feat: add Dart pubspec.yaml updater with support for prerelease and build numbers

src/updaters/dart/pubspec-yaml.ts

@@ -26,7 +26,7 @@ export class PubspecYaml extends DefaultUpdater {
    */
 
   updateContent(content: string, logger: Logger = defaultLogger): string {
-    const oldVersion = content.match(/^version: ([0-9.]+)\+?(.*$)/m);
+    const oldVersion = content.match(/^version: ([0-9]+\.[0-9]+\.[0-9]+(?:-[^\s+]+)?)\+?(.*$)/m);
     let buildNumber = '';
 
     if (oldVersion) {

test/updaters/fixtures/pubspec_prerelease.yaml

@@ -0,0 +1,8 @@
+name: hello_world
+description: Hello World
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+version: 0.5.0-beta.1
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'

test/updaters/fixtures/pubspec_prerelease_with_build_no.yaml

@@ -0,0 +1,8 @@
+name: hello_world
+description: Hello World
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+version: 0.5.0-beta.1+5
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'

test/updaters/pubspec-yaml.ts

@@ -58,5 +58,28 @@ describe('PubspecYaml', () => {
       const newContent = version.updateContent(oldContent);
       snapshot(newContent);
     });
+    it('updates prerelease version in pubspec.yaml file', async () => {
+      const oldContent = readFileSync(
+        resolve(fixturesPath, './pubspec_prerelease.yaml'),
+        'utf8'
+      ).replace(/\r\n/g, '\n'); // required for windows
+      const version = new PubspecYaml({
+        version: Version.parse('0.6.0'),
+      });
+      const newContent = version.updateContent(oldContent);
+      snapshot(newContent);
+    });
+
+    it('updates prerelease version with build number in pubspec.yaml file', async () => {
+      const oldContent = readFileSync(
+        resolve(fixturesPath, './pubspec_prerelease_with_build_no.yaml'),
+        'utf8'
+      ).replace(/\r\n/g, '\n'); // required for windows
+      const version = new PubspecYaml({
+        version: Version.parse('0.6.0'),
+      });
+      const newContent = version.updateContent(oldContent);
+      snapshot(newContent);
+    });
   });
 });