Implement RemoteView #1

OliverGilan · 2025-12-15T18:11:12Z

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Performed full review of 4361e9a...3e7ea11

Analysis

State Management Race Conditions: The RemoteViewProvider implementation contains stale closure bugs in its error handling logic that could lead to lost errors or inconsistent application state.
Package Publishing Configuration: Critical build/publish configuration problems exist, including incorrect main field pointing to TypeScript source instead of compiled JavaScript, missing required package.json fields, and dependency management inconsistencies.
Security Model Weaknesses: Dynamic imports and CSS injection rely on documentation/comments about trusted sources rather than implementing runtime validation, creating potential security vulnerabilities.
Memory Management Issues: No mechanism exists to track or clean up injected CSS stylesheets, potentially leading to memory leaks in long-running applications.
Error Recovery Limitations: The system lacks built-in functionality for retrying failed loads without completely remounting the provider component.

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mesa-dot-dev · 2025-12-15T18:50:34Z

packages/remote-view/src/components/remote-view-provider.tsx

+          LoadedView && setViews((prev) => ({ ...prev, [url]: LoadedView }));
+        })
+        .catch((err: Error) => {
+          setErrors({ ...errors, [url]: err });


This creates a stale closure bug. When the async catch block executes, it uses an outdated version of the errors state. This can cause errors to be overwritten or lost. Use functional state update: setErrors(prev => ({ ...prev, [url]: err })) to ensure you're working with the latest error state.

Agent: 🖇️ Modular • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/src/components/remote-view-provider.tsx#L112 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: This creates a stale closure bug. When the async catch block executes, it uses an outdated version of the `errors` state. This can cause errors to be overwritten or lost. Use functional state update: `setErrors(prev => ({ ...prev, [url]: err }))` to ensure you're working with the latest error state.

mesa-dot-dev · 2025-12-15T18:50:35Z

packages/remote-view/package.json

+  "modular": {
+    "type": "package"
+  },
+  "main": "./src/index.ts",


The main field points to TypeScript source file ./src/index.ts, but this package is marked as public and will be published. Published packages should point to built JavaScript files, not TypeScript source. This will cause runtime errors for consumers. Change to point to built output like ./dist/index.js or ./lib/index.js.

Agent: 🔨 Modular tooling • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/package.json#L7 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: The `main` field points to TypeScript source file `./src/index.ts`, but this package is marked as public and will be published. Published packages should point to built JavaScript files, not TypeScript source. This will cause runtime errors for consumers. Change to point to built output like `./dist/index.js` or `./lib/index.js`.

mesa-dot-dev · 2025-12-15T18:50:36Z

packages/remote-view/src/hooks/useRemoteView.tsx

+  const currentView = views[baseUrl];
+
+  if (remoteViewError) {
+    throw new RemoteViewError(remoteViewError.message, baseUrl);


Creating a new RemoteViewError instance instead of re-throwing the existing error loses the original error context and stack trace. Consider re-throwing the existing error: throw remoteViewError to preserve debugging information.

Agent: 🖇️ Modular • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/src/hooks/useRemoteView.tsx#L14 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: Creating a new RemoteViewError instance instead of re-throwing the existing error loses the original error context and stack trace. Consider re-throwing the existing error: `throw remoteViewError` to preserve debugging information.

mesa-dot-dev · 2025-12-15T18:50:37Z

package.json

    "modular": "ts-node packages/modular-scripts/src/cli.ts",
    "test": "yarn modular test --watchAll false --runInBand --env node",
-    "build": "yarn workspace @modular-scripts/workspace-resolver build && yarn workspace create-modular-react-app build && yarn workspace modular-scripts build && yarn workspace modular-views.macro build",
+    "build": "yarn workspace @modular-scripts/workspace-resolver build && yarn workspace create-modular-react-app build && yarn workspace modular-scripts build && yarn workspace modular-views.macro build && yarn modular build @modular-scripts/remote-view",


The build script adds yarn modular build @modular-scripts/remote-view but the remote-view package doesn't have proper build configuration in its package.json. Since remote-view's main field points to source TypeScript files, this build command may not produce the expected built artifacts needed for publishing.

