cleanup: make PullRequest, ReleasePullRequest, Version fields readonly

src/plugins/cargo-workspace.ts

@@ -39,6 +39,7 @@ import {ReleasePullRequest} from '../release-pull-request';
 import {PullRequestTitle} from '../util/pull-request-title';
 import {PullRequestBody} from '../util/pull-request-body';
 import {BranchName} from '../util/branch-name';
+import {PatchVersionUpdate} from '../versioning-strategy';
 
 interface CrateInfo {
   /**
@@ -160,8 +161,7 @@ export class CargoWorkspace extends WorkspacePlugin<CrateInfo> {
 
   protected bumpVersion(pkg: CrateInfo): Version {
     const version = Version.parse(pkg.version);
-    version.patch += 1;
-    return version;
+    return new PatchVersionUpdate().bump(version);
   }
 
   protected updateCandidate(

src/plugins/node-workspace.ts

@@ -35,6 +35,7 @@ import {
   DependencyNode,
   WorkspacePluginOptions,
 } from './workspace';
+import {PatchVersionUpdate} from '../versioning-strategy';
 
 class Package extends LernaPackage {
   constructor(
@@ -143,8 +144,7 @@ export class NodeWorkspace extends WorkspacePlugin<Package> {
 
   protected bumpVersion(pkg: Package): Version {
     const version = Version.parse(pkg.version);
-    version.patch += 1;
-    return version;
+    return new PatchVersionUpdate().bump(version);
   }
 
   protected updateCandidate(

src/pull-request.ts

@@ -13,12 +13,12 @@
 // limitations under the License.
 
 export interface PullRequest {
-  headBranchName: string;
-  baseBranchName: string;
-  number: number;
-  title: string;
-  body: string;
-  labels: string[];
-  files: string[];
-  sha?: string;
+  readonly headBranchName: string;
+  readonly baseBranchName: string;
+  readonly number: number;
+  readonly title: string;
+  readonly body: string;
+  readonly labels: string[];
+  readonly files: string[];
+  readonly sha?: string;
 }

src/release-pull-request.ts

@@ -18,11 +18,11 @@ import {PullRequestBody} from './util/pull-request-body';
 import {PullRequestTitle} from './util/pull-request-title';
 
 export interface ReleasePullRequest {
-  title: PullRequestTitle;
-  body: PullRequestBody;
+  readonly title: PullRequestTitle;
+  readonly body: PullRequestBody;
+  readonly labels: string[];
+  readonly headRefName: string;
+  readonly version?: Version;
+  readonly draft: boolean;
   updates: Update[];
-  labels: string[];
-  headRefName: string;
-  version?: Version;
-  draft: boolean;
 }

src/version.ts

@@ -21,11 +21,11 @@ const VERSION_REGEX =
  * This data class is used to represent a SemVer version.
  */
 export class Version {
-  major: number;
-  minor: number;
-  patch: number;
-  preRelease?: string;
-  build?: string;
+  readonly major: number;
+  readonly minor: number;
+  readonly patch: number;
+  readonly preRelease?: string;
+  readonly build?: string;
 
   constructor(
     major: number,

src/versioning-strategies/java-add-snapshot.ts

@@ -35,10 +35,13 @@ class AddSnapshotVersionUpdate implements VersionUpdater {
   }
   bump(version: Version): Version {
     const nextPatch = this.strategy.bump(version, [fakeCommit]);
-    nextPatch.preRelease = nextPatch.preRelease
-      ? `${nextPatch.preRelease}-SNAPSHOT`
-      : 'SNAPSHOT';
-    return nextPatch;
+    return new Version(
+      nextPatch.major,
+      nextPatch.minor,
+      nextPatch.patch,
+      nextPatch.preRelease ? `${nextPatch.preRelease}-SNAPSHOT` : 'SNAPSHOT',
+      nextPatch.build
+    );
   }
 }