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next.js/server/build/plugins/watch-pages-plugin.js
Naoyuki Kanezawa 798fd3c1e8 Fix custom document compilation (#534)
* compile _document using webpack

* don't emit the bundle file of _document.js

* exclude _document.js from minChunks of CommonsChunkPlugin

* handle creation/removal of pages/_document.js

* improve path handlings
2016-12-27 15:28:19 -08:00

83 lines
2.2 KiB
JavaScript

import { resolve, relative, join, extname } from 'path'
const hotMiddlewareClientPath = join(__dirname, '..', '..', '..', 'client/webpack-hot-middleware-client')
const defaultPages = new Map()
for (const p of ['_error.js', '_document.js']) {
defaultPages.set(
join('bundles', 'pages', p),
join(__dirname, '..', '..', '..', 'pages', p)
)
}
export default class WatchPagesPlugin {
constructor (dir) {
this.dir = resolve(dir, 'pages')
this.prevFileDependencies = []
}
apply (compiler) {
compiler.plugin('compilation', (compilation) => {
compilation.plugin('optimize-assets', (assets, callback) => {
// transpile pages/_document.js and descendants,
// but don't need the bundle file
delete assets[join('bundles', 'pages', '_document.js')]
callback()
})
})
compiler.plugin('emit', (compilation, callback) => {
// watch the pages directory
compilation.contextDependencies =
compilation.contextDependencies.concat([this.dir])
this.prevFileDependencies = compilation.fileDependencies
callback()
})
const isPageFile = this.isPageFile.bind(this)
const getEntryName = (f) => {
return join('bundles', relative(compiler.options.context, f))
}
compiler.plugin('watch-run', (watching, callback) => {
Object.keys(compiler.fileTimestamps)
.filter(isPageFile)
.filter((f) => this.prevFileDependencies.indexOf(f) < 0)
.forEach((f) => {
const name = getEntryName(f)
if (defaultPages.has(name)) {
compiler.removeEntry(name)
}
if (compiler.hasEntry(name)) return
const entries = [hotMiddlewareClientPath, f]
compiler.addEntry(entries, name)
})
compiler.removedFiles
.filter(isPageFile)
.forEach((f) => {
const name = getEntryName(f)
compiler.removeEntry(name)
if (defaultPages.has(name)) {
compiler.addEntry([
hotMiddlewareClientPath,
defaultPages.get(name)
], name)
}
})
callback()
})
}
isPageFile (f) {
return f.indexOf(this.dir) === 0 && extname(f) === '.js'
}
}