feat: add utils for PR-driven release

README.md

@@ -2,6 +2,43 @@
 
 This repo is used to share release & publish scripts for the org. Scripts should be executed from the workspace root via `tsx scripts/release.ts`
 
+## prepareRelease
+
+`prepareRelease` updates a package manifest without committing, tagging, or pushing. This is intended for release-PR workflows.
+
+```ts
+import { generateChangelog, prepareRelease } from "@vitejs/release-scripts";
+
+await prepareRelease({
+  pkg: "my-package",
+  release: process.env.RELEASE ?? "next",
+  generateChangelog: async (pkg) => {
+    await generateChangelog({
+      getPkgDir: () => `packages/${pkg}`,
+      tagPrefix: `${pkg}@`,
+    });
+  },
+});
+```
+
+`prepareRelease` returns the package, previous and next versions, and release tag. Pass `toTag`
+when a repository does not use the default `<package>@<version>` convention.
+
+## detectReleaseCommit
+
+```ts
+import { detectReleaseCommit } from "@vitejs/release-scripts";
+
+const release = detectReleaseCommit({
+  subject: "release: v1.2.3 (#42)",
+  packages: ["vite", "create-vite"],
+  defaultPackage: "vite",
+});
+```
+
+Use `extractChangelogEntry({ changelogPath, version })` to obtain the Markdown body for a
+GitHub release or release PR.
+
 ## release
 
 ```ts

src/changelog.ts

@@ -5,7 +5,10 @@ import createPreset, {
   DEFAULT_COMMIT_TYPES,
   formatCommitUrl,
 } from "conventional-changelog-conventionalcommits";
-import type { generateChangelog as def } from "./types.d.ts";
+import type {
+  extractChangelogEntry as extractChangelogEntryDef,
+  generateChangelog as generateChangelogDef,
+} from "./types.d.ts";
 import {
   heading,
   link,
@@ -38,7 +41,22 @@ interface ExtendedCommitNote extends CommitNote {
   };
 }
 
-export const generateChangelog: typeof def = async ({ getPkgDir, tagPrefix }) => {
+export const extractChangelogEntry: typeof extractChangelogEntryDef = ({
+  changelogPath,
+  version,
+}) => {
+  const sections = fs.readFileSync(changelogPath, "utf-8").split(/^## /m).slice(1);
+  const section = sections.find((candidate) => {
+    const heading = candidate.split("\n", 1)[0];
+    return heading.includes(`[${version}](`) || heading.startsWith(`${version} (`);
+  });
+  if (!section) throw new Error(`Missing changelog entry for ${version}`);
+
+  const entry = section.split("\n").slice(1).join("\n").trim();
+  return entry;
+};
+
+export const generateChangelog: typeof generateChangelogDef = async ({ getPkgDir, tagPrefix }) => {
   const preset: Preset = createPreset({
     types: DEFAULT_COMMIT_TYPES.map((t) => ({
       ...t,

src/detectRelease.ts

@@ -0,0 +1,42 @@
+import fs from "node:fs";
+import path from "node:path";
+import type {
+  detectReleaseCommit as detectReleaseCommitDef,
+  getReleaseTag as getReleaseTagDef,
+  isReleaseCommitSubject as isReleaseCommitSubjectDef,
+} from "./types.d.ts";
+
+export const getReleaseTag: typeof getReleaseTagDef = (pkg, version, defaultPackage) => {
+  return pkg === defaultPackage ? `v${version}` : `${pkg}@${version}`;
+};
+
+export const isReleaseCommitSubject: typeof isReleaseCommitSubjectDef = (subject, tag) => {
+  const expected = `release: ${tag}`;
+  return (
+    subject === expected ||
+    (subject.startsWith(expected) && /^ \(#\d+\)$/.test(subject.slice(expected.length)))
+  );
+};
+
+export const detectReleaseCommit: typeof detectReleaseCommitDef = ({
+  subject,
+  packages,
+  defaultPackage,
+  getPkgDir = (pkg) => `packages/${pkg}`,
+  toTag = (pkg, version) => getReleaseTag(pkg, version, defaultPackage),
+}) => {
+  for (const pkg of packages) {
+    const pkgPath = path.resolve(getPkgDir(pkg), "package.json");
+    const packageJson = JSON.parse(fs.readFileSync(pkgPath, "utf-8")) as {
+      version?: unknown;
+    };
+    if (typeof packageJson.version !== "string") {
+      throw new Error(`Package ${JSON.stringify(pkg)} does not have a valid version`);
+    }
+
+    const version = packageJson.version;
+    const tag = toTag(pkg, version);
+    if (isReleaseCommitSubject(subject, tag)) return { pkg, version, tag };
+  }
