add --optional arg to gro publish and use it from gro release

.changeset/famous-rocks-travel.md

@@ -0,0 +1,5 @@
+---
+'@ryanatkn/gro': patch
+---
+
+add `--optional` arg to `gro publish` and use it from `gro release`

src/lib/publish.task.ts

@@ -39,6 +39,7 @@ export const Args = z
 					'opt out of linkifying and formatting the changelog from @changesets/changelog-git',
 			})
 			.default(false),
+		optional: z.boolean({description: 'exit gracefully if there are no changesets'}).default(false),
 		dry: z
 			.boolean({description: 'build and prepare to publish without actually publishing'})
 			.default(false),
@@ -58,7 +59,7 @@ export const task: Task<Args> = {
 	summary: 'bump version, publish to npm, and git push',
 	Args,
 	run: async ({args, log, invoke_task}): Promise<void> => {
-		const {branch, origin, changelog, preserve_changelog, dry, check, build, pull} = args;
+		const {branch, origin, changelog, preserve_changelog, dry, check, build, pull, optional} = args;
 		if (dry) {
 			log.info(green('dry run!'));
 		}
@@ -141,7 +142,13 @@ export const task: Task<Args> = {
 			const package_json_after = await load_package_json();
 			version = package_json_after.version!;
 			if (package_json_before.version === version) {
-				throw new Task_Error('changeset version failed: are there any changes?');
+				// The version didn't change.
+				// For now this is the best detection we have for a no-op `changeset version`.
+				if (optional) {
+					return; // exit gracefully
+				} else {
+					throw new Task_Error('changeset version failed: are there any changes?');
+				}
 			}
 		}
 

src/lib/release.task.ts

@@ -12,7 +12,7 @@ export const task: Task<Args> = {
 	run: async ({invoke_task}) => {
 		const publish = (await has_sveltekit_library()).ok;
 		if (publish) {
-			await invoke_task('publish');
+			await invoke_task('publish', {optional: true});
 		}
 		if ((await has_sveltekit_app()).ok) {
 			await invoke_task('deploy', {build: !publish});