prerenderring - Angulartics2BaiduAnalytics ReferenceError: _hmt is not defined

[guoapeng]

For support questions, please consider using Gitter - Chat

I am submitting an issue that when I running the following command to prerender some pages ng run demo-angular-project:prerender:development,
I got the following exception:

 Build at: 2023-11-16T08:00:28.460Z - Hash: b945708904bd624f - Time: 78602ms
⠙ Prerendering 13 route(s) to D:\dev\proj\demo-angular-project\dist\demo-angular-web\browser...ReferenceError: _hmt is not defined
    at new Angulartics2BaiduAnalytics (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199481:12)
    at Object.Angulartics2BaiduAnalytics_Factory [as factory] (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199536:10)
    at D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134269:33
    at runInInjectorProfilerContext (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:125777:5)
    at R3Injector.hydrate (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134268:9)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134148:23)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134157:27)
    at ChainedInjector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:138783:32)
    at lookupTokenUsingModuleInjector (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129505:31)
    at getOrCreateInjectable (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129551:10)
✖ Prerendering routes to D:\dev\proj\demo-angular-project\dist\demo-angular-web\browser failed.
_hmt is not defined
Unhandled Promise rejection: _hmt is not defined ; Zone: <root> ; Task: Promise.then ; Value: ReferenceError: _hmt is not defined
    at new Angulartics2BaiduAnalytics (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199481:12)
    at Object.Angulartics2BaiduAnalytics_Factory [as factory] (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199536:10)
    at D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134269:33
    at runInInjectorProfilerContext (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:125777:5)
    at R3Injector.hydrate (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134268:9)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134148:23)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134157:27)
    at ChainedInjector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:138783:32)
    at lookupTokenUsingModuleInjector (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129505:31)
    at getOrCreateInjectable (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129551:10) ReferenceError: _hmt is not defined
    at new Angulartics2BaiduAnalytics (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199481:12)
    at Object.Angulartics2BaiduAnalytics_Factory [as factory] (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:199536:10)
    at D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134269:33
    at runInInjectorProfilerContext (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:125777:5)
    at R3Injector.hydrate (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134268:9)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134148:23)
    at R3Injector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:134157:27)
    at ChainedInjector.get (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:138783:32)
    at lookupTokenUsingModuleInjector (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129505:31)
    at getOrCreateInjectable (D:\dev\proj\demo-angular-project\dist\demo-angular-web\server\main.js:129551:10)

I think when prerendering a page on server side, it's initializing _hmt. which is meaningful. should we skip that if we can detect it's in prerendering process to make the libarary more robust.

• bug report

• feature request

• question about the decisions made in the repository

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

create an angular project and enableing angular universal and do preredering.

• What is the expected behavior?

don't throw error if there is no _hmt found in ssr process.

• What is the motivation / use case for changing the behavior?

to skip initialize Angulartics2BaiduAnalytics and do nothing during server side rendering.

• Environment:

please run the following and copy the output

./node_modules/.bin/ng --version

Angular CLI: 16.2.10
Node: 16.14.2
Package Manager: npm 8.5.0
OS: win32 x64

Angular: 16.2.10
... animations, cli, common, compiler, core, elements, forms
... platform-browser, platform-browser-dynamic, platform-server
... router, service-worker

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1602.10
@angular-devkit/build-angular   16.2.10
@angular-devkit/core            16.2.10
@angular-devkit/schematics      16.2.10
@angular/cdk                    16.2.12
@angular/compiler-cli           16.2.12
@angular/language-service       16.2.12
@angular/material               16.2.12
@nguniversal/builders           16.2.0
@nguniversal/express-engine     16.2.0
@schematics/angular             16.2.10
rxjs                            7.4.0
typescript                      5.1.6
zone.js                         0.13.3