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next.js/server/build/root-module-relative-path.js

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// Next.js needs to use module.resolve to generate paths to modules it includes,
// but those paths need to be relative to something so that they're portable
// across directories and machines.
//
// This function returns paths relative to the top-level 'node_modules'
// directory found in the path. If none is found, returns the complete path.
const RELATIVE_START = 'node_modules/'
// Pass in the module's `require` object since it's module-specific.
export default (moduleRequire) => (path) => {
// package.json removed because babel-runtime is resolved as
// "babel-runtime/package"
const absolutePath = moduleRequire.resolve(path)
.replace(/[\\/]package\.json$/, '')
const relativeStartIndex = absolutePath.indexOf(RELATIVE_START)
if (relativeStartIndex === -1) {
return absolutePath
}
return absolutePath.substring(relativeStartIndex + RELATIVE_START.length)
}