[web] add function to retrieve WASM module

Summary:
Making sure that module is now typed in Flow, and making it easier to retrieve the module (will be helpful in tests later).

Depends on D8545

Test Plan:
 1. `flow`
 2. Check if result is still logged

Reviewers: michal, tomek

Reviewed By: michal

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D8547

web/database/db-module.js

@@ -0,0 +1,25 @@
+// @flow
+
+import Module from './_generated/comm-query-executor.js';
+import type { EmscriptenModule } from './types/module.js';
+import { DEFAULT_COMM_QUERY_EXECUTOR_FILENAME } from './utils/constants.js';
+
+function getDatabaseModule(
+  databaseModuleFilename?: ?string,
+  databaseModuleFilePath?: string,
+): EmscriptenModule {
+  const fileName = databaseModuleFilename
+    ? databaseModuleFilename
+    : DEFAULT_COMM_QUERY_EXECUTOR_FILENAME;
+
+  return Module({
+    locateFile: (path: string, prefix?: string) => {
+      if (databaseModuleFilePath) {
+        return `${databaseModuleFilePath}/${fileName}`;
+      }
+      return `${prefix ?? ''}${fileName}`;
+    },
+  });
+}
+
+export { getDatabaseModule };

web/database/utils/constants.js

@@ -10,6 +10,8 @@ export const CURRENT_USER_ID_KEY = 'current_user_id';
 export const DATABASE_WORKER_PATH = '/worker/database';
 export const SQLJS_FILE_PATH = '/compiled/webworkers';
 
+export const DEFAULT_COMM_QUERY_EXECUTOR_FILENAME = 'comm_query_executor.wasm';
+
 export const DB_SUPPORTED_OS: $ReadOnlyArray<string> = [
   'Windows 10',
   'Linux',

web/database/worker/db-worker.js

@@ -19,7 +19,7 @@ import {
   type WorkerRequestProxyMessage,
   workerWriteRequests,
 } from '../../types/worker-types.js';
-import Module from '../_generated/comm-query-executor.js';
+import { getDatabaseModule } from '../db-module.js';
 import { migrate, setupSQLiteDB } from '../queries/db-queries.js';
 import {
   getAllDrafts,
@@ -60,22 +60,13 @@ let encryptionKey: ?CryptoKey = null;
 let persistNeeded: boolean = false;
 let persistInProgress: boolean = false;
 
-const defaultCommQueryExecutorFilename = 'comm_query_executor.wasm';
-
 async function initDatabase(
   sqljsFilePath: string,
   sqljsFilename: ?string,
   commQueryExecutorFilename: ?string,
   encryptionKeyJWK?: ?SubtleCrypto$JsonWebKey,
 ) {
-  const dbModule = Module({
-    locateFile: function () {
-      if (commQueryExecutorFilename) {
-        return `${sqljsFilePath}/${commQueryExecutorFilename}`;
-      }
-      return `${sqljsFilePath}/${defaultCommQueryExecutorFilename}`;
-    },
-  });
+  const dbModule = getDatabaseModule(commQueryExecutorFilename, sqljsFilePath);
 
   try {
     const result = dbModule.CommQueryExecutor.testDBOperation();