Function extractZip

scripts/postinstall.cjs:211–281

(buffer, binaryPath, extractedBinary)

}

async function extractZip(buffer, binaryPath, extractedBinary) {
  const binaryDir = path.dirname(binaryPath)
  // Try fflate first (bundled dep)
  let fflateError
  try {
    const { unzipSync } = require('fflate')
    const unzipped = unzipSync(new Uint8Array(buffer))
    const key = findZipEntryKey(unzipped, extractedBinary)
    if (!key) {
      throw new Error(`Binary ${extractedBinary} not found in zip`)
    }
    writeFileSync(binaryPath, Buffer.from(unzipped[key]))
    return
  } catch (e) {
    fflateError = e
  }

  // Fallback: PowerShell Expand-Archive or unzip CLI
  const tmpDir = path.join(binaryDir, '.tmp-download')
  rmSync(tmpDir, { recursive: true, force: true })
  mkdirSync(tmpDir, { recursive: true })
  try {
    const assetName = `archive.zip`
    const archivePath = path.join(tmpDir, assetName)
    writeFileSync(archivePath, buffer)

    let extracted = false
    if (process.platform === 'win32') {
      const psCmd = `Expand-Archive -Path '${archivePath.replace(/'/g, "''")}' -DestinationPath '${tmpDir.replace(/'/g, "''")}' -Force`
      const psResult = spawnSync(
        'powershell.exe',
        [
          '-NoProfile',
          '-NonInteractive',
          '-ExecutionPolicy',
          'Bypass',
          '-Command',
          psCmd,
        ],
        { stdio: 'pipe', windowsHide: true },
      )
      if (psResult.status === 0) {
        extracted = true
      }
    }

    if (!extracted) {
      const result = spawnSync('unzip', ['-o', archivePath, '-d', tmpDir], {
        stdio: 'pipe',
      })
      if (result.status !== 0) {
        const unzipErr = result.stderr?.toString().trim() || 'command not found'
        const fflateMsg =
          fflateError instanceof Error
            ? fflateError.message
            : String(fflateError)
        throw new Error(
          `zip extraction failed (fflate: ${fflateMsg}; unzip: ${unzipErr})`,