feat: detect package manager

Author: piotr-layerzero

src/detectPackageManager.ts

@@ -0,0 +1,16 @@
+import Path from "node:path";
+import { PackageManager } from "./types.js";
+import { isRootDir as isPnpmRootDir } from "./pnpmWorkspace.js";
+import { isRootDir as isYarnRootDir } from "./yarnWorkspace.js";
+
+export function detectPackageManager(cwd: string): PackageManager {
+	const paths = cwd
+		.split(Path.sep)
+		.map((_, idx) => Path.join(cwd, "../".repeat(idx)));
+
+	for (const path of paths) {
+		if (isPnpmRootDir(path)) return "pnpm";
+		if (isYarnRootDir(path)) return "yarn";
+	}
+	throw new Error("Package manager could not be detected");
+}

src/index.ts

@@ -8,6 +8,8 @@ import * as yarn from "./yarnWorkspace.js";
 import { compare } from "./git.js";
 import { debug } from "./debug.js";
 import { parseArgs } from "./parseArgs.js";
+import { PackageManager } from "./types.js";
+import { detectPackageManager } from "./detectPackageManager.js";
 
 const cwd = process.cwd();
 
@@ -21,21 +23,21 @@ const configuration = parseArgs({
 			type: "boolean",
 			default: false,
 		},
-		yarn: {
-			type: "boolean",
-			default: false,
-		},
 	},
 });
 
+const log = debug(configuration.values.verbose);
+
+const packageManager: PackageManager = detectPackageManager(cwd);
+
+log({ packageManager });
+
 const {
 	readWorkspaceDirs,
 	readWorkspaceSettings,
 	resolveWorkspaceDeps,
 	isRootDir,
-} = configuration.values.yarn ? yarn : pnpm;
-
-const log = debug(configuration.values.verbose);
+} = packageManager === "pnpm" ? pnpm : yarn;
 
 const [gitFromPointer = "HEAD^", gitToPointer = "HEAD"] =
 	configuration.positionals;

src/pnpmWorkspace.ts

@@ -2,12 +2,12 @@ import { readFile, readdir } from "node:fs/promises";
 import Path from "node:path";
 import { existsSync } from "node:fs";
 import { fileExist, readJson } from "./utils.js";
-import { Ctx, Workspace, PackageJson } from "./types.js";
+import { Ctx, Workspace, PackageJson, WorkspaceSettings } from "./types.js";
 
-export async function readWorkspaceSettings({ rootDir, cwd }: Ctx): Promise<{
-	workspaces: Record<string, Workspace>;
-	currentWorkspace: Workspace;
-}> {
+export async function readWorkspaceSettings({
+	rootDir,
+	cwd,
+}: Ctx): Promise<WorkspaceSettings> {
 	const workspaceDirs = await readWorkspaceDirs({ rootDir, cwd });
 
 	const workspaces = (await Promise.all(workspaceDirs.map(findPackagesInDir)))

src/types.ts

@@ -19,3 +19,5 @@ export type WorkspaceSettings = {
 	workspaces: Record<string, Workspace>;
 	currentWorkspace: Workspace;
 };
+
+export type PackageManager = "yarn" | "npm" | "pnpm";