arturovt
ca38305976
There's a short window where Angular can't send errors to ErrorHandler yet: while it's still building the root module or root component. It needs that root instance to look up the ErrorHandler you provided, so an error thrown before it exists just becomes a normal uncaught error instead. This mostly bites people using Angular elements, where a custom element tag already sitting in the page gets upgraded (and its component built) the moment you call customElements.define, which can happen very early. Added a short section to the error handling guide explaining why this happens and the usual ways around it: setTimeout, APP_BOOTSTRAP_LISTENER, or moving element registration to ngDoBootstrap. Fixes #29211
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