[wrangler] feat: generate wrangler.jsonc in init --from-dash instead of wrangler.toml

.changeset/pretty-days-find.md

@@ -0,0 +1,5 @@
+---
+"wrangler": minor
+---
+
+feat: `wrangler init --from-dash` now generates `wrangler.jsonc` config files instead of `wrangler.toml` files

packages/create-cloudflare/e2e/tests/cli/cli.test.ts

@@ -442,11 +442,14 @@ describe("Create Cloudflare CLI", () => {
 				);
 				expect(output).toContain("Pre-existing Worker (from Dashboard)");
 				expect(output).toContain("Application created successfully!");
-				expect(fs.existsSync(join(project.path, "wrangler.jsonc"))).toBe(false);
+				expect(fs.existsSync(join(project.path, "wrangler.jsonc"))).toBe(true);
 				expect(fs.existsSync(join(project.path, "wrangler.json"))).toBe(false);
+				expect(fs.existsSync(join(project.path, "wrangler.toml"))).toBe(false);
 				expect(
-					fs.readFileSync(join(project.path, "wrangler.toml"), "utf8"),
-				).toContain('FOO = "bar"');
+					JSON.parse(
+						fs.readFileSync(join(project.path, "wrangler.jsonc"), "utf8"),
+					),
+				).toMatchObject({ vars: { FOO: "bar" } });
 			},
 		);
 	});

packages/create-cloudflare/templates/pre-existing/c3.ts

@@ -1,3 +1,4 @@
+import { existsSync } from "fs";
 import { cp, mkdtemp } from "fs/promises";
 import { tmpdir } from "os";
 import { join } from "path";
@@ -57,11 +58,24 @@ export async function copyExistingWorkerFiles(ctx: C3Context) {
 		{ recursive: true },
 	);
 
-	// copy ./wrangler.toml from the downloaded Worker
-	await cp(
-		join(tempdir, ctx.args.existingScript, "wrangler.toml"),
-		join(ctx.project.path, "wrangler.toml"),
-	);
+	// copy wrangler config file from the downloaded Worker
+	const configFiles = ["wrangler.jsonc", "wrangler.json", "wrangler.toml"];
+	let configFileCopied = false;
+
+	for (const configFile of configFiles) {
+		const sourcePath = join(tempdir, ctx.args.existingScript, configFile);
+		if (existsSync(sourcePath)) {
+			await cp(sourcePath, join(ctx.project.path, configFile));
+			configFileCopied = true;
+			break;
+		}
+	}
+
+	if (!configFileCopied) {
+		throw new Error(
+			`No wrangler configuration file found in downloaded worker. Expected one of: ${configFiles.join(", ")}`,
+		);
+	}
 }
 
 const config: TemplateConfig = {