chore!: Build as ECMAScript module

Jest's support for ESM is lacking, so for simplicity this also changes
the test suite to use Node's built-in test runner and typescript
support, and jest's `expect` package.

This change is breaking because any non-ESM consuming packages must now
have minumum Node version of 20.19.0.

Author: nicknovitski

.env

@@ -0,0 +1,2 @@
+NODE_OPTIONS=--test-coverage-branches=100 --test-coverage-functions=100 --test-coverage-lines=100 --test-coverage-exclude src/**/*test.ts
+NODE_V8_COVERAGE=./coverage

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [20, 22, 24]
+        node-version: [22, 24]
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - run: corepack enable

package.json

@@ -2,8 +2,10 @@
   "name": "expo-server-sdk",
   "version": "4.0.0",
   "description": "Server-side library for working with Expo using Node.js",
-  "main": "build/ExpoClient.js",
-  "types": "build/ExpoClient.d.ts",
+  "type": "module",
+  "main": "./build/ExpoClient.js",
+  "exports": "./build/ExpoClient.js",
+  "types": "./build/ExpoClient.d.ts",
   "files": [
     "build"
   ],
@@ -14,24 +16,10 @@
     "build": "yarn prepack",
     "lint": "eslint",
     "prepack": "tsc --project tsconfig.build.json",
-    "test": "jest",
+    "test": "node --test --experimental-test-coverage --env-file .env",
     "tsc": "tsc",
     "watch": "tsc --watch"
   },
-  "jest": {
-    "coverageDirectory": "<rootDir>/../coverage",
-    "coverageThreshold": {
-      "global": {
-        "branches": 100,
-        "functions": 100,
-        "lines": 100,
-        "statements": 0
-      }
-    },
-    "preset": "ts-jest",
-    "rootDir": "src",
-    "testEnvironment": "node"
-  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/expo/expo-server-sdk-node.git"
@@ -52,18 +40,18 @@
     "promise-retry": "^2.0.1"
   },
   "devDependencies": {
+    "@tsconfig/node-ts": "23.6.2",
     "@tsconfig/node20": "20.1.6",
     "@tsconfig/strictest": "2.0.5",
     "@types/node": "22.17.2",
     "@types/node-fetch": "2.6.12",
     "@types/promise-retry": "1.1.6",
     "eslint": "9.33.0",
     "eslint-config-universe": "15.0.3",
-    "jest": "29.7.0",
+    "expect": "30.2.0",
     "jiti": "2.4.2",
     "msw": "2.10.5",
     "prettier": "3.6.2",
-    "ts-jest": "29.4.1",
     "typescript": "5.9.2"
   },
   "packageManager": "[email protected]"

src/ExpoClient.ts

@@ -19,7 +19,7 @@ import {
   pushNotificationReceiptChunkLimit,
   requestRetryMinTimeout,
   sendApiUrl,
-} from './ExpoClientValues';
+} from './ExpoClientValues.ts';
 
 export class Expo {
   static pushNotificationChunkSizeLimit = pushNotificationChunkLimit;
@@ -204,7 +204,7 @@ export class Expo {
   private async requestAsync(url: string, options: RequestOptions): Promise<any> {
     let requestBody: string | Buffer | undefined;
 
-    const sdkVersion = require('../package.json').version;
+    const sdkVersion = (await import('../package.json')).default.version;
     const requestHeaders = new Headers({
       Accept: 'application/json',
       'Accept-Encoding': 'gzip, deflate',

src/__tests__/ExpoClient-test.ts

@@ -1,12 +1,13 @@
-import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, test } from '@jest/globals';
+import { expect } from 'expect';
+import ExpoClient, { type ExpoPushMessage } from 'expo-server-sdk';
 import { http, HttpResponse } from 'msw';
 import { setupServer } from 'msw/node';
 import assert from 'node:assert';
 import { randomUUID } from 'node:crypto';
+import { after, afterEach, before, beforeEach, describe, test } from 'node:test';
 import { gunzipSync } from 'node:zlib';
 
-import ExpoClient, { ExpoPushMessage } from '../ExpoClient';
-import { getReceiptsApiUrl, sendApiUrl } from '../ExpoClientValues';
+import { getReceiptsApiUrl, sendApiUrl } from '../ExpoClientValues.ts';
 
 const accessToken = 'foobar';
 const mockTickets = [{ status: 'ok', id: randomUUID() }];
@@ -69,11 +70,11 @@ const server = setupServer(
   }),
 );
 
-beforeAll(() => {
+before(() => {
   server.listen({ onUnhandledRequest: 'error' });
 });
 
-afterAll(() => {
+after(() => {
   server.close();
 });
 

tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "extends": ["@tsconfig/strictest/tsconfig", "@tsconfig/node20/tsconfig"],
+  "extends": ["@tsconfig/strictest/tsconfig", "@tsconfig/node20/tsconfig", "@tsconfig/node-ts/tsconfig"],
   "compilerOptions": {
     "declaration": true,
     "noEmit": true,