Default vite config to support using local build of crypto wasm (#3038)

* Devex: Default vite config to support using local build of crypto wasm

* use realpathSync and make it work with linked and not-linked
We need to use sync because an async defineConfig fails for the embedded exports.

* also allow just linking matrix-sdk-crypto-wasm (without js-sdk linking)
---------

Co-authored-by: Timo <toger5@hotmail.de>
Co-authored-by: Timo <16718859+toger5@users.noreply.github.com>
Co-authored-by: Robin <robin@robin.town>

src/utils/matrix.ts

@@ -337,7 +337,7 @@ export function getRelativeRoomUrl(
 }
 
 /**
- * Perfom a network operation with retries on ConnectionError.
+ * Perform a network operation with retries on ConnectionError.
  * If the error is not retryable, or the max number of retries is reached, the error is rethrown.
  * Supports handling of matrix quotas.
  */

vite.config.js

@@ -5,13 +5,14 @@ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
 Please see LICENSE in the repository root for full details.
 */
 
-import { defineConfig, loadEnv } from "vite";
+import { defineConfig, loadEnv, searchForWorkspaceRoot } from "vite";
 import svgrPlugin from "vite-plugin-svgr";
 import { createHtmlPlugin } from "vite-plugin-html";
 import { codecovVitePlugin } from "@codecov/vite-plugin";
 import { sentryVitePlugin } from "@sentry/vite-plugin";
 import react from "@vitejs/plugin-react";
 import basicSsl from "@vitejs/plugin-basic-ssl";
+import { realpathSync } from "fs";
 
 // https://vitejs.dev/config/
 export default defineConfig(({ mode, packageType }) => {
@@ -64,9 +65,25 @@ export default defineConfig(({ mode, packageType }) => {
     );
   }
 
+  // The crypto WASM module is imported dynamically. Since it's common
+  // for developers to use a linked copy of matrix-js-sdk or Rust
+  // crypto (which could reside anywhere on their file system), Vite
+  // needs to be told to recognize it as a legitimate file access.
+  const allow = [searchForWorkspaceRoot(process.cwd())];
+  for (const path of [
+    "node_modules/matrix-js-sdk/node_modules/@matrix-org/matrix-sdk-crypto-wasm",
+    "node_modules/@matrix-org/matrix-sdk-crypto-wasm",
+  ]) {
+    try {
+      allow.push(realpathSync(path));
+    } catch {}
+  }
+  console.log("Allowed vite paths:", allow);
+
   return {
     server: {
       port: 3000,
+      fs: { allow },
     },
     build: {
       sourcemap: true,