feat: add a check for a default number of dependencies

src/plugins/resolved.js

@@ -1,12 +1,21 @@
 const Arborist = require('@npmcli/arborist');
-const { createError } = require('../lib/result');
+const { createError, createWarning } = require('../lib/result');
 const isGitURL = require('is-git-url');
 
+const NUM_OF_DEPS = 20;
+
 const resolvedPlugin = async (pkg, config, options, path = './npcheck-env') => {
   const results = [];
   const arborist = new Arborist({ path: path });
   const result = await arborist.loadActual();
   const children = result.children;
+  if (children.size - 1 > NUM_OF_DEPS) { // minus 1, the module itself
+    results.push(
+      createWarning(
+        `The module "${pkg.name}" has more dependencies (including sub-dependencies) than the default "${NUM_OF_DEPS}".`
+      )
+    );
+  }
   children.forEach(c => {
     const resolved = c.resolved.toString();
     if (isGitURL(resolved)) {