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next.js/packages/next/build/babel/plugins/commonjs.ts

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import {PluginObj} from '@babel/core'
import {NodePath} from '@babel/traverse'
import {Program} from '@babel/types'
import commonjsPlugin from '@babel/plugin-transform-modules-commonjs'
// Rewrite imports using next/<something> to next-server/<something>
export default function NextToNextServer (...args: any): PluginObj {
const commonjs = commonjsPlugin(...args)
return {
visitor: {
Program: {
exit (path: NodePath<Program>, state) {
let foundModuleExports = false
path.traverse({
MemberExpression (
path: any
) {
if (path.node.object.name !== 'module') return
if (path.node.property.name !== 'exports') return
foundModuleExports = true
}
})
if (!foundModuleExports) {
return
}
commonjs.visitor.Program.exit.call(this, path, state)
}
}
}
}
}