have release-plan do a prerelease from main

.github/workflows/publish.yml

@@ -52,7 +52,7 @@ jobs:
       - uses: pnpm/action-setup@v4
       - run: pnpm install --frozen-lockfile
       - name: npm publish
-        run: pnpm release-plan publish
+        run: pnpm release-plan publish --tag=alpha
         env:
           GITHUB_AUTH: ${{ secrets.GITHUB_TOKEN }}
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

package.json

@@ -89,7 +89,7 @@
     "prettier": "^2.3.2",
     "qunit": "^2.16.0",
     "qunit-dom": "^1.6.0",
-    "release-plan": "^0.9.0"
+    "release-plan": "^0.10.0"
   },
   "peerDependencies": {
     "active-model-adapter": "*",
@@ -119,5 +119,17 @@
   },
   "ember-addon": {
     "configPath": "tests/dummy/config"
+  },
+  "release-plan": {
+    "semverIncrementAs": {
+      "major": "prerelease",
+      "minor": "prerelease",
+      "patch": "prerelease"
+    }
+  },
+  "pnpm": {
+    "patchedDependencies": {
+      "release-plan@0.10.0": "patches/release-plan@0.10.0.patch"
+    }
   }
 }

patches/release-plan@0.10.0.patch

@@ -0,0 +1,35 @@
+diff --git a/dist/plan.js b/dist/plan.js
+index 3e1641cb2cca0ec94e310b5b25bb98b78001c3cf..0e6de599b02eb66f7102d1d58802c298a9c9008a 100644
+--- a/dist/plan.js
++++ b/dist/plan.js
+@@ -39,7 +39,10 @@ class Plan {
+                 solution.set(pkgName, { impact: undefined, oldVersion: entry.version });
+             }
+             else {
+-                const newVersion = inc(entry.version, impact);
++              const newVersion = inc(
++                entry.version,
++                this.#configureImpact(pkgName, impact),
++              );
+                 solution.set(pkgName, {
+                     impact,
+                     oldVersion: entry.version,
+@@ -51,6 +54,18 @@ class Plan {
+         }
+         return solution;
+     }
++
++    #configureImpact(pkgName, impact) {
++      const packageJson = this.#pkgs.get(pkgName)?.pkg;
++      if (packageJson && packageJson['release-plan']?.semverIncrementAs) {
++        const semverOverrides = packageJson['release-plan'].semverIncrementAs;
++        if (semverOverrides[impact]) {
++          return semverOverrides[impact];
++        }
++      }
++      return impact;
++    }
++
+     #expandWorkspaceRange(range, availableVersion) {
+         // this implements PNPM's rules for how workspace: protocol dependencies get
+         // expanded into proper semver ranges.