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next.js/server/resolve.js

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import { join, sep } from 'path'
import fs from 'mz/fs'
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export default async function resolve (id) {
const paths = getPaths(id)
for (const p of paths) {
if (await isFile(p)) {
return p
}
}
const err = new Error(`Cannot find module ${id}`)
err.code = 'ENOENT'
throw err
}
export function resolveFromList (id, files) {
const paths = getPaths(id)
const set = new Set(files)
for (const p of paths) {
if (set.has(p)) return p
}
}
function getPaths (id) {
const i = sep === '/' ? id : id.replace(/\//g, sep)
if (i.slice(-3) === '.js') return [i]
if (i[i.length - 1] === sep) return [i + 'index.js']
return [
i + '.js',
join(i, 'index.js')
]
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}
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async function isFile (p) {
let stat
try {
stat = await fs.stat(p)
} catch (err) {
if (err.code === 'ENOENT') return false
throw err
}
return stat.isFile() || stat.isFIFO()
}