Feature: support multiple package managers

.changeset/real-points-carry.md

@@ -0,0 +1,5 @@
+---
+"@arethetypeswrong/cli": minor
+---
+
+Add support for multiple package managers like [pnpm](https://pnpm.io/) and [yarn](https://yarnpkg.com/) ([#173](https://github.com/arethetypeswrong/arethetypeswrong.github.io/issues/173))

packages/cli/package.json

@@ -49,6 +49,7 @@
     "@types/marked-terminal": "^3.1.3",
     "@types/node": "^20.2.5",
     "@types/semver": "^7.5.3",
+    "@types/which-pm-runs": "^1.0.2",
     "ts-expose-internals-conditionally": "1.0.0-empty.0",
     "typescript": "5.3.3"
   },
@@ -59,7 +60,8 @@
     "commander": "^10.0.1",
     "marked": "^9.1.2",
     "marked-terminal": "^6.0.0",
-    "semver": "^7.5.4"
+    "semver": "^7.5.4",
+    "which-pm-runs": "^1.1.0"
   },
   "engines": {
     "node": ">=18"

packages/cli/src/index.ts

@@ -15,6 +15,8 @@ import { readConfig } from "./readConfig.js";
 import * as render from "./render/index.js";
 import { major, minor } from "semver";
 import { getExitCode } from "./getExitCode.js";
+import { determinePackCommand, determineTarballFilename } from "./utils.js";
+import detectPackageManager from "which-pm-runs";
 
 const packageJson = createRequire(import.meta.url)("../package.json");
 const version = packageJson.version;
@@ -74,8 +76,8 @@ particularly ESM-related module resolution issues.`,
   .option("--exclude-entrypoints <entrypoints...>", "Specify entrypoints to exclude from checking.")
   .option(
     "--entrypoints-legacy",
-    'In packages without the `exports` field, every file is an entry point. Specifying this option ' +
-    'only takes effect when no entrypoints are automatically detected, or explicitly provided with other options.'
+    "In packages without the `exports` field, every file is an entry point. Specifying this option " +
+      "only takes effect when no entrypoints are automatically detected, or explicitly provided with other options.",
   )
   .addOption(
     new Option("--ignore-rules <rules...>", "Specify rules to ignore").choices(Object.values(problemFlags)).default([]),
@@ -159,29 +161,30 @@ particularly ESM-related module resolution issues.`,
             );
           }
 
+          const packageManager = (await detectPackageManager()?.name) ?? "npm";
+          const packCommand = determinePackCommand(packageManager);
+
           if (!opts.pack) {
             if (!process.stdout.isTTY) {
               program.error(
-                "Specifying a directory requires the --pack option to confirm that running `npm pack` is ok.",
+                `Specifying a directory requires the --pack option to confirm that running \`${packCommand}\` is ok.`,
               );
             }
             const rl = readline.createInterface(process.stdin, process.stdout);
             const answer = await new Promise<string>((resolve) => {
-              rl.question(`Run \`npm pack\`? (Pass -P/--pack to skip) (Y/n) `, resolve);
+              rl.question(`Run \`${packCommand}\`? (Pass -P/--pack to skip) (Y/n) `, resolve);
             });
             rl.close();
             if (answer.trim() && !answer.trim().toLowerCase().startsWith("y")) {
               process.exit(1);
             }
           }
 
-          const manifest = JSON.parse(await readFile(path.join(fileOrDirectory, "package.json"), { encoding: "utf8" }));
-          fileName = deleteTgz = path.join(
-            fileOrDirectory,
-            // https://github.com/npm/cli/blob/f875caa86900122819311dd77cde01c700fd1817/lib/utils/tar.js#L123-L125
-            `${manifest.name.replace("@", "").replace("/", "-")}-${manifest.version}.tgz`,
-          );
-          execSync("npm pack", { cwd: fileOrDirectory, encoding: "utf8", stdio: "ignore" });
+          fileName = deleteTgz = await determineTarballFilename(fileOrDirectory);
+
+          const packCommandWithFilename = determinePackCommand(packageManager, fileName);
+
+          execSync(packCommandWithFilename, { cwd: fileOrDirectory, encoding: "utf8", stdio: "ignore" });
         }
         const file = await readFile(fileName);
         const data = new Uint8Array(file);

packages/cli/src/utils.ts

@@ -0,0 +1,26 @@
+import { readFile } from "fs/promises";
+import path from "path";
+
+/** Determine which CLI command to use to create a tarball from a package. */
+export const determinePackCommand = (packageManager: string, filename?: string) => {
+  switch (packageManager) {
+    case "pnpm":
+      // PNPM does not support custom destination filenames (see: https://github.com/pnpm/pnpm/issues/7834)
+      return "pnpm pack";
+    case "yarn":
+      return filename ? `yarn pack --out ${filename}` : "yarn pack";
+    default:
+      return filename ? `npm pack ${filename}` : "npm pack";
+  }
+};
+
+/** Determine which tarball filename to use. */
+export const determineTarballFilename = async (fileOrDirectory: string) => {
+  const manifest = JSON.parse(await readFile(path.join(fileOrDirectory, "package.json"), { encoding: "utf8" }));
+
+  return path.join(
+    fileOrDirectory,
+    // https://github.com/npm/cli/blob/f875caa86900122819311dd77cde01c700fd1817/lib/utils/tar.js#L123-L125
+    `${manifest.name.replace("@", "").replace("/", "-")}-${manifest.version}.tgz`,
+  );
+};