chore(resolve-version): export the alphaVersion (aws#16321)

This will be used by a change in `tools/individual-pkg-gen/copy-files-removing-deps.ts` on the `v2-main` branch, so that the `transform` step can correctly set the `version` key and the version for each dependency in each alpha module's `package.json` file.

See aws#16322 for usage. 

Part of aws#15591 

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

scripts/resolve-version-lib.js

@@ -37,7 +37,8 @@ function resolveVersion(rootdir) {
   // validate that current version matches the requirements
   //
 
-  const currentVersion = require(versionFilePath).version;
+  const versions = require(versionFilePath);
+  const currentVersion = versions.version;
   if (!currentVersion.startsWith(`${majorVersion}.`)) {
     throw new Error(`current version "${currentVersion}" does not use the expected major version ${majorVersion}`);
   }
@@ -68,6 +69,7 @@ function resolveVersion(rootdir) {
 
   return {
     version: currentVersion,
+    alphaVersion: versions.alphaVersion,
     versionFile,
     changelogFile,
     alphaChangelogFile,

scripts/script-tests/resolve-version.test.js

@@ -17,6 +17,24 @@ happy({
     marker: '0.0.0',
     prerelease: undefined,
     version: '2.1.0',
+    alphaVersion: undefined,
+    versionFile: 'version.v2.json'
+  }
+});
+
+happy({
+  name: 'stable release with alpha modules',
+  inputs: {
+    'release.json': { majorVersion: 2, releaseType: 'stable' },
+    'version.v2.json': { version: '2.1.0', alphaVersion: '2.1.0-alpha' },
+  },
+  expected: {
+    changelogFile: 'CHANGELOG.v2.md',
+    alphaChangelogFile: 'CHANGELOG.v2.alpha.md',
+    marker: '0.0.0',
+    prerelease: undefined,
+    version: '2.1.0',
+    alphaVersion: '2.1.0-alpha',
     versionFile: 'version.v2.json'
   }
 });
@@ -33,6 +51,7 @@ happy({
     marker: '0.0.0',
     prerelease: 'alpha',
     version: '2.1.0-alpha.0',
+    alphaVersion: undefined,
     versionFile: 'version.v2.json'
   }
 });
@@ -49,6 +68,24 @@ happy({
     marker: '0.0.0',
     prerelease: 'rc',
     version: '2.1.0-rc.0',
+    alphaVersion: undefined,
+    versionFile: 'version.v2.json'
+  }
+});
+
+happy({
+  name: 'rc release with alpha modules',
+  inputs: {
+    'release.json': { majorVersion: 2, releaseType: 'rc' },
+    'version.v2.json': { version: '2.0.0-rc.0', alphaVersion: '2.0.0-alpha.0' },
+  },
+  expected: {
+    changelogFile: 'CHANGELOG.v2.md',
+    alphaChangelogFile: 'CHANGELOG.v2.alpha.md',
+    marker: '0.0.0',
+    prerelease: 'rc',
+    version: '2.0.0-rc.0',
+    alphaVersion: '2.0.0-alpha.0',
     versionFile: 'version.v2.json'
   }
 });
@@ -65,6 +102,7 @@ happy({
     marker: '0.0.0',
     prerelease: undefined,
     version: '1.72.0',
+    alphaVersion: undefined,
     versionFile: 'version.v1.json'
   }
 });
@@ -81,6 +119,7 @@ happy({
     marker: '0.0.0',
     prerelease: undefined,
     version: '2.0.0-rc.0',
+    alphaVersion: undefined,
     versionFile: 'version.v2.json'
   }
 });