Merge pull request #1413 from mathjax/update/pnpm_in_components

Update components compilation to use pnpm

Author: dpvc

components/bin/pack

@@ -74,17 +74,17 @@ async function readJSON(dir) {
   return new Promise((ok, fail) => {
     const buffer = [];
     const child = spawn(
-      'npx',
+      'node',
       [
-        'webpack',
+        require.resolve(path.join('webpack', 'bin', 'webpack.js')),
         '--env', `dir=${path.relative(packDir, path.resolve(dir))}`,
         '--env', `bundle=${bundle}`,
         '--json',
         '-c', path.relative(packDir, path.join(compPath, 'webpack.config.' + target))
       ],
       {
         cwd: packDir,
-        shell: true,
+        shell: process.platform === 'Win32',
       }
     );
     child.stdout.on('data', (data) => buffer.push(String(data)));