.head.appendChild(script)
|
|
// Return promise
|
return promise
|
}
|
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export function installJsonp() {
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window.__NUXT_JSONP__ = function (chunkId, exports) { chunks[chunkId] = exports }
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window.__NUXT_JSONP_CACHE__ = chunks
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window.__NUXT_IMPORT__ = importChunk
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}
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