[wrangler] Add pull request title to preview deployment annotations

.changeset/preview-pull-request-title.md

@@ -0,0 +1,10 @@
+---
+"@cloudflare/deploy-helpers": minor
+"wrangler": minor
+---
+
+Add pull request title to `wrangler preview` deployment annotations
+
+`wrangler preview` now also detects the title of the pull/merge request associated with the current CI run (GitHub Actions and GitLab CI, plus a generic `PULL_REQUEST_TITLE` fallback) and attaches it to the preview deployment as the `workers/pull_request_title` annotation, alongside the existing pull request number/URL, repository URL, and commit SHA annotations.
+
+This is best effort: if no pull request title can be detected, nothing changes.

packages/deploy-helpers/src/preview/api.ts

@@ -83,6 +83,7 @@ export interface DeploymentResource {
 		"workers/commit_sha"?: string;
 		"workers/message"?: string;
 		"workers/pull_request_number"?: string;
+		"workers/pull_request_title"?: string;
 		"workers/pull_request_url"?: string;
 		"workers/repository_url"?: string;
 		"workers/tag"?: string;
@@ -112,6 +113,7 @@ export type CreatePreviewDeploymentRequestParams = {
 		"workers/commit_sha"?: string;
 		"workers/message"?: string;
 		"workers/pull_request_number"?: string;
+		"workers/pull_request_title"?: string;
 		"workers/pull_request_url"?: string;
 		"workers/repository_url"?: string;
 		"workers/tag"?: string;

packages/deploy-helpers/src/preview/preview.ts

@@ -463,6 +463,9 @@ async function assemblePreviewDeploymentSettings(
 			...(pullRequest?.number && {
 				"workers/pull_request_number": pullRequest.number,
 			}),
+			...(pullRequest?.title && {
+				"workers/pull_request_title": pullRequest.title,
+			}),
 			...(pullRequest?.url && { "workers/pull_request_url": pullRequest.url }),
 			...(repositoryUrl && { "workers/repository_url": repositoryUrl }),
 			...(options.tag && { "workers/tag": options.tag }),

packages/deploy-helpers/src/preview/shared.ts

@@ -174,13 +174,14 @@ export function getRepositoryUrl(): string | undefined {
 }
 
 /**
- * The pull/merge request number and URL detected from the current CI
- * environment. Either field may be missing depending on what the detected
- * CI provider exposes.
+ * The pull/merge request number, URL, and title detected from the current CI
+ * environment. Any field may be missing depending on what the detected CI
+ * provider exposes.
  */
 export type PullRequestMetadata = {
 	number?: string;
 	url?: string;
+	title?: string;
 };
 
 /**
@@ -197,30 +198,51 @@ function normalizePullRequestNumber(number: string | number | undefined) {
 	return normalizedNumber ? normalizedNumber : undefined;
 }
 
+/**
+ * Trims a pull/merge request title, treating a blank value the same as a
+ * missing one.
+ */
+function normalizePullRequestTitle(
+	title: string | undefined
+): string | undefined {
+	if (title === undefined) {
+		return undefined;
+	}
+
+	const trimmedTitle = title.trim();
+	return trimmedTitle ? trimmedTitle : undefined;
+}
+
 /**
  * Detects pull request metadata from a GitHub Actions environment.
  *
  * Prefers the `pull_request` event payload at `GITHUB_EVENT_PATH` (available
  * for `pull_request`/`pull_request_target`-triggered workflows), which
- * directly provides the PR number and URL. Falls back to parsing the PR
- * number out of `GITHUB_REF` (formatted `refs/pull/<number>/merge`) and
+ * directly provides the PR number, URL, and title. Falls back to parsing the
+ * PR number out of `GITHUB_REF` (formatted `refs/pull/<number>/merge`) and
  * building the URL from `GITHUB_REPOSITORY`/`GITHUB_SERVER_URL`, which covers
- * other trigger types where a `pull_request` payload isn't available.
+ * other trigger types where a `pull_request` payload isn't available — this
+ * fallback path can't recover a title, since that isn't encoded in the ref.
  */
 function getGitHubPullRequestMetadata(): PullRequestMetadata | undefined {
 	if (process.env.GITHUB_EVENT_PATH) {
 		try {
 			const event = JSON.parse(
 				readFileSync(process.env.GITHUB_EVENT_PATH, "utf8")
 			) as {
-				pull_request?: { html_url?: string; number?: number };
+				pull_request?: {
+					html_url?: string;
+					number?: number;
+					title?: string;
+				};
 			};
 			const number = normalizePullRequestNumber(event.pull_request?.number);
 			const url = event.pull_request?.html_url
 				? normalizeRepositoryUrl(event.pull_request.html_url)
 				: undefined;
-			if (number || url) {
-				return { number, url };
+			const title = normalizePullRequestTitle(event.pull_request?.title);
+			if (number || url || title) {
+				return { number, url, title };
 			}
 		} catch {
 			// Fall back to environment-derived metadata below.
@@ -245,9 +267,9 @@ function getGitHubPullRequestMetadata(): PullRequestMetadata | undefined {
 
