fix: custom debug function not processing all args

lib/drivers/node-mongodb-native/collection.js

@@ -208,8 +208,14 @@ function iter(i) {
 
     if (debug) {
       if (typeof debug === 'function') {
+        let argsToAdd = null;
+        if (typeof args[args.length - 1] == 'function') {
+          argsToAdd = args.slice(0, args.length - 1);
+        } else {
+          argsToAdd = args;
+        }
         debug.apply(_this,
-          [_this.name, i].concat(args.slice(0, args.length - 1)));
+          [_this.name, i].concat(argsToAdd));
       } else if (debug instanceof stream.Writable) {
         this.$printToStream(_this.name, i, args, debug);
       } else {

test/docs/debug.test.js

@@ -105,7 +105,7 @@ describe('debug: shell', function() {
     await Test.create({ name: 'foo' });
     assert.equal(args.length, 1);
     assert.equal(args[0][1], 'insertOne');
-    assert.strictEqual(args[0][3], undefined);
+    assert.strictEqual(args[0][4], undefined);
 
     await m.disconnect();
   });

test/index.test.js

@@ -90,6 +90,19 @@ describe('mongoose module:', function() {
     await mongoose.disconnect();
   });
 
+  it('should collect the args correctly gh-13364', async function() {
+    const util = require('util');
+    const mongoose = new Mongoose();
+    const conn = await mongoose.connect(start.uri);
+    let actual = '';
+    mongoose.set('debug', (collectionName, methodName, ...methodArgs) => {
+      actual = `${collectionName}.${methodName}(${util.inspect(methodArgs).slice(2, -2)})`;
+    });
+    const user = conn.connection.collection('User');
+    await user.findOne({ key: 'value' });
+    assert.equal('User.findOne({ key: \'value\' })', actual);
+  });
+
   it('{g,s}etting options', function() {
     const mongoose = new Mongoose();
 

test/query.test.js

@@ -3984,7 +3984,7 @@ describe('Query', function() {
 
     let lastOptions = {};
     m.set('debug', function(_coll, _method, ...args) {
-      lastOptions = args[args.length - 1];
+      lastOptions = args[args.length - 2];
     });
 
     const connDebug = m.createConnection(start.uri);