ci(release): make npm/jsr publish idempotent

Author: rotu

.github/workflows/release.yml

@@ -49,7 +49,7 @@ jobs:
 
       - uses: denoland/setup-deno@v2
         with:
-          deno-version: lts
+          deno-version: v2.x
 
       - name: Resolve release version
         id: version
@@ -89,6 +89,36 @@ jobs:
           deno publish --dry-run --allow-dirty
           npm publish --provenance --dry-run
 
+      - if: env.RELEASE_PUBLISH == 'true'
+        name: Publish to npm and JSR (idempotent)
+        env:
+          RELEASE_VERSION: ${{ steps.version.outputs.version }}
+        run: |
+          set -euo pipefail
+
+          if npm view "@rotu/structview@${RELEASE_VERSION}" version >/dev/null 2>&1; then
+            echo "npm already has @rotu/structview@${RELEASE_VERSION}; skipping npm publish"
+          else
+            npm publish --provenance
+          fi
+
+          if deno eval --quiet 'const packageMeta = await fetch("https://jsr.io/@rotu/structview/meta.json").then((response) => response.json()); const versions = packageMeta?.versions ?? {}; Deno.exit(Object.hasOwn(versions, Deno.env.get("RELEASE_VERSION") ?? "") ? 0 : 1);'; then
+            echo "JSR already has @rotu/structview@${RELEASE_VERSION}; skipping JSR publish"
+          else
+            deno publish --allow-dirty
+          fi
+
+      - if: env.RELEASE_PUBLISH == 'true'
+        name: Verify published version parity
+        env:
+          RELEASE_VERSION: ${{ steps.version.outputs.version }}
+        run: |
+          set -euo pipefail
+
+          npm view "@rotu/structview@${RELEASE_VERSION}" version >/dev/null
+
+          deno eval --quiet 'const packageMeta = await fetch("https://jsr.io/@rotu/structview/meta.json").then((response) => response.json()); const versions = packageMeta?.versions ?? {}; if (!Object.hasOwn(versions, Deno.env.get("RELEASE_VERSION") ?? "")) { throw new Error(`JSR is missing version ${Deno.env.get("RELEASE_VERSION")}`); }'
+
       - if: env.RELEASE_PUBLISH == 'true'
         name: Commit and tag release
         shell: bash
@@ -113,10 +143,3 @@ jobs:
         env:
           GH_TOKEN: ${{ github.token }}
         run: gh release create "${{ steps.version.outputs.tag }}" --notes-file "$RUNNER_TEMP/release-notes.md"
-
-      - if: env.RELEASE_PUBLISH == 'true'
-        name: Publish to JSR and npm
-        run: |
-          set -euo pipefail
-          deno publish
-          npm publish --provenance