Add deployment-alias-url for pages deployments with Wrangler 3.78.0+

.changeset/little-cougars-shout.md

@@ -0,0 +1,6 @@
+---
+"wrangler-action": minor
+---
+
+Adds `deployment-alias-url` output for Pages deployment aliases (since Wrangler v3.78.0): https://github.com/cloudflare/workers-sdk/pull/6643
+

README.md

@@ -262,7 +262,7 @@ Now when you run your workflow, you will see the full output of the Wrangler com
 
 > Note: the `command-stderr` output variable is also available if you need to parse the standard error output of the Wrangler command.
 
-### Using the `deployment-url` Output Variable
+### Using the `deployment-url` and `deployment-alias-url` Output Variables
 
 If you are executing a Wrangler command that results in either a Workers or Pages deployment, you can utilize the `deployment-url` output variable to get the URL of the deployment. For example, if you want to print the deployment URL after deploying your application, you can do the following:
 
@@ -287,6 +287,23 @@ The resulting output will look something like this:
 https://<your_pages_site>.pages.dev
 ```
 
+Pages deployments will also provide their alias URL (since Wrangler v3.78.0). You can use the `deployment-alias-url` output variable to get the URL of the deployment alias. This is useful for, for example, branch aliases for preview deployments.
+
+If the sample action above was used to deploy a branch other than main, you could use the following to get the branch URL:
+
+```yaml
+- name: print deployment-alias-url
+  env:
+    DEPLOYMENT_ALIAS_URL: ${{ steps.deploy.outputs.deployment-alias-url }}
+  run: echo $DEPLOYMENT_ALIAS_URL
+```
+
+Resulting in:
+
+```text
+https://new-feature.<your_pages_site>.pages.dev
+```
+
 ### Using a different package manager
 
 By default, this action will detect which package manager to use, based on the presence of a `package-lock.json`, `yarn.lock`, `pnpm-lock.yaml`, or `bun.lockb` file.

action.yml

@@ -51,3 +51,5 @@ outputs:
     description: "The error output of the Wrangler command (comes from stderr)"
   deployment-url:
     description: "If the command was a Workers or Pages deployment, this will be the URL of the deployment"
+  deployment-alias-url:
+    description: "If the command was a Workers or Pages deployment, this can be the URL of the deployment alias (if it exists) - needs wrangler >= 3.78.0"

src/index.ts

@@ -347,6 +347,15 @@ async function wranglerCommands() {
 					deploymentUrl = deploymentUrlMatch[0].trim();
 					setOutput("deployment-url", deploymentUrl);
 				}
+
+				// And also try to extract the alias URL (since wrangler@3.78.0)
+				const aliasUrlMatch = stdOut.match(
+					/alias URL: (https?:\/\/[a-zA-Z0-9-./]+)/,
+				);
+				if (aliasUrlMatch && aliasUrlMatch.length == 2 && aliasUrlMatch[1]) {
+					const aliasUrl = aliasUrlMatch[1].trim();
+					setOutput("deployment-alias-url", aliasUrl);
+				}
 			}
 		}
 	} finally {