1 files changed, 20 insertions, 8 deletions

diff --git a/node_modules/semver/classes/semver.js b/node_modules/semver/classes/semver.js
index 20eb089..25ee889 100644
--- a/node_modules/semver/classes/semver.js
+++ b/node_modules/semver/classes/semver.js
@@ -16,7 +16,7 @@ class SemVer {
         version = version.version
       }
     } else if (typeof version !== 'string') {
-      throw new TypeError(`Invalid Version: ${version}`)
+      throw new TypeError(`Invalid Version: ${require('util').inspect(version)}`)
     }
 
     if (version.length > MAX_LENGTH) {
@@ -246,9 +246,15 @@ class SemVer {
         break
       // This probably shouldn't be used publicly.
       // 1.0.0 'pre' would become 1.0.0-0 which is the wrong direction.
-      case 'pre':
+      case 'pre': {
+        const base = Number(identifierBase) ? 1 : 0
+
+        if (!identifier && identifierBase === false) {
+          throw new Error('invalid increment argument: identifier is empty')
+        }
+
         if (this.prerelease.length === 0) {
-          this.prerelease = [0]
+          this.prerelease = [base]
         } else {
           let i = this.prerelease.length
           while (--i >= 0) {
@@ -259,23 +265,29 @@ class SemVer {
           }
           if (i === -1) {
             // didn't increment anything
-            this.prerelease.push(0)
+            if (identifier === this.prerelease.join('.') && identifierBase === false) {
+              throw new Error('invalid increment argument: identifier already exists')
+            }
+            this.prerelease.push(base)
           }
         }
         if (identifier) {
-          const base = Number(identifierBase) ? 1 : 0
           // 1.2.0-beta.1 bumps to 1.2.0-beta.2,
           // 1.2.0-beta.fooblz or 1.2.0-beta bumps to 1.2.0-beta.0
+          let prerelease = [identifier, base]
+          if (identifierBase === false) {
+            prerelease = [identifier]
+          }
           if (compareIdentifiers(this.prerelease[0], identifier) === 0) {
             if (isNaN(this.prerelease[1])) {
-              this.prerelease = [identifier, base]
+              this.prerelease = prerelease
             }
           } else {
-            this.prerelease = [identifier, base]
+            this.prerelease = prerelease
           }
         }
         break
-
+      }
       default:
         throw new Error(`invalid increment argument: ${release}`)
     }