+  return undefined;
+};

src/index.ts

@@ -1,3 +1,5 @@
-export { publish } from "./publish.ts";
+export { getPublishTag, publish, validatePublishVersion } from "./publish.ts";
 export { release } from "./release.ts";
-export { generateChangelog } from "./changelog.ts";
+export { extractChangelogEntry, generateChangelog } from "./changelog.ts";
+export { detectReleaseCommit, getReleaseTag, isReleaseCommitSubject } from "./detectRelease.ts";
+export { prepareRelease } from "./prepare.ts";

src/prepare.ts

@@ -0,0 +1,64 @@
+import fs from "node:fs";
+import path from "node:path";
+import semver from "semver";
+import type { ReleaseType } from "semver";
+import { getReleaseTag } from "./detectRelease.ts";
+import { validatePublishVersion } from "./publish.ts";
+import type { prepareRelease as prepareReleaseDef } from "./types.d.ts";
+import { updateVersion } from "./utils.ts";
+
+function resolveVersion(currentVersion: string, release: string, preid: string): string {
+  if (semver.valid(release)) return release;
+
+  const releaseType =
+    release === "next" ? (semver.prerelease(currentVersion) ? "prerelease" : "patch") : release;
+  if (!semver.RELEASE_TYPES.includes(releaseType as ReleaseType)) {
+    throw new Error(`Invalid Version: ${release}`);
+  }
+
+  let version = semver.inc(currentVersion, releaseType as ReleaseType, preid);
+  if (!version) throw new Error(`Invalid Version: ${release}`);
+
+  const prerelease = semver.prerelease(version);
+  if (releaseType.startsWith("pre") && prerelease?.[0] === preid && prerelease[1] === 0) {
+    version = semver.inc(version, "prerelease", preid)!;
+  }
+  return version;
+}
+
+export const prepareRelease: typeof prepareReleaseDef = async ({
+  packages,
+  pkg,
+  release,
+  preid,
+  getPkgDir = (pkgName) => `packages/${pkgName}`,
+  toTag = (pkgName, version) => getReleaseTag(pkgName, version),
+  generateChangelog,
+}) => {
+  if (!pkg || (packages && !packages.includes(pkg))) {
+    const expected = packages?.length ? ` Expected one of: ${packages.join(", ")}` : "";
+    throw new Error(`Invalid release package ${JSON.stringify(pkg)}.${expected}`);
+  }
+
+  const pkgDir = path.resolve(getPkgDir(pkg));
+  const pkgPath = path.join(pkgDir, "package.json");
+  if (semver.valid(release)) validatePublishVersion(release);
+  const packageJson = JSON.parse(fs.readFileSync(pkgPath, "utf-8")) as {
+    version?: unknown;
+  };
+  if (typeof packageJson.version !== "string") {
+    throw new Error(`Package ${JSON.stringify(pkg)} does not have a valid version`);
+  }
+  const currentPrerelease = semver.prerelease(packageJson.version);
+  const currentPreid =
+    typeof currentPrerelease?.[0] === "string" ? currentPrerelease[0] : undefined;
+
+  const previousVersion = packageJson.version;
+  const version = resolveVersion(previousVersion, release, preid ?? currentPreid ?? "beta");
+  validatePublishVersion(version);
+  updateVersion(pkgPath, version);
+
+  await generateChangelog?.(pkg, version);
+
+  return { pkg, previousVersion, version, tag: toTag(pkg, version) };
+};

src/publish.ts

@@ -1,8 +1,37 @@
 import * as semver from "semver";
 import { args, getActiveVersion, getPackageInfo, publishPackage, step } from "./utils.ts";
-import type { publish as def } from "./types.d.ts";
+import type {
+  getPublishTag as getPublishTagDef,
+  publish as publishDef,
+  validatePublishVersion as validatePublishVersionDef,
+} from "./types.d.ts";
 
-export const publish: typeof def = async ({
+export const validatePublishVersion: typeof validatePublishVersionDef = (version) => {
+  const parsed = semver.parse(version);
+  if (!parsed) {
+    throw new Error(`Invalid publish version ${JSON.stringify(version)}`);
+  }
+
+  const prereleaseIdentifier = parsed.prerelease[0];
+  if (
+    prereleaseIdentifier !== undefined &&
+    prereleaseIdentifier !== "alpha" &&
+    prereleaseIdentifier !== "beta"
+  ) {
+    throw new Error(`Only alpha and beta prereleases are supported, received ${version}`);
+  }
+};
+
+export const getPublishTag: typeof getPublishTagDef = (version, activeVersion) => {
