polish: include a copy-pastable message when trying to publish withou…

…t a compatibility date

.changeset/quick-flowers-help.md

@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+polish: include a copy-pastable message when trying to publish without a compatibility date

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

@@ -2876,6 +2876,25 @@ addEventListener('fetch', event => {});`
       expect(std.err).toMatchInlineSnapshot(`""`);
     });
 
+    it("should error if a compatibility_date is not available in wrangler.toml or cli args", async () => {
+      writeWorkerSource();
+      let err: undefined | Error;
+      try {
+        await runWrangler("publish ./index.js");
+      } catch (e) {
+        err = e as Error;
+      }
+
+      expect(err?.message.replaceAll(/\d/g, "X")).toMatchInlineSnapshot(`
+        "A compatibility_date is required when publishing. Add the following to your wrangler.toml file:.
+            \`\`\`
+            compatibility_date = \\"XXXX-XX-XX\\"
+            \`\`\`
+            Or you could pass it in your terminal as \`--compatibility-date XXXX-XX-XX\`
+        See https://developers.cloudflare.com/workers/platform/compatibility-dates for more information."
+      `);
+    });
+
     it("should enable the workers.dev domain if workers_dev is undefined and subdomain is not already available", async () => {
       writeWranglerToml();
       writeWorkerSource();

packages/wrangler/src/publish.ts

@@ -224,10 +224,18 @@ export default async function publish(props: Props): Promise<void> {
   // TODO: warn if git/hg has uncommitted changes
   const { config, accountId } = props;
 
-  assert(
-    props.compatibilityDate || config.compatibility_date,
-    "A compatibility_date is required when publishing. Add one to your wrangler.toml file, or pass it in your terminal as --compatibility-date. See https://developers.cloudflare.com/workers/platform/compatibility-dates for more information."
-  );
+  if (!(props.compatibilityDate || config.compatibility_date)) {
+    const compatibilityDateStr = `${new Date().getFullYear()}-${(
+      new Date().getMonth() + ""
+    ).padStart(2, "0")}-${(new Date().getDate() + "").padStart(2, "0")}`;
+
+    throw new Error(`A compatibility_date is required when publishing. Add the following to your wrangler.toml file:.
+    \`\`\`
+    compatibility_date = "${compatibilityDateStr}"
+    \`\`\`
+    Or you could pass it in your terminal as \`--compatibility-date ${compatibilityDateStr}\`
+See https://developers.cloudflare.com/workers/platform/compatibility-dates for more information.`);
+  }
 
   const triggers = props.triggers || config.triggers?.crons;
   const routes =