feat(NODE-6584)!: improve typing for filepaths in AutoEncryptionOptions (#4341)

Co-authored-by: Bailey Pearson <bailey.pearson@mongodb.com>

Author: addaleax

src/client-side-encryption/auto_encrypter.ts

@@ -69,7 +69,7 @@ export interface AutoEncryptionOptions {
     /** If true, autoEncryption will not attempt to spawn a mongocryptd before connecting  */
     mongocryptdBypassSpawn?: boolean;
     /** The path to the mongocryptd executable on the system */
-    mongocryptdSpawnPath?: string;
+    mongocryptdSpawnPath?: `${string}mongocryptd${'.exe' | ''}`;
     /** Command line arguments to use when auto-spawning a mongocryptd */
     mongocryptdSpawnArgs?: string[];
     /**
@@ -95,7 +95,7 @@ export interface AutoEncryptionOptions {
      *
      * Requires the MongoDB Crypt shared library, available in MongoDB 6.0 or higher.
      */
-    cryptSharedLibPath?: string;
+    cryptSharedLibPath?: `${string}mongo_crypt_v${number}.${'so' | 'dll' | 'dylib'}`;
     /**
      * If specified, never use mongocryptd and instead fail when the MongoDB Crypt
      * shared library could not be loaded.

test/types/client-side-encryption.test-d.ts

@@ -1,6 +1,7 @@
 import { expectAssignable, expectError, expectNotAssignable, expectType } from 'tsd';
 
 import type {
+  AutoEncryptionOptions,
   AWSEncryptionKeyOptions,
   AzureEncryptionKeyOptions,
   ClientEncryption,
@@ -107,3 +108,52 @@ expectAssignable<RequiredCreateEncryptedCollectionSettings>({
 
   expectNotAssignable<ClientEncryptionDataKeyProvider>('arbitrary string');
 }
+
+{
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      mongocryptdSpawnPath: 'mongocryptd'
+    }
+  });
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      mongocryptdSpawnPath: 'mongocryptd.exe'
+    }
+  });
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      mongocryptdSpawnPath: '/usr/bin/mongocryptd'
+    }
+  });
+  expectNotAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      mongocryptdSpawnPath: 'mongo_crypt_v1.so'
+    }
+  });
+
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      cryptSharedLibPath: 'mongo_crypt_v1.so'
+    }
+  });
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      cryptSharedLibPath: 'mongo_crypt_v1.dll'
+    }
+  });
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      cryptSharedLibPath: 'mongo_crypt_v1.dylib'
+    }
+  });
+  expectAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      cryptSharedLibPath: '/usr/lib/mongo_crypt_v1.dylib'
+    }
+  });
+  expectNotAssignable<AutoEncryptionOptions>({
+    extraOptions: {
+      cryptSharedLibPath: 'libmongocrypt.so'
+    }
+  });
+}