Fix Firestore exports for Node (#5532)

Author: hsubox76

.changeset/big-cooks-drum.md

@@ -0,0 +1,5 @@
+---
+'@firebase/firestore': minor
+---
+
+Fix exports field to also point to Node ESM builds. This change requires Node.js version 10+.

packages/firestore/lite/package.json

@@ -2,7 +2,7 @@
   "name": "@firebase/firestore-lite",
   "description": "A lite version of the Firestore SDK",
   "main": "../dist/lite/index.node.cjs.js",
-  "main-esm": "../dist/lite/index.node.esm2017.js",
+  "main-esm": "../dist/lite/index.node.mjs",
   "module": "../dist/lite/index.browser.esm2017.js",
   "browser": "../dist/lite/index.browser.esm2017.js",
   "react-native": "../dist/lite/index.rn.esm2017.js",

packages/firestore/package.json

@@ -2,7 +2,7 @@
   "name": "@firebase/firestore",
   "version": "3.1.1",
   "engines": {
-    "node": "^8.13.0 || >=10.10.0"
+    "node": ">=10.10.0"
   },
   "description": "The Cloud Firestore component of the Firebase JS SDK.",
   "author": "Firebase <firebase-support@google.com> (https://firebase.google.com/)",
@@ -49,16 +49,22 @@
   },
   "exports": {
     ".": {
-      "node": "./dist/index.node.cjs.js",
+      "node": {
+        "require": "./dist/index.node.cjs.js",
+        "import": "./dist/index.node.mjs"
+      },
       "default": "./dist/index.esm2017.js"
     },
     "./lite": {
-      "node": "./dist/lite/index.node.cjs.js",
+      "node": {
+        "require": "./dist/lite/index.node.cjs.js",
+        "import": "./dist/lite/index.node.mjs"
+      },
       "default": "./dist/lite/index.browser.esm2017.js"
     }
   },
   "main": "dist/index.node.cjs.js",
-  "main-esm": "dist/index.node.cjs.esm2017.js",
+  "main-esm": "dist/index.node.mjs",
   "react-native": "dist/index.rn.js",
   "browser": "dist/index.esm2017.js",
   "module": "dist/index.esm2017.js",

packages/firestore/src/platform/node/grpc_connection.ts

@@ -15,13 +15,16 @@
  * limitations under the License.
  */
 
+// This is a hack fix for Node ES modules to use `require`.
+// @ts-ignore To avoid using `allowSyntheticDefaultImports` flag.
+import module from 'module';
+
 import {
   Metadata,
   GrpcObject,
   credentials as GrpcCredentials,
   ServiceError
 } from '@grpc/grpc-js';
-import { version as grpcVersion } from '@grpc/grpc-js/package.json';
 
 import { Token } from '../../api/credentials';
 import { DatabaseInfo } from '../../core/database_info';
@@ -35,6 +38,12 @@ import { logError, logDebug, logWarn } from '../../util/log';
 import { NodeCallback, nodePromise } from '../../util/node_api';
 import { Deferred } from '../../util/promise';
 
+// This is a hack fix for Node ES modules to use `require`.
+// @ts-ignore To avoid using `--module es2020` flag.
+const require = module.createRequire(import.meta.url);
+// eslint-disable-next-line @typescript-eslint/no-require-imports
+const { version: grpcVersion } = require('@grpc/grpc-js/package.json');
+
 const LOG_TAG = 'Connection';
 const X_GOOG_API_CLIENT_VALUE = `gl-node/${process.versions.node} fire/${SDK_VERSION} grpc/${grpcVersion}`;