 /**
  * Detects merge request metadata from a GitLab CI merge request pipeline,
- * using `CI_MERGE_REQUEST_IID` for the number and
+ * using `CI_MERGE_REQUEST_IID` for the number,
  * `CI_MERGE_REQUEST_PROJECT_URL` (or `CI_PROJECT_URL` as a fallback) to build
- * the merge request URL.
+ * the merge request URL, and `CI_MERGE_REQUEST_TITLE` for the title.
  */
 function getGitLabPullRequestMetadata(): PullRequestMetadata | undefined {
 	const number = normalizePullRequestNumber(process.env.CI_MERGE_REQUEST_IID);
@@ -265,16 +287,18 @@ function getGitLabPullRequestMetadata(): PullRequestMetadata | undefined {
 		url: normalizeRepositoryUrl(
 			`${normalizedProjectUrl}/-/merge_requests/${number}`
 		),
+		title: normalizePullRequestTitle(process.env.CI_MERGE_REQUEST_TITLE),
 	};
 }
 
 /**
  * Detects pull request metadata from generic, provider-agnostic env vars
  * (`PULL_REQUEST_URL`/`PR_URL`/`CHANGE_URL`/`CIRCLE_PULL_REQUEST` for the URL,
- * `PULL_REQUEST_NUMBER`/`PR_NUMBER`/`CHANGE_ID` for the number). These are
- * conventions used by some CI providers and custom pipelines, but aren't
- * officially documented, so this is a lower-confidence, best-effort fallback
- * checked before the provider-specific detectors.
+ * `PULL_REQUEST_NUMBER`/`PR_NUMBER`/`CHANGE_ID` for the number,
+ * `PULL_REQUEST_TITLE` for the title). These are conventions used by some CI
+ * providers and custom pipelines, but aren't officially documented, so this
+ * is a lower-confidence, best-effort fallback checked before the
+ * provider-specific detectors.
  */
 function getDirectPullRequestMetadata(): PullRequestMetadata | undefined {
 	const directUrl =
@@ -288,9 +312,10 @@ function getDirectPullRequestMetadata(): PullRequestMetadata | undefined {
 			process.env.CHANGE_ID
 	);
 	const url = directUrl ? normalizeRepositoryUrl(directUrl) : undefined;
+	const title = normalizePullRequestTitle(process.env.PULL_REQUEST_TITLE);
 
-	if (number || url) {
-		return { number, url };
+	if (number || url || title) {
+		return { number, url, title };
 	}
 
 	return undefined;

packages/wrangler/src/__tests__/preview.test.ts

@@ -169,6 +169,8 @@ function clearPreviewMetadataEnvs() {
 	vi.stubEnv("CI_COMMIT_SHA", "");
 	vi.stubEnv("CIRCLE_SHA1", "");
 	vi.stubEnv("COMMIT_SHA", "");
+	vi.stubEnv("CI_MERGE_REQUEST_TITLE", "");
+	vi.stubEnv("PULL_REQUEST_TITLE", "");
 }
 
 describe("wrangler preview", () => {
@@ -388,10 +390,12 @@ describe("wrangler preview", () => {
 				"https://git.example.com/acme/worker-project/pulls/13"
 			);
 			vi.stubEnv("PULL_REQUEST_NUMBER", "13");
+			vi.stubEnv("PULL_REQUEST_TITLE", "Add a cool new feature");
 
 			expect(getPullRequestMetadata()).toEqual({
 				number: "13",
 				url: "https://git.example.com/acme/worker-project/pulls/13",
+				title: "Add a cool new feature",
 			});
 		});
 
@@ -402,11 +406,45 @@ describe("wrangler preview", () => {
 					pull_request: {
 						number: 13,
 						html_url: "https://github.com/acme/worker-project/pull/13",
+						title: "Add a cool new feature",
 					},
 				})
 			);
 			vi.stubEnv("GITHUB_EVENT_PATH", "github-event.json");
 
