aaac7fed
 liuqimichale
add
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/* @flow */
/**
* Creates a mapper that maps components used during a server-side render
* to async chunk files in the client-side build, so that we can inline them
* directly in the rendered HTML to avoid waterfall requests.
*/
import type { ClientManifest } from './index'
export type AsyncFileMapper = (files: Array<string>) => Array<string>;
export function createMapper (
clientManifest: ClientManifest
): AsyncFileMapper {
const map = createMap(clientManifest)
// map server-side moduleIds to client-side files
return function mapper (moduleIds: Array<string>): Array<string> {
const res = new Set()
for (let i = 0; i < moduleIds.length; i++) {
const mapped = map.get(moduleIds[i])
if (mapped) {
for (let j = 0; j < mapped.length; j++) {
res.add(mapped[j])
}
}
}
return Array.from(res)
}
}
function createMap (clientManifest) {
const map = new Map()
Object.keys(clientManifest.modules).forEach(id => {
map.set(id, mapIdToFile(id, clientManifest))
})
return map
}
function mapIdToFile (id, clientManifest) {
const files = []
const fileIndices = clientManifest.modules[id]
if (fileIndices) {
fileIndices.forEach(index => {
const file = clientManifest.all[index]
// only include async files or non-js assets
if (clientManifest.async.indexOf(file) > -1 || !(/\.js($|\?)/.test(file))) {
files.push(file)
}
})
}
return files
}
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