[Release] Increase version to 15.4.0 (using Application Insights 3.4.1) (#248)

* [Release] Increase version to 15.4.0 (using Application Insights 3.4.1)

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update RELEASES.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: MSNev

.github/workflows/angular.yml

@@ -24,5 +24,8 @@ jobs:
           with:
               node-version: ${{ matrix.node-version }}
         - run: npm install
+        - name: Set CHROME_BIN to Puppeteer's bundled Chromium
+          run: echo "CHROME_BIN=$(node -e 'process.stdout.write(require("puppeteer").executablePath())')" >> $GITHUB_ENV
         - run: npm run build
-        - run: npm run test
+        - name: Run tests (print Angular error log on failure)
+          run: npm run test || { echo "=== angular-errors.log ==="; cat /tmp/ng-*/angular-errors.log 2>/dev/null || true; exit 1; }

README.md

@@ -153,7 +153,8 @@ Additionally, as part of this change the existing v3.x extension has been moved
 
 | Version |  Application Insights | Angular              | Branch
 |---------|-----------------------|----------------------|-----------
-| 15.3.7  | ^3.3.10                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
+| 15.4.0  | ^3.4.1                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
+| 15.3.8  | ^3.3.10               | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 15.3.7  | ^3.3.9                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 15.3.6  | ^3.3.6                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 15.3.5  | ^3.3.5                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
@@ -171,7 +172,7 @@ Additionally, as part of this change the existing v3.x extension has been moved
 | 15.0.0  | ^3.0.3                | peer: ^15.2.9        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 14.0.0  | ^3.0.3                | peer: ^14.0.3        | [Angular14](https://github.com/microsoft/applicationinsights-angularplugin-js/tree/Angular14) (Angular v14 support is moved to branch Angular14 since Sep. 2023)
 | 3.0.3   | ^2.8.14               | peer: ^14.0.3        | [release3.x](https://github.com/microsoft/applicationinsights-angularplugin-js/tree/release3.x)
-| 3.0.2   | ^2.8.12               | peer: ^14.0.3        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
+| 3.0.2   | ^2.8.14               | peer: ^14.0.3        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 3.0.1   | ^2.8.10               | peer: ^14.0.3        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 3.0.0   | ^2.8.5                | peer: ^14.0.3        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js)
 | 2.9.2   | ^2.8.5                | peer: ^13.0.3        | [main](https://github.com/microsoft/applicationinsights-angularplugin-js) (Angular v13 support archived to [Angular13](https://github.com/microsoft/applicationinsights-angularplugin-js/tree/Angular13) branch)

RELEASES.md

@@ -1,5 +1,47 @@
 # Releases
 
+## 15.4.0 (April 8th, 2026)
+
+### Potential Breaking Changes (from @microsoft/applicationinsights-web v3.4.1)
+
+This release bumps the Application Insights dependency from ^3.3.10 to ^3.4.1. The 3.4.x release of Application Insights includes significant changes that may affect your application. Please review the following before upgrading.
+
+This version is NOT supported on any earlier versions of Application Insights.
+
+#### Package Deprecation
+
+The following packages have been merged into `@microsoft/applicationinsights-core-js` and are now deprecated. They continue to be published as backward-compatible shims (re-exporting from Core) so existing code will not break, but you should migrate to importing from `@microsoft/applicationinsights-core-js` directly:
+
+- **`@microsoft/applicationinsights-common`** — All exports have been merged into `@microsoft/applicationinsights-core-js`. The package is now a compatibility shim. See the [Migration Guide](https://github.com/microsoft/ApplicationInsights-JS/blob/main/docs/upgrade/MergeCommonToCore.md) for details. This package will be removed in a future major release (4.0.0).
+- **`@microsoft/1ds-core-js`** — All exports have been merged into `@microsoft/applicationinsights-core-js`. See the [1DS Core Migration Guide](https://github.com/microsoft/ApplicationInsights-JS/blob/main/shared/1ds-core-js/README.md) for migration steps. This package will be removed in a future major release (4.0.0).
+
+#### Interface Changes
+
+- The `IDistributedTraceContext` interface has been significantly expanded to include W3C trace state management capabilities, which may affect custom telemetry processors that interact with distributed tracing context.
+- The `TelemetryTrace` class has been removed. The `telemetryTrace` property is now an adapter to the existing `core.getTraceCtx()` value and is marked as deprecated.
+- The internal `ajaxRecord` class has been removed from `@microsoft/applicationinsights-dependencies-js` and replaced with the `IAjaxRecordData` interface.
+- The `flush` method parameter was renamed from `async` to `isAsync` in the `IChannelControls` interface.
+
+#### Significant New Features in Application Insights 3.4.1
+
+- W3C Trace State support with new distributed tracing modes (`AI_AND_W3C_TRACE`, `W3C_TRACE`)
+- OpenTelemetry integration preparation with foundational interfaces
+- Enhanced cookie management with in-memory caching when cookies are disabled
+
+For full details see the [Application Insights JS 3.4.1 release notes](https://github.com/microsoft/ApplicationInsights-JS/blob/main/RELEASES.md#341-april-7th-2026).
+
+### Changelog
+
+- Update to Application Insights ^3.4.1
+- [#123](https://github.com/microsoft/applicationinsights-angularplugin-js/issues/123) v3.0.2 (next: ITelemetryPluginChain | ITelemetryPlugin) => void' is not assignable to type '(next: ITelemetryPlugin | ITelemetryPluginChain) => void'
+- #238 Bump flatted from 3.2.9 to 3.4.2
+- #240 Bump lodash in /sample/applicationinsights-angularplugin-sample
+- #241 Bump lodash from 4.17.21 to 4.18.1
+- #226 Fix vulnerable dependencies
+- #212 Bump on-headers and compression
+- Update dependency overrides to address known security vulnerabilities (tar, serialize-javascript, basic-ftp)
+
+
 ## 15.3.7 (Sept 24th, 2025)
 
 ### Changelog