fix(pnpm): support PnP

Closes #297

Author: JamieMason

npm/index.cjs

@@ -1,13 +1,15 @@
 #!/usr/bin/env node
 
 const { spawnSync } = require('node:child_process');
+const { dirname, join } = require('node:path');
 
 const args = process.argv.slice(2);
 const arch = process.arch;
 const [os, extension] = ['win32', 'cygwin'].includes(process.platform) ? ['windows', '.exe'] : [process.platform, ''];
 const optionalDep = `syncpack-${os}-${arch}`;
-const pkgSpecifier = `${optionalDep}/bin/syncpack${extension}`;
-const pathToBinary = require.resolve(pkgSpecifier);
+const binaryName = `syncpack${extension}`;
+
+const pathToBinary = resolveBinaryPath();
 
 process.exit(
   spawnSync(pathToBinary, args, {
@@ -16,3 +18,21 @@ process.exit(
     env: process.env,
   }).status || 0,
 );
+
+function resolveBinaryPath() {
+  // Strategy 1: Resolve via package.json for pnpm Plug'n'Play
+  try {
+    const packageJsonPath = require.resolve(`${optionalDep}/package.json`);
+    const packageDir = dirname(packageJsonPath);
+    return join(packageDir, 'bin', binaryName);
+  } catch (_) {}
+
+  // Strategy 2: Original approach (works with traditional node_modules)
+  try {
+    return require.resolve(`${optionalDep}/bin/${binaryName}`);
+  } catch (_) {}
+
+  throw new Error(
+    `Failed to resolve binary for ${os}-${arch}. Please ensure ${optionalDep} is installed as an optional dependency.`,
+  );
+}