Semver Validation in Node.js

import { createClient } from '@isvalid-dev/sdk'

const iv = createClient({ apiKey: process.env.ISVALID_API_KEY! })

// Validate a single semver string
async function validateVersion(version: string) {
  const result = await iv.semver(version)
  if (!result.valid) throw new Error(`Invalid semver: ${version}`)
  return result
}

// Validate package.json version fields
async function validatePackageVersions(pkg: {
  version: string
  dependencies?: Record<string, string>
}) {
  const toValidate: [string, string][] = [['version', pkg.version]]

  // Validate exact dependency versions (skip ranges like ^1.0.0)
  if (pkg.dependencies) {
    for (const [name, ver] of Object.entries(pkg.dependencies)) {
      if (/^\d/.test(ver)) toValidate.push([name, ver])
    }
  }

  const results = await Promise.allSettled(
    toValidate.map(([, ver]) => iv.semver(ver))
  )

  const errors: Record<string, string> = {}
  toValidate.forEach(([name], i) => {
    const r = results[i]
    if (r.status === 'rejected' || (r.status === 'fulfilled' && !r.value.valid)) {
      errors[name] = `Invalid version: ${toValidate[i][1]}`
    }
  })

  return { valid: Object.keys(errors).length === 0, errors }
}

// Check if a release is stable (no pre-release tag)
async function isStableRelease(version: string) {
  const result = await iv.semver(version)
  if (!result.valid) return false
  return result.prerelease === null
}

// Examples
const v = await validateVersion('2.1.0-beta.1')
console.log(v.major)       // 2
console.log(v.minor)       // 1
console.log(v.patch)       // 0
console.log(v.prerelease)  // "beta.1"

const stable = await isStableRelease('1.0.0-rc.1')
console.log(stable)  // false