feat: support running jsr i without package arguments (#67)

Author: marvinhagemeister

src/bin.ts

@@ -112,11 +112,11 @@ ${
 `);
 }
 
-function getPackages(positionals: string[]): JsrPackage[] {
+function getPackages(positionals: string[], allowEmpty: boolean): JsrPackage[] {
   const pkgArgs = positionals.slice(1);
   const packages = pkgArgs.map((p) => JsrPackage.from(p));
 
-  if (pkgArgs.length === 0) {
+  if (!allowEmpty && pkgArgs.length === 0) {
     console.error(kl.red(`Missing packages argument.`));
     console.log();
     printHelp();
@@ -211,7 +211,8 @@ if (args.length === 0) {
 
     if (cmd === "i" || cmd === "install" || cmd === "add") {
       run(async () => {
-        const packages = getPackages(options.positionals);
+        const packages = getPackages(options.positionals, true);
+
         await install(packages, {
           mode: options.values["save-dev"]
             ? "dev"
@@ -223,7 +224,7 @@ if (args.length === 0) {
       });
     } else if (cmd === "r" || cmd === "uninstall" || cmd === "remove") {
       run(async () => {
-        const packages = getPackages(options.positionals);
+        const packages = getPackages(options.positionals, false);
         await remove(packages, { pkgManagerName });
       });
     } else if (cmd === "run") {

src/commands.ts

@@ -89,21 +89,24 @@ export interface InstallOptions extends BaseOptions {
 export async function install(packages: JsrPackage[], options: InstallOptions) {
   const pkgManager = await getPkgManager(process.cwd(), options.pkgManagerName);
 
-  if (pkgManager instanceof Bun) {
-    // Bun doesn't support reading from .npmrc yet
-    await setupBunfigToml(pkgManager.cwd);
-  } else if (pkgManager instanceof YarnBerry) {
-    // Yarn v2+ does not read from .npmrc intentionally
-    // https://yarnpkg.com/migration/guide#update-your-configuration-to-the-new-settings
-    await pkgManager.setConfigValue(
-      JSR_YARN_BERRY_CONFIG_KEY,
-      JSR_NPM_REGISTRY_URL,
-    );
-  } else {
-    await setupNpmRc(pkgManager.cwd);
+  if (packages.length > 0) {
+    if (pkgManager instanceof Bun) {
+      // Bun doesn't support reading from .npmrc yet
+      await setupBunfigToml(pkgManager.cwd);
+    } else if (pkgManager instanceof YarnBerry) {
+      // Yarn v2+ does not read from .npmrc intentionally
+      // https://yarnpkg.com/migration/guide#update-your-configuration-to-the-new-settings
+      await pkgManager.setConfigValue(
+        JSR_YARN_BERRY_CONFIG_KEY,
+        JSR_NPM_REGISTRY_URL,
+      );
+    } else {
+      await setupNpmRc(pkgManager.cwd);
+    }
+
+    console.log(`Installing ${kl.cyan(packages.join(", "))}...`);
   }
 
-  console.log(`Installing ${kl.cyan(packages.join(", "))}...`);
   await pkgManager.install(packages, options);
 }
 

test/commands.test.ts

@@ -240,6 +240,25 @@ describe("install", () => {
     }
   });
 
+  it("jsr i - runs '<pkg-manager> install' instead", async () => {
+    await runInTempDir(async (dir) => {
+      await runJsr(["i", "@std/encoding"], dir);
+
+      assert.ok(
+        fs.existsSync(path.join(dir, "node_modules")),
+        "No node_modules created.",
+      );
+
+      await fs.promises.rm(path.join(dir, "node_modules"), { recursive: true });
+
+      await runJsr(["i"], dir);
+      assert.ok(
+        fs.existsSync(path.join(dir, "node_modules")),
+        "No node_modules created.",
+      );
+    });
+  });
+
   it("jsr add --npm @std/[email protected] - forces npm", async () => {
     await withTempEnv(
       ["i", "--npm", "@std/[email protected]"],