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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,
webpackDevMiddleware: null,
poweredByHeader: true,
distDir: '.next',
assetPrefix: '',
configOrigin: 'default',
useFileSystemPublicRoutes: true
}
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export default function getConfig (dir, customConfig) {
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if (!cache.has(dir)) {
cache.set(dir, loadConfig(dir, customConfig))
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}
return cache.get(dir)
}
function loadConfig (dir, customConfig) {
if (customConfig && typeof customConfig === 'object') {
customConfig.configOrigin = 'server'
return withDefaults(customConfig)
}
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
userConfig.configOrigin = 'next.config.js'
}
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return withDefaults(userConfig)
}
function withDefaults (config) {
return Object.assign({}, defaultConfig, config)
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}