chore: workflow and script for pkg.pr.new

.github/workflows/preview-release.yml

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+name: Publish Preview Release
+on:
+  pull_request:
+
+jobs:
+  preview-release:
+    if: github.repository == 'sveltejs/cli'
+    timeout-minutes: 30
+    runs-on: ubuntu-latest
+    steps:
+      - name: checkout code repository
+        uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+
+      - name: setup node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+
+      - name: Run changed-files
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+        with:
+          separator: ' '
+          dir_names: 'true'
+          dir_names_max_depth: '2' # truncates the path to adders/X
+          files: |
+            packages/**
+
+      - name: install dependencies
+        run: pnpm install
+
+      - name: build
+        run: pnpm build
+
+      - name: publish preview
+        if: ${{ steps.changed-files.outputs.all_changed_files_count > 0 }}
+        env:
+          CHANGED_DIRS: ${{ steps.changed-files.outputs.all_changed_files }}
+        run: |
+          node scripts/get-deps-to-publish.js

scripts/get-deps-to-publish.js

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+/**
+ * This tool is used by the pr ci to determine the packages that need to be published to the pkg-pr-new registry.
+ * In order to avoid situations where only @svelte-cli/core would be published, because it's the only modified package,
+ * this tool will also determine the dependent packages and also publish those.
+ * PR: https://github.com/svelte-add/svelte-add/pull/408
+ */
+
+// @ts-check
+import { execSync } from 'node:child_process';
+import { relative, join } from 'node:path';
+import { existsSync } from 'node:fs';
+
+if (!process.env.CHANGED_DIRS) throw new Error('CHANGED_DIRS is missing');
+
+const json = execSync(`pnpm -r list --only-projects --json`).toString('utf8');
+const repoPackages =
+	/** @type {Array<import("../packages/core/utils/common.ts").Package & { path: string, private: boolean, peerDependencies?: Record<string, string> }>} */ (
+		JSON.parse(json)
+	);
+
+const modifiedDirs = process.env.CHANGED_DIRS.split(' ')
+	.map((dir) => (dir.startsWith('packages/adders') ? 'packages/adders' : dir))
+	.filter((dir) => existsSync(join(dir, 'package.json')));
+const packagesToPublish = new Set(modifiedDirs);
+
+// keep looping until we've acquired all dependents
+let prev = 0;
+while (packagesToPublish.size !== prev) {
+	prev = packagesToPublish.size;
+	for (const pkg of packagesToPublish) {
+		const dependents = getDependents(pkg);
+		dependents.forEach((dep) => packagesToPublish.add(dep));
+	}
+}
+
+// publishes packages to pkg-pr-new
+const paths = Array.from(packagesToPublish)
+	// remove all private packages
+	.filter((dir) => repoPackages.find((pkg) => pkg.path.endsWith(dir))?.private === false)
+	.join(' ');
+
+execSync(`pnpm dlx [email protected] publish --pnpm ${paths}`, { stdio: 'inherit' });
+
+/**
+ * Finds all dependents and returns their relative paths.
+ * @param {string} path
+ * @return {string[]}
+ */
+function getDependents(path) {
+	const pkg = repoPackages.find((pkg) => pkg.path.endsWith(path));
+	if (!pkg) throw new Error(`package ${path} doesn't exist in this repo`);
+
+	const dependents = repoPackages.filter(
+		(dep) =>
+			!dep.private &&
+			(dep.dependencies?.[pkg.name] ||
+				dep.devDependencies?.[pkg.name] ||
+				dep.peerDependencies?.[pkg.name]),
+	);
+	return dependents.map((dep) => relative('.', dep.path));
+}