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const { PHASE_PRODUCTION_BUILD } = require('next/constants')
const { findPagesDir } = require('next/dist/lib/find-pages-dir')
const loadConfig = require('next/dist/server/config').default
const getWebpackConfig = require('next/dist/build/webpack-config').default
const CWD = process.cwd()
async function webpackFinal(config) {
const nextConfig = await loadConfig(PHASE_PRODUCTION_BUILD, CWD)
const { pagesDir } = findPagesDir(CWD, !!nextConfig.experimental.appDir)
const nextWebpackConfig = await getWebpackConfig(CWD, {
pagesDir,
entrypoints: {},
isServer: false,
target: 'server',
config: nextConfig,
buildId: 'storybook',
rewrites: { beforeFiles: [], afterFiles: [], fallback: [] },
})
config.plugins = [...config.plugins, ...nextWebpackConfig.plugins]
config.resolve = {
...config.resolve,
...nextWebpackConfig.resolve,
}
config.module.rules = [
...filterModuleRules(config),
...nextWebpackConfig.module.rules.map((rule) => {
// we need to resolve next-babel-loader since it's not available
// relative with storybook's config
if (rule.use && rule.use.loader === 'next-babel-loader') {
rule.use.loader = require.resolve(
'next/dist/build/webpack/loaders/next-babel-loader'
)
}
return rule
}),
]
return config
}
function filterModuleRules(config) {
return config.module.rules.filter((rule) => {
// the rules we're filtering use RegExp for the test
if (!(rule.test instanceof RegExp)) return true
// use Next.js' built-in CSS
if (rule.test.test('hello.css')) {
return false
}
// use next-babel-loader instead of storybook's babel-loader
if (
rule.test.test('hello.js') &&
Array.isArray(rule.use) &&
rule.use[0].loader === 'babel-loader'
) {
return false
}
return true
})
}
module.exports = {
webpackFinal,
filterModuleRules,
}
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