feat!: tag => prerelease and use semver (#20)

Author: wesleytodd

index.js

@@ -81,10 +81,9 @@ async function getLatestVersionsByCodename (now, cache, mirror) {
   const lts = {}
 
   const aliases = versions.reduce((obj, ver) => {
-    const { major, minor, patch, tag } = splitVersion(ver.version)
+    const { version, major, minor, patch, prerelease } = semver.parse(ver.version)
     const versionName = major !== '0' ? `v${major}` : `v${major}.${minor}`
     const codename = ver.lts ? ver.lts.toLowerCase() : versionName
-    const version = tag !== '' ? `${major}.${minor}.${patch}-${tag}` : `${major}.${minor}.${patch}`
     const s = schedule[versionName]
 
     // Version Object
@@ -93,7 +92,7 @@ async function getLatestVersionsByCodename (now, cache, mirror) {
       major,
       minor,
       patch,
-      tag,
+      prerelease,
       codename,
       versionName,
       start: s && s.start && new Date(s.start),
@@ -186,8 +185,3 @@ async function getLatestVersionsByCodename (now, cache, mirror) {
 
   return aliases
 }
-
-function splitVersion (ver) {
-  const [, major, minor, patch, tag] = /^v([0-9]*)\.([0-9]*)\.([0-9]*)(?:-([0-9A-Za-z-_]+))?/.exec(ver).map((n, i) => i < 4 ? parseInt(n, 10) : n || '')
-  return { major, minor, patch, tag }
-}

test/index.js

@@ -162,7 +162,7 @@ suite('nv', () => {
     assert.strictEqual(versions[0].major, 13)
     assert.strictEqual(versions[0].minor, 0)
     assert.strictEqual(versions[0].patch, 0)
-    assert.strictEqual(versions[0].tag, 'v8-canary20191022e5d3472f57')
+    assert.deepStrictEqual(versions[0].prerelease, ['v8-canary20191022e5d3472f57'])
     assert.strictEqual(versions[0].versionName, 'v13')
   })