feat: init workspace generates bundle script (#216 Phase 1)

- Add scripts.bundle to generated package.json
- Generate scripts/bundle.ts that scans workflows/*-entry.ts,
  uses Bun.build() to produce dist/*.esm.js + dist/*.d.ts
- External: @uncaged/workflow-* packages (per bundle contract)
- Add tests for new scaffold files

Testing: #217
Ref: #216

packages/cli-workflow/__tests__/init-workspace.test.ts

@@ -38,8 +38,16 @@ describe("init workspace", () => {
 
     const rootPkg = JSON.parse(await readFile(join(root, "package.json"), "utf8")) as {
       workspaces: string[];
+      scripts: { bundle: string };
     };
     expect(rootPkg.workspaces).toEqual(["templates/*", "workflows"]);
+    expect(rootPkg.scripts.bundle).toBe("bun run scripts/bundle.ts");
+
+    expect(await pathExists(join(root, "scripts", "bundle.ts"))).toBe(true);
+    const bundleSrc = await readFile(join(root, "scripts", "bundle.ts"), "utf8");
+    expect(bundleSrc).toContain("Bun.build");
+    expect(bundleSrc).toContain("-entry.ts");
+    expect(bundleSrc).toContain("distDir");
 
     const wfPkg = JSON.parse(await readFile(join(root, "workflows", "package.json"), "utf8")) as {
       type: string;

packages/cli-workflow/src/commands/init/workspace.ts

@@ -14,6 +14,9 @@ function rootPackageJson(workspaceName: string): string {
       private: true,
       type: "module",
       workspaces: ["templates/*", "workflows"],
+      scripts: {
+        bundle: "bun run scripts/bundle.ts",
+      },
     },
     null,
     2,
@@ -42,7 +45,7 @@ function biomeJson(): string {
     {
       $schema: "https://biomejs.dev/schemas/2.4.14/schema.json",
       files: {
-        includes: ["**", "!**/node_modules", "!**/dist"],
+        includes: ["**", "!**/node_modules", "!**/dist", "!scripts/bundle.ts"],
       },
       formatter: {
         indentWidth: 2,
@@ -190,6 +193,104 @@ uncaged-workflow init workspace ${workspaceName}
 `;
 }
 
+function bundleTs(): string {
+  return [
+    'import { mkdir, readdir, readFile, writeFile } from "node:fs/promises";',
+    'import { join } from "node:path";',
+    "",
+    'const rootDir = join(import.meta.dir, "..");',
+    'const workflowsDir = join(rootDir, "workflows");',
+    'const distDir = join(rootDir, "dist");',
+    "",
+    "type JsonDeps = {",
+    "  dependencies: Record<string, string> | null;",
+    "  devDependencies: Record<string, string> | null;",
+    "};",
+    "",
+    "function isEntryFile(name: string): boolean {",
+    '  return name.endsWith("-entry.ts");',
+    "}",
+    "",
+    "function entryStem(name: string): string {",
+    '  return name.slice(0, -".ts".length);',
+    "}",
+    "",
+    "async function uncagedWorkflowExternals(): Promise<string[]> {",
+    "  const names = new Set<string>();",
+    '  const paths = [join(rootDir, "package.json"), join(workflowsDir, "package.json")];',
+    "  for (const pkgPath of paths) {",
+    "    let raw: string;",
+    "    try {",
+    '      raw = await readFile(pkgPath, "utf8");',
+    "    } catch {",
+    "      continue;",
+    "    }",
+    "    const parsed = JSON.parse(raw) as JsonDeps;",
+    "    const blocks = [parsed.dependencies, parsed.devDependencies];",
+    "    for (const block of blocks) {",
+    "      if (block == null) {",
+    "        continue;",
+    "      }",
+    "      for (const key of Object.keys(block)) {",
+    '        if (key.startsWith("@uncaged/workflow")) {',
+    "          names.add(key);",
+    "        }",
+    "      }",
+    "    }",
+    "  }",
+    "  if (names.size === 0) {",
+    '    names.add("@uncaged/workflow-runtime");',
+    '    names.add("@uncaged/workflow-protocol");',
+    "  }",
+    "  return [...names];",
+    "}",
+    "",
+    "async function main(): Promise<void> {",
+    "  await mkdir(distDir, { recursive: true });",
+    "  let files: string[];",
+    "  try {",
+    "    files = await readdir(workflowsDir);",
+    "  } catch {",
+    '    console.error("bundle: missing workflows/ directory");',
+    "    process.exitCode = 1;",
+    "    return;",
+    "  }",
+    "  const entries = files.filter(isEntryFile);",
+    "  if (entries.length === 0) {",
+    '    console.warn("bundle: no *-entry.ts files under workflows/");',
+    "    return;",
+    "  }",
+    "  const external = await uncagedWorkflowExternals();",
+    "  for (const file of entries) {",
+    "    const stem = entryStem(file);",
+    "    const entryPath = join(workflowsDir, file);",
+    "    const result = await Bun.build({",
+    "      entrypoints: [entryPath],",
+    "      outdir: distDir,",
+    '      format: "esm",',
+    '      target: "node",',
+    "      splitting: false,",
+    '      naming: { entry: "[name].esm.js" },',
+    "      external,",
+    "    });",
+    "    if (!result.success) {",
+    "      for (const log of result.logs) {",
+    "        console.error(log);",
+    "      }",
+    `      throw new Error(\`bundle failed for \${file}\`);`,
+    "    }",
+    "    const dts =",
+    `      'export { run, descriptor } from "../workflows/' + stem + '.js";\\n';`,
+    `    await writeFile(join(distDir, \`\${stem}.d.ts\`), dts, "utf8");`,
+    `    console.log(\`bundle: \${stem} -> dist/\${stem}.esm.js\`);`,
+    "  }",
+    "}",
+    "",
+    "await main();",
+    "",
+  ].join("\n");
+}
+
 export async function cmdInitWorkspace(
   parentDir: string,
   workspaceName: string,
@@ -207,6 +308,7 @@ export async function cmdInitWorkspace(
   await mkdir(rootPath, { recursive: false });
   await mkdir(join(rootPath, "templates"), { recursive: false });
   await mkdir(join(rootPath, "workflows"), { recursive: false });
+  await mkdir(join(rootPath, "scripts"), { recursive: false });
 
   await Promise.all([
     writeFile(join(rootPath, "package.json"), rootPackageJson(workspaceName), "utf8"),
@@ -217,6 +319,7 @@ export async function cmdInitWorkspace(
     writeFile(join(rootPath, "templates", ".gitkeep"), "", "utf8"),
     writeFile(join(rootPath, "workflows", "package.json"), workflowsPackageJson(), "utf8"),
     writeFile(join(rootPath, "bunfig.toml"), bunfigToml(), "utf8"),
+    writeFile(join(rootPath, "scripts", "bundle.ts"), bundleTs(), "utf8"),
   ]);
 
   return ok({ rootPath });