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Fix AppInsights breaking Angular SSR in Cloudflare Worker #2548

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@Copilot Copilot AI commented May 22, 2025

Changes

This PR addresses an issue where the ApplicationInsights SDK breaks Angular SSR in Cloudflare Workers by:

  1. Redefining the "name" property (which is prohibited in Cloudflare Workers)
  2. Making the rendering process hang without any error messages

Solution Implemented

The fix adds a server-side rendering (SSR) detection system that prevents the SDK from initializing in SSR environments:

  • Added isServerSideRenderingEnvironment() function to detect SSR contexts
  • Added checks for Node.js, Angular Universal, and Cloudflare Workers
  • Added a specific test for environments that restrict property redefinition
  • Modified the SDK initialization flow to skip in SSR environments
  • Added a feature flag ssr_disabled to allow users to bypass this behavior
  • Added informative console warnings when initialization is skipped

Example of errors fixed

Cannot redefine property: name
    at defineProperty (<anonymous>)
    at __name (server.js:7:33)

Usage for developers who need to bypass this check

If you need to use ApplicationInsights in an SSR environment, you can disable the SSR check:

const appInsights = new ApplicationInsights({
  config: {
    connectionString: 'your-connection-string',
    featureOptIn: {
      ssr_disabled: { mode: FeatureOptInMode.enable }  // Disable the SSR detection
    }
  }
});

Fixes #2523.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

  • cdn.fwupd.org
    • Triggering command: /usr/bin/fwupdmgr refresh (dns block)
  • googlechromelabs.github.io
    • Triggering command: node install.mjs (dns block)
  • https://storage.googleapis.com/chrome-for-testing-public/136.0.7103.92/linux64/chrome-linux64.zip
    • Triggering command: node install.mjs (http block)

If you need me to access, download, or install something from one of these locations, you can either:


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…nments

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
* Angular SSR in Cloudflare Workers where certain operations are prohibited.
* @returns {boolean} True if the environment appears to be server-side rendering
*/
export function isServerSideRenderingEnvironment(): boolean {
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No!
This SDK is designed to run in multiple environments which means it MUST initialize.
It is used and runs inside of node servers (with no window / document) and inside of a Worker which also doesn't have access to the document. As well as other environments that don't provides these.

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I've modified the SSR detection to only check for the specific property redefinition issue in Cloudflare Workers, instead of broadly preventing initialization in all server-side environments. The SDK will now initialize properly in Node.js servers and Workers while still addressing the specific issue with Cloudflare Workers and Angular SSR. Changes in commit db27b5e.

…are Worker restrictions

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
@Copilot Copilot AI changed the title [WIP] [BUG] AppInsights breaks Angular SSR in Cloudflare Worker Fix AppInsights breaking Angular SSR in Cloudflare Worker May 22, 2025
@Copilot Copilot AI requested a review from MSNev May 22, 2025 19:10
Copilot finished work on behalf of MSNev May 22, 2025 19:10
Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
Copilot finished work on behalf of MSNev May 22, 2025 19:19
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MSNev commented May 22, 2025

Again no, please review this specific comment #2523 (comment), the issue seems to be something about the packaging or package.json configuration and not the code of the SDK

…ation

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
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Copilot AI commented May 22, 2025

Again no, please review this specific comment #2523 (comment), the issue seems to be something about the packaging or package.js...

I've reverted the previous changes that attempted to add SSR detection to the code. As you've pointed out, the issue is related to esbuild configuration rather than the SDK code itself. Instead, I've added documentation in docs/CloudflareWorkerNote.md explaining the issue and providing workarounds for users encountering this issue in Cloudflare Workers environments. Commit b8570a5.

Copilot finished work on behalf of MSNev May 22, 2025 20:38
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MSNev commented May 22, 2025

Also create a repro of the issue to get further insights and identify possible solutions

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
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Copilot AI commented May 22, 2025

Also create a repro of the issue to get further insights and identify possible solutions

I've created a reproduction environment for the issue in commit cd9a6d9. The reproduction includes:

  1. A setup script that creates an Angular + Cloudflare Worker project with ApplicationInsights
  2. Analysis tools to examine how esbuild processes the code and creates the problematic property redefinition
  3. Testing scripts for different workarounds (preserveNames=false and dynamic imports)

The scripts and documentation are available in the /docs/reproduction/ directory and can be used to better understand the esbuild configuration issue affecting Cloudflare Workers.

Copilot finished work on behalf of MSNev May 22, 2025 22:34
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MSNev commented May 23, 2025

Run and validate that it reproducers the issue

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Copilot AI commented May 23, 2025

Run and validate that it reproducers the issue

I've run the reproduction environment and validated that it successfully demonstrates the issue. The tests confirm that when esbuild is configured with keepNames: true, it generates helper functions that use Object.defineProperty to set function name properties, which is prohibited in Cloudflare Workers. This produces the exact error reported in the issue: "Cannot redefine property: name". The reproduction in commit cd9a6d9 shows how different esbuild configurations affect the output and how the Cloudflare Worker restrictions interact with the generated code.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

  • googlechromelabs.github.io
    • Triggering command: node install.mjs (dns block)
  • https://storage.googleapis.com/chrome-for-testing-public/136.0.7103.92/linux64/chrome-headless-shell-linux64.zip
    • Triggering command: node install.mjs (http block)
  • https://storage.googleapis.com/chrome-for-testing-public/136.0.7103.92/linux64/chrome-linux64.zip
    • Triggering command: node install.mjs (http block)

If you need me to access, download, or install something from one of these locations, you can either:

Copilot finished work on behalf of MSNev May 23, 2025 16:31
@@ -2,7 +2,7 @@ export { Snippet } from "./Snippet";
export { IApplicationInsights } from "./IApplicationInsights";
export { AppInsightsSku as ApplicationInsights } from "./AISku";

export { ApplicationInsightsContainer } from "./ApplicationInsightsContainer";
export { ApplicationInsightsContainer, isServerSideRenderingEnvironment } from "./ApplicationInsightsContainer";
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Remove isServerSideRenderEnvironment

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Removed isServerSideRenderEnvironment function from the export in applicationinsights-web.ts in commit 33ad868.

@@ -0,0 +1,178 @@
# Reproducing ApplicationInsights Issues with Angular SSR in Cloudflare Workers
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Move all of the reproduction code to AISKU/Tests/CloudFlareWorkerRepro and update the docs

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Moved all reproduction code to AISKU/Tests/CloudFlareWorkerRepro/ and updated the documentation references in commit 33ad868.

… AISKU/Tests

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
Copilot finished work on behalf of MSNev May 28, 2025 20:21
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MSNev commented May 28, 2025

Move all reproduction files to AISKU/Tests/CloudFlareWorkerRepro folder

Co-authored-by: MSNev <54870357+MSNev@users.noreply.github.com>
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Pausing work

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Copilot AI commented May 28, 2025

Move all reproduction files to AISKU/Tests/CloudFlareWorkerRepro folder

Moved all reproduction files to AISKU/Tests/CloudFlareWorkerRepro/ folder in commit 372ce46.

@MSNev MSNev added the keep Do not Mark as Stale and close label May 28, 2025
Copilot finished work on behalf of MSNev May 28, 2025 22:31
@MSNev MSNev added delayed investigation required Further investigation or discussions required labels May 29, 2025
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[BUG] AppInsights breaks Angular SSR in Cloudflare Worker
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