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test: avoid Windows long-path failures in isolated Next.js installs #87197

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test: avoid Windows long-path failures in isolated Next.js installs #87197

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44c07fc
test: shorten isolated install dir names on Windows
Rezakarimzadeh98 Dec 15, 2025
40009ee
Merge branch 'canary' into pr-86418
Rezakarimzadeh98 Dec 16, 2025
8cd79d3
Merge branch 'canary' into pr-86418
Rezakarimzadeh98 Dec 17, 2025
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11 changes: 9 additions & 2 deletions test/lib/create-next-install.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,13 @@ const { linkPackages } =
const PREFER_OFFLINE = process.env.NEXT_TEST_PREFER_OFFLINE === '1'
const useRspack = process.env.NEXT_TEST_USE_RSPACK === '1'

function createTempId() {
// Windows path length limits can cause Turbopack to fail resolving packages
// from very deep pnpm virtual-store paths. Keep temp folder names short.
const bytes = process.platform === 'win32' ? 16 : 32
return randomBytes(bytes).toString('hex')
}

async function installDependencies(cwd, tmpDir) {
const args = [
'install',
Expand Down Expand Up @@ -62,7 +69,7 @@ async function createNextInstall({
const origRepoDir = path.join(__dirname, '../../')
const installDir = path.join(
tmpDir,
`next-install-${randomBytes(32).toString('hex')}`,
`next-install-${createTempId()}`,
subDir
)
let tmpRepoDir
Expand All @@ -78,7 +85,7 @@ async function createNextInstall({
} else {
tmpRepoDir = path.join(
tmpDir,
`next-repo-${randomBytes(32).toString('hex')}`,
`next-repo-${createTempId()}`,
subDir
)
require('console').log('Creating temp repo dir', tmpRepoDir)
Expand Down
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