feat: add init command

src/bin.ts

@@ -3,7 +3,7 @@ import * as kl from "kolorist";
 import * as fs from "node:fs";
 import * as path from "node:path";
 import { parseArgs } from "node:util";
-import { install, remove } from "./commands";
+import { init, install, remove } from "./commands";
 import { JsrPackage, JsrPackageNameError, prettyTime, setDebug } from "./utils";
 import { PkgManagerName } from "./pkg_manager";
 
@@ -34,6 +34,7 @@ Commands:
 ${prettyPrintRow([
   ["i, install, add", "Install one or more jsr packages"],
   ["r, uninstall, remove", "Remove one or more jsr packages"],
+  ["init", "Create an empty project"],
 ])}
 
 Options:
@@ -130,6 +131,8 @@ if (args.length === 0) {
       const packages = getPackages(options.positionals);
       await remove(packages, { pkgManagerName });
     });
+  } else if (cmd === "init") {
+    run(() => init(process.cwd()));
   } else {
     console.error(kl.red(`Unknown command: ${cmd}`));
     console.log();

src/commands.ts

@@ -44,3 +44,58 @@ export async function remove(packages: JsrPackage[], options: BaseOptions) {
   const pkgManager = await getPkgManager(process.cwd(), options.pkgManagerName);
   await pkgManager.remove(packages);
 }
+
+async function createFiles(cwd: string, files: Record<string, string>) {
+  await Promise.all(
+    Array.from(Object.entries(files)).map(([file, content]) => {
+      const filePath = path.join(cwd, file);
+      return fs.promises.writeFile(filePath, content, "utf-8");
+    })
+  );
+}
+
+export async function init(cwd: string) {
+  await setupNpmRc(cwd);
+
+  await createFiles(cwd, {
+    "package.json": JSON.stringify(
+      {
+        name: "@<scope>/<package_name>",
+        version: "0.0.1",
+        description: "",
+        license: "ISC",
+        type: "module",
+      },
+      null,
+      2
+    ),
+    // TODO: Rename to jsr.json, once supported in Deno
+    // deno.json
+    "deno.json": JSON.stringify(
+      {
+        name: "@<scope>/<package_name>",
+        version: "0.0.1",
+        description: "",
+        exports: {
+          ".": "./mod.ts",
+        },
+      },
+      null,
+      2
+    ),
+    "mod.ts": [
+      "export function add(a: number, b: number): number {",
+      "  return a + b;",
+      "}",
+    ].join("\n"),
+    "tsconfig.json": JSON.stringify(
+      {
+        compilerOptions: {
+          moduleResolution: "NodeNext",
+        },
+      },
+      null,
+      2
+    ),
+  });
+}

test/commands.test.ts

@@ -192,3 +192,18 @@ describe("remove", () => {
     );
   });
 });
+
+describe("init", () => {
+  it("creates empty project", async () => {
+    await withTempEnv(["init"], async (_getPkgJson, dir) => {
+      const files = await fs.promises.readdir(dir);
+      assert.deepEqual(files.sort(), [
+        ".npmrc",
+        "deno.json",
+        "mod.ts",
+        "package.json",
+        "tsconfig.json",
+      ]);
+    });
+  });
+});