enableProfiling() causes unclear dev mode errors. #62947
Description
Which @angular/* package(s) are the source of the bug?
core
Is this a regression?
No
Description
In a completely new Angular project (generated by ng new), I ran into the following problem.
Calling enableProfiling() causes vague errors to appear instead of helpful errors whenever something unexpected happens in a template.
main.ts:
import { bootstrapApplication } from '@angular/platform-browser';
import { appConfig } from './app/app.config';
import { App } from './app/app';
import { enableProfiling } from '@angular/core';
enableProfiling();
bootstrapApplication(App, appConfig)
.catch((err) => console.error(err));
app.html:
{{test.a.b}}
will cause the following error to appear:
ERROR Error: ASSERTION ERROR: Profiling error: expected to see 12 event but got 18 [Expected=> 12 == 18 <=Actual]
Removing enableProfiling() causes the error I would expect to re-appear
TypeError: Cannot read properties of undefined (reading 'b')
at App_Template (app.html:1:1)
at executeTemplate (debug_node.mjs:7935:9)
at refreshView (debug_node.mjs:8965:13)
at detectChangesInView (debug_node.mjs:9185:9)
at detectChangesInViewIfAttached (debug_node.mjs:9145:5)
at detectChangesInComponent (debug_node.mjs:9133:5)
at detectChangesInChildComponents (debug_node.mjs:9211:9)
at refreshView (debug_node.mjs:9020:13)
at detectChangesInView (debug_node.mjs:9185:9)
at detectChangesInViewWhileDirty (debug_node.mjs:8874:9)
Please provide a link to a minimal reproduction of the bug
No response
Please provide the exception or error you saw
ERROR Error: ASSERTION ERROR: Profiling error: expected to see 12 event but got 18 [Expected=> 12 == 18 <=Actual]
Please provide the environment you discovered this bug in (run ng version)
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/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
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Angular CLI: 20.1.4
Node: 24.3.0
Package Manager: npm 11.4.2
OS: win32 x64
Angular: 20.1.4
... build, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-server, router, ssr
Package Version
------------------------------------------------------
@angular-devkit/architect 0.2001.4
@angular-devkit/core 20.1.4
@angular-devkit/schematics 20.1.4
@schematics/angular 20.1.4
rxjs 7.8.2
typescript 5.8.3
Anything else?
No response