+  validatePublishVersion(version);
+  const prereleaseIdentifier = semver.prerelease(version)?.[0];
+  if (prereleaseIdentifier === "alpha" || prereleaseIdentifier === "beta") {
+    return prereleaseIdentifier;
+  }
+  return activeVersion && semver.lt(version, activeVersion) ? "previous" : undefined;
+};
+
+export const publish: typeof publishDef = async ({
   defaultPackage,
   getPkgDir,
   provenance,
@@ -29,16 +58,11 @@ export const publish: typeof def = async ({
     throw new Error(
       `Package version from tag "${version}" mismatches with current version "${pkg.version}"`,
     );
+  validatePublishVersion(version);
 
   const activeVersion = await getActiveVersion(pkg.name);
 
   step("Publishing package...");
-  const releaseTag = version.includes("beta")
-    ? "beta"
-    : version.includes("alpha")
-      ? "alpha"
-      : activeVersion && semver.lt(pkg.version, activeVersion)
-        ? "previous"
-        : undefined;
+  const releaseTag = getPublishTag(version, activeVersion);
   await publishPackage(pkgDir, releaseTag, provenance, packageManager);
 };

src/types.d.ts

@@ -5,6 +5,46 @@ export declare function generateChangelog(options: {
   tagPrefix?: string;
 }): Promise<void>;
 
+export declare function extractChangelogEntry(options: {
+  changelogPath: string;
+  version: string;
+}): string;
+
+export declare function getReleaseTag(
+  pkg: string,
+  version: string,
+  defaultPackage?: string,
+): string;
+
+export declare function isReleaseCommitSubject(subject: string, tag: string): boolean;
+
+export declare function detectReleaseCommit(options: {
+  subject: string;
+  packages: readonly string[];
+  defaultPackage?: string;
+  /** @default (pkg) => `packages/${pkg}` */
+  getPkgDir?: (pkg: string) => string;
+  toTag?: (pkg: string, version: string) => string;
+}): { pkg: string; version: string; tag: string } | undefined;
+
+export declare function prepareRelease(options: {
+  /** Restricts the accepted package names when provided. */
+  packages?: readonly string[];
+  pkg: string | undefined;
+  release: string;
+  /** @default current prerelease identifier, otherwise "beta" */
+  preid?: string;
+  /** @default (pkg) => `packages/${pkg}` */
+  getPkgDir?: (pkg: string) => string;
+  /** @default (pkg, version) => `${pkg}@${version}` */
+  toTag?: (pkg: string, version: string) => string;
+  generateChangelog?: (pkg: string, version: string) => void | Promise<void>;
+}): Promise<{ pkg: string; previousVersion: string; version: string; tag: string }>;
+
+export declare function validatePublishVersion(version: string): void;
+
+export declare function getPublishTag(version: string, activeVersion?: string): string | undefined;
+
 export declare function publish(options: {
   defaultPackage?: string;
   getPkgDir?: (pkg: string) => string;

tests/__snapshots__/changelog.test.ts.snap

@@ -1,6 +1,6 @@
 // Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
 
-exports[`generates a changelog with breaking changes 1`] = `
+exports[`generateChangelog > generates a changelog with breaking changes 1`] = `
 "## [2.0.0](https://github.com/vitejs/test/compare/v1.0.0...v2.0.0) (yyyy-mm-dd)
 ### ⚠ BREAKING CHANGES
 
@@ -22,7 +22,7 @@ exports[`generates a changelog with breaking changes 1`] = `
 "
 `;
 
-exports[`generates a changelog with commits 1`] = `
+exports[`generateChangelog > generates a changelog with commits 1`] = `
 "## <small>[1.0.1](https://github.com/vitejs/test/compare/v1.0.0...v1.0.1) (yyyy-mm-dd)</small>
 ### Bug Fixes
 
@@ -36,7 +36,7 @@ exports[`generates a changelog with commits 1`] = `
 "
 `;
 
-exports[`generates a changelog with commits 2`] = `
+exports[`generateChangelog > generates a changelog with commits 2`] = `
 "## [1.1.0](https://github.com/vitejs/test/compare/v1.0.1...v1.1.0) (yyyy-mm-dd)
 ### Features
 
@@ -55,7 +55,7 @@ exports[`generates a changelog with commits 2`] = `
 "
 `;
 
-exports[`generates a new changelog for empty project 1`] = `
+exports[`generateChangelog > generates a new changelog for empty project 1`] = `
 "## 1.0.0 (yyyy-mm-dd)
 ### Miscellaneous Chores