Agent: 🔨 Modular tooling • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: package.json#L18 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: The build script adds `yarn modular build @modular-scripts/remote-view` but the remote-view package doesn't have proper build configuration in its package.json. Since remote-view's main field points to source TypeScript files, this build command may not produce the expected built artifacts needed for publishing.

mesa-dot-dev · 2025-12-15T18:50:38Z

packages/remote-view-demos/package.json

+  },
+  "version": "0.0.0",
+  "dependencies": {
+    "@modular-scripts/remote-view": "*",


The dependency @modular-scripts/remote-view uses a wildcard version * which is problematic. Since this is an internal workspace dependency, it should use the workspace protocol: workspace:* to ensure it resolves to the local workspace package during development.

Agent: 🔨 Modular tooling • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view-demos/package.json#L10 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: The dependency `@modular-scripts/remote-view` uses a wildcard version `*` which is problematic. Since this is an internal workspace dependency, it should use the workspace protocol: `workspace:*` to ensure it resolves to the local workspace package during development.

mesa-dot-dev · 2025-12-15T18:50:39Z

packages/remote-view/src/components/remote-view.tsx

+  const ViewComponent = useRemoteView(url);
+  const loadingOutput = loading ? loading : <DefaultLoading />;
+
+  return (ViewComponent && <ViewComponent />) || loadingOutput;


The conditional rendering (ViewComponent && <ViewComponent />) || loadingOutput could be clearer. Consider using an explicit ternary operator: ViewComponent ? <ViewComponent /> : loadingOutput for better readability and intent.

Agent: 🖇️ Modular • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/src/components/remote-view.tsx#L17 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: The conditional rendering `(ViewComponent && <ViewComponent />) || loadingOutput` could be clearer. Consider using an explicit ternary operator: `ViewComponent ? <ViewComponent /> : loadingOutput` for better readability and intent.

mesa-dot-dev · 2025-12-15T18:50:40Z

packages/remote-view/src/__tests__/serve.js

+
+// Create server
+const server = http.createServer(function onRequest(req, res) {
+  res.setHeader('Access-Control-Allow-Origin', '*');


The CORS configuration allows any domain (*) to access this test server. While acceptable for local testing, ensure this pattern isn't used in production. Production remote view servers should restrict CORS to specific trusted origins to prevent security issues.

Agent: 🔨 Modular tooling • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/src/__tests__/serve.js#L23 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: The CORS configuration allows any domain (`*`) to access this test server. While acceptable for local testing, ensure this pattern isn't used in production. Production remote view servers should restrict CORS to specific trusted origins to prevent security issues.

mesa-dot-dev · 2025-12-15T18:50:41Z

packages/remote-view/src/components/remote-view-error-boundary.tsx

+    this.state = { error: undefined, isRemoteViewError: undefined };
+  }
+
+  componentDidCatch(


Consider implementing static getDerivedStateFromError for state updates and keeping componentDidCatch only for logging, following React's recommended error boundary pattern. This separates concerns and ensures state updates happen at the right time in the component lifecycle.

Agent: 🖇️ Modular • •

Prompt for Agent

Task: Address review feedback left on GitHub. Repository: mesa-dot-dev/modular#1 File: packages/remote-view/src/components/remote-view-error-boundary.tsx#L25 Action: Open this file location in your editor, inspect the highlighted code, and resolve the issue described below. Feedback: Consider implementing `static getDerivedStateFromError` for state updates and keeping `componentDidCatch` only for logging, following React's recommended error boundary pattern. This separates concerns and ensures state updates happen at the right time in the component lifecycle.

Implement RemoteView (jpmorganchase#2284)

3e7ea11

OliverGilan force-pushed the main branch from e961552 to 4361e9a Compare December 15, 2025 18:11

OliverGilan marked this pull request as ready for review December 15, 2025 18:33

mesa-dot-dev bot reviewed Dec 15, 2025

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