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next.js/server/build/plugins/watch-pages-plugin.js

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import { resolve, join } from 'path'
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export default class WatchPagesPlugin {
constructor (dir) {
this.dir = resolve(dir, 'pages')
}
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()
})
})
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compiler.plugin('emit', (compilation, callback) => {
// watch the pages directory
compilation.contextDependencies = [
...compilation.contextDependencies,
this.dir
]
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callback()
})
}
}