+			expect(getPullRequestMetadata()).toEqual({
+				number: "13",
+				url: "https://github.com/acme/worker-project/pull/13",
+				title: "Add a cool new feature",
+			});
+		});
+
+		test("should not fail when the GitHub event pull request has no title", ({
+			expect,
+		}) => {
+			writeFileSync(
+				"github-event.json",
+				JSON.stringify({
+					pull_request: {
+						number: 13,
+						html_url: "https://github.com/acme/worker-project/pull/13",
+					},
+				})
+			);
+			vi.stubEnv("GITHUB_EVENT_PATH", "github-event.json");
+
+			expect(getPullRequestMetadata()).toEqual({
+				number: "13",
+				url: "https://github.com/acme/worker-project/pull/13",
+			});
+		});
+
+		test("should not recover a title from the GITHUB_REF fallback", ({
+			expect,
+		}) => {
+			vi.stubEnv("GITHUB_REF", "refs/pull/13/merge");
+			vi.stubEnv("GITHUB_REPOSITORY", "acme/worker-project");
+
 			expect(getPullRequestMetadata()).toEqual({
 				number: "13",
 				url: "https://github.com/acme/worker-project/pull/13",
@@ -419,6 +457,24 @@ describe("wrangler preview", () => {
 				"https://gitlab.example.com/acme/worker-project"
 			);
 			vi.stubEnv("CI_MERGE_REQUEST_IID", "13");
+			vi.stubEnv("CI_MERGE_REQUEST_TITLE", "Add a cool new feature");
+
+			expect(getPullRequestMetadata()).toEqual({
+				number: "13",
+				url: "https://gitlab.example.com/acme/worker-project/-/merge_requests/13",
+				title: "Add a cool new feature",
+			});
+		});
+
+		test("should treat a blank title the same as a missing one", ({
+			expect,
+		}) => {
+			vi.stubEnv(
+				"CI_PROJECT_URL",
+				"https://gitlab.example.com/acme/worker-project"
+			);
+			vi.stubEnv("CI_MERGE_REQUEST_IID", "13");
+			vi.stubEnv("CI_MERGE_REQUEST_TITLE", "   ");
 
 			expect(getPullRequestMetadata()).toEqual({
 				number: "13",
@@ -4689,6 +4745,7 @@ describe("wrangler preview", () => {
 				"https://gitlab.example.com/acme/worker-project.git"
 			);
 			vi.stubEnv("CI_MERGE_REQUEST_IID", "13");
+			vi.stubEnv("CI_MERGE_REQUEST_TITLE", "Add a cool new feature");
 			vi.stubEnv("CI_COMMIT_SHA", "abc123def456");
 
 			let deploymentRequestBody:
@@ -4697,6 +4754,7 @@ describe("wrangler preview", () => {
 							"workers/commit_sha"?: string;
 							"workers/message"?: string;
 							"workers/pull_request_number"?: string;
+							"workers/pull_request_title"?: string;
 							"workers/pull_request_url"?: string;
 							"workers/repository_url"?: string;
 							"workers/tag"?: string;
@@ -4767,6 +4825,7 @@ describe("wrangler preview", () => {
 				"workers/commit_sha": "abc123def456",
 				"workers/message": "preview note",
 				"workers/pull_request_number": "13",
+				"workers/pull_request_title": "Add a cool new feature",
 				"workers/pull_request_url":
 					"https://gitlab.example.com/acme/worker-project/-/merge_requests/13",
 				"workers/repository_url":
@@ -4778,6 +4837,8 @@ describe("wrangler preview", () => {
 				"https://gitlab.example.com/acme/worker-project/-/merge_requests/13"
 			);
 			expect(std.out).not.toContain("repository_url");
+			expect(std.out).not.toContain("pull_request_title");
+			expect(std.out).not.toContain("Add a cool new feature");
 		});
 
 		test("should fall back to HEAD commit metadata for annotations in CI", async ({

turbo.json

@@ -44,13 +44,15 @@
 		"GITHUB_REF",
 		"CI_MERGE_REQUEST_IID",
 		"CI_MERGE_REQUEST_PROJECT_URL",
+		"CI_MERGE_REQUEST_TITLE",
 		"PULL_REQUEST_URL",
 		"PR_URL",
 		"CHANGE_URL",
 		"CIRCLE_PULL_REQUEST",
 		"PULL_REQUEST_NUMBER",
 		"PR_NUMBER",
 		"CHANGE_ID",
+		"PULL_REQUEST_TITLE",
 		"GITHUB_SHA",
 		"CI_COMMIT_SHA",
 		"CIRCLE_SHA1",