Add isPrerelease to output.

Author: freezy

README.md

@@ -25,13 +25,15 @@ This action was inspired by [latest-tag](https://github.com/EndBug/latest-tag) a
 
 You should use this action in a workflow immediately after checkout. The following outputs will be set:
 
-- `version`: version from package.json
-- `tags`: reverse sorted git tags in semver format
-- `nextVersion`: calculated next version (see table above)
+- `version` - version from package.json
+- `tags` - reverse sorted git tags in semver format
+- `nextVersion` - calculated next version (see table above)
+- `nextTag` - calculated next version, prefixed (see below)
+- `isPrerelease` - true if pre-release, false otherwise.
 
 For inputs, the following options are available:
 
-- `versionPrefix`: adds a string to the tag.
+- `tagPrefix` - adds a string to the `nextTag` (default: '').
 
 Example yml:
 

src/main.ts

@@ -91,8 +91,10 @@ async function run(): Promise<void> {
     console.log(`tags: ${tags}`);
 
     const nextVersion = getNextVersion(version, tags);
-    const prefix = core.getInput('versionPrefix') || '';
-    core.setOutput('nextVersion', prefix + nextVersion);
+    const tagPrefix = core.getInput('tagPrefix') || '';
+    core.setOutput('nextVersion', nextVersion);
+    core.setOutput('nextTag', tagPrefix + nextVersion);
+    core.setOutput('isPrerelease', isPreRelease(new SemVer(nextVersion)));
     console.log(`nextVersion: ${nextVersion}`);
   } catch (error) {
     core.setFailed(error.message);