feat(NODE-4522)!: remove callback support

.evergreen/config.yml

@@ -2132,7 +2132,7 @@ tasks:
       - func: bootstrap kms servers
       - func: run custom csfle tests
         vars:
-          CSFLE_GIT_REF: ff9e095eaf72f9e442761f69080dae159a395d94
+          CSFLE_GIT_REF: 3b3d0ebd2b180f4cb63adf937ecd985fce7e217b
   - name: run-custom-csfle-tests-5.0-master
     tags:
       - run-custom-dependency-tests
@@ -2162,7 +2162,7 @@ tasks:
       - func: bootstrap kms servers
       - func: run custom csfle tests
         vars:
-          CSFLE_GIT_REF: ff9e095eaf72f9e442761f69080dae159a395d94
+          CSFLE_GIT_REF: 3b3d0ebd2b180f4cb63adf937ecd985fce7e217b
   - name: run-custom-csfle-tests-rapid-master
     tags:
       - run-custom-dependency-tests
@@ -2192,7 +2192,7 @@ tasks:
       - func: bootstrap kms servers
       - func: run custom csfle tests
         vars:
-          CSFLE_GIT_REF: ff9e095eaf72f9e442761f69080dae159a395d94
+          CSFLE_GIT_REF: 3b3d0ebd2b180f4cb63adf937ecd985fce7e217b
   - name: run-custom-csfle-tests-latest-master
     tags:
       - run-custom-dependency-tests

.evergreen/generate_evergreen_tasks.js

@@ -579,7 +579,7 @@ BUILD_VARIANTS.push({
 const oneOffFuncAsTasks = []
 
 for (const version of ['5.0', 'rapid', 'latest']) {
-  for (const ref of ['ff9e095eaf72f9e442761f69080dae159a395d94', 'master']) {
+  for (const ref of ['3b3d0ebd2b180f4cb63adf937ecd985fce7e217b', 'master']) {
     oneOffFuncAsTasks.push({
       name: `run-custom-csfle-tests-${version}-${ref === 'master' ? ref : 'pinned-commit'}`,
       tags: ['run-custom-dependency-tests'],

.evergreen/run-tests.sh

@@ -52,7 +52,7 @@ else
   source "$DRIVERS_TOOLS"/.evergreen/csfle/set-temp-creds.sh
 fi
 
-npm install mongodb-client-encryption@">=2.3.0"
+npm install mongodb-client-encryption@">=2.4.0-alpha.0"
 npm install @mongodb-js/zstd
 npm install snappy
 

etc/notes/CHANGES_5.0.0.md

@@ -16,9 +16,56 @@ The following is a detailed collection of the changes in the major v5 release of
 
 ## Changes
 
+### Callback support migrated to `mongodb-legacy`
+
+If you are a callback user and you are not ready to use promises support for your workflow has **not** been removed.
+We have migrated it to a new package:
+
+- [`mongodb-legacy` Github](https://github.com/mongodb-js/nodejs-mongodb-legacy#readme)
+- [`mongodb-legacy` npm](https://www.npmjs.com/package/mongodb-legacy)
+
+The package wraps all of the driver's asynchronous operations and provides the _optional_ callback support. All the wrapped APIs offer an optional callback argument or a Promise return value so projects with mixed usage will continue to work.
+
+#### Example usage of equivalent callback and promise usage
+
+After installing the package and modifying imports the following example demonstrates equivalent usages of either `async`/`await` syntax, `.then`/`.catch` chaining, or callbacks:
+
+```ts
+// Just add '-legacy' to my mongodb import
+import { MongoClient } from 'mongodb-legacy';
+const client = new MongoClient();
+const db = client.db();
+const collection = db.collection('pets');
+
+// Legacy projects may have intermixed API usage:
+app.get('/endpoint_async_await', async (req, res) => {
+  try {
+    const result = await collection.findOne({})
+    res.end(JSON.stringify(result));
+  } catch (error) {
+    res.errorHandling(error)
+  }
+});
+
+app.get('/endpoint_promises', (req, res) => {
+  collection
+    .findOne({})
+    .then(result => res.end(JSON.stringify(result)))
+    .catch(error => res.errorHandling(error));
+});
+
+app.get('/endpoint_callbacks', (req, res) => {
+  collection.findOne({}, (error, result) => {
+    if (error) return res.errorHandling(error);
+    res.end(JSON.stringify(result));
+  });
+});
+```
+
+
 ### Dot Notation Typescript Support Removed By Default
 
-**NOTE** This is a **Typescript compile-time only** change. Dot notation in filters sent to MongoDB will still work the same.
+**NOTE:** This is a **Typescript compile-time only** change. Dot notation in filters sent to MongoDB will still work the same.
 
 Version 4.3.0 introduced Typescript support for dot notation in filter predicates.  For example: