Added support for release pre

bin/release.js

@@ -351,24 +351,26 @@ const checkReleaseStatus = async () => {
 }
 
 const bumpType = args.sub
+const argAmount = bumpType.length
 
-if (bumpType.length === 1) {
-  const allowedTypes = []
+if (argAmount === 1 || (bumpType[0] === 'pre' && argAmount === 2)) {
+  const allowedTypes = ['pre']
 
   for (const type of changeTypes) {
     allowedTypes.push(type.handle)
   }
 
   const allowed = allowedTypes.includes(bumpType[0])
+  const type = bumpType[0]
 
   if (!allowed) {
     handleSpinner.fail(
-      'Version type not SemVer-compatible (major, minor or patch)!'
+      'Version type not SemVer-compatible ("major", "minor", "patch" or "pre")'
     )
     process.exit(1)
   }
 
-  bumpVersion(bumpType[0])
+  bumpVersion(type, bumpType[1])
 } else {
   checkReleaseStatus()
 }

lib/bump.js

@@ -32,7 +32,7 @@ const fail = message => {
   handleSpinner.fail(message)
 }
 
-module.exports = async type => {
+module.exports = async (type, preSuffix) => {
   if (isTTY) {
     handleSpinner.create('Bumping version tag')
   }
@@ -55,7 +55,14 @@ module.exports = async type => {
     fail(`No "version" field inside "package.json".`)
   }
 
-  const newVersion = semver.inc(pkgContent.version, type)
+  let newVersion
+
+  if (type === 'pre' && preSuffix) {
+    newVersion = semver.inc(pkgContent.version, type, preSuffix)
+  } else {
+    newVersion = semver.inc(pkgContent.version, type)
+  }
+
   pkgContent.version = newVersion
 
   try {

readme.md

@@ -30,6 +30,23 @@ To bump the version inside `package.json` or `package-lock.json`, run this comma
 release <major|minor|patch>
 ```
 
+### Pre-Releases
+
+Assuming that you want to increment a pre-release tag like `3.0.0-canary.1`, you can do it like this:
+
+```bash
+release pre
+```
+
+For the example tag mentioned above, the command will result in `3.0.0-canary.2`. However, you can also increment a normal tag like `3.0.0` to a pre-release one like this:
+
+```bash
+release pre <suffix>
+```
+
+If `<suffix>` is "canary", the example tag `3.0.0` would be incremented to `3.0.0-canary.0`. You can use any
+word of your choice in place of `<suffix>`.
+
 ### Options
 
 The following command will show you a list of all available options: