Convert helper.js to typescript

Author: richvdh

tests/helper.js renamed to tests/helper.ts

@@ -1,6 +1,22 @@
-const { DeviceLists, RequestType, KeysUploadRequest, KeysQueryRequest } = require("@matrix-org/matrix-sdk-crypto-wasm");
+/*
+Copyright 2022-2025 The Matrix.org Foundation C.I.C.
 
-function* zip(...arrays) {
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import { DeviceLists, RequestType, KeysUploadRequest, KeysQueryRequest } from "@matrix-org/matrix-sdk-crypto-wasm";
+
+export function* zip(...arrays) {
     const len = Math.min(...arrays.map((array) => array.length));
 
     for (let nth = 0; nth < len; ++nth) {
@@ -10,7 +26,7 @@ function* zip(...arrays) {
 
 // Add a machine to another machine, i.e. be sure a machine knows
 // another exists.
-async function addMachineToMachine(machineToAdd, machine) {
+export async function addMachineToMachine(machineToAdd: OlmMachine, machine: OlmMachine): Promise<void> {
     const toDeviceEvents = JSON.stringify([]);
     const changedDevices = new DeviceLists();
     const oneTimeKeyCounts = new Map();
@@ -88,8 +104,3 @@ async function addMachineToMachine(machineToAdd, machine) {
         expect(marked).toStrictEqual(true);
     }
 }
-
-module.exports = {
-    zip,
-    addMachineToMachine,
-};

tsconfig.json

@@ -2,7 +2,9 @@
     "extends": "@tsconfig/node18/tsconfig.json",
     "compilerOptions": {
         "lib": ["DOM"],
-        "allowJs": true
+        "allowJs": true,
+        // Allow .ts file extensions in `import`, otherwise Jest can't find `helper.ts`.
+        "allowImportingTsExtensions": true
     },
     "typedocOptions": {
         "entryPoints": ["index.d.ts"],