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next.js/server/config.js

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import { join } from 'path'
import { existsSync } from 'fs'
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const cache = new Map()
const defaultConfig = {
webpack: null
}
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export default function getConfig (dir) {
if (!cache.has(dir)) {
cache.set(dir, loadConfig(dir))
}
return cache.get(dir)
}
function loadConfig (dir) {
const path = join(dir, 'next.config.js')
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let userConfig = {}
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const userHasConfig = existsSync(path)
if (userHasConfig) {
const userConfigModule = require(path)
userConfig = userConfigModule.default || userConfigModule
}
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return Object.assign({}, defaultConfig, userConfig)
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}