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Confusing error message for labels used before definition #30408
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[-]Invalid "TS1007: Jump target cannot cross function boundary error" error in TS 3.3[/-][+]Confusing error message for labels used before definition[/+]on Mar 14, 2019 Did you try adding3s to the version to see if the error gets better?Seems like a reasonable request.
Reacted by Josh Ghoulberg 👻Here's a better message for this specific case, where the containing function of the label reference is the same as that of the labeled statement:
A label cannot be referenced prior to its declared location.To find if it's applicable, walk up each scope until the first functionlike (
isFunctionLike) or classlike (isClassLike) declaration and look for LabelledStatements in that scope.We can also provide a related span. We already have a diagnostic for
{0} is declared here.- ?????? Get Outlook for Android<https://aka.ms/ghei36>…________________________________ From: Daniel Rosenwasser <notifications@github.com> Sent: Thursday, March 14, 2019 6:41:32 PM To: Microsoft/TypeScript Cc: Paul van Brenk; Author Subject: Re: [Microsoft/TypeScript] Confusing error message for labels used before definition (#30408) Here's a better message for this specific case. A label cannot be referenced prior to its declared location. We also should provide a related span. We already have a diagnostic for {0} is declared here. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#30408 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AFB5dwK9ovsiqwXTAzc2LlmDu5_corNoks5vWtAcgaJpZM4b1HbC>.
Actually, we already have a better message for
breakorcontinueerror messages.- In 3.4? Get Outlook for Android<https://aka.ms/ghei36>…________________________________ From: Daniel Rosenwasser <notifications@github.com> Sent: Thursday, March 14, 2019 8:13:58 PM To: Microsoft/TypeScript Cc: Paul van Brenk; Author Subject: Re: [Microsoft/TypeScript] Confusing error message for labels used before definition (#30408) Actually, we already have a better message for break or continue error messages. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub<#30408 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AFB5d5sWoEtjlpcsCEz1AA8hP80x1ghKks5vWuXGgaJpZM4b1HbC>.
Hey -- is this still something that should be implemented? Happy to make changes now if no one else is already
Yes, please. This is still an issue in @next
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I can take this on, I have a fix for it. Please assign me.
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on Mar 26, 2026 - added a commit that references this issue
on Apr 6, 2026 I encountered a similar issue.
setTimeout(() => { outerLoop: for(let i = 0; i < 3; i++) { break outerloop; // typo, "l" should be uppercase } });
In this case the label does not exist, but I still get the error "TS1107: Jump target cannot cross function boundary."
The problem still exists in version
7.0.0-dev.20260415.1(withtsgo).I'd like to take this one — I'll follow up with a PR. (claiming via Stella (@LeonxLJX))
Hi! I'd like to improve the 'label used before definition' error message. Plan: reproduce, refine the message, add tests. May I be assigned?
Hey, i would like to work on this. Can i be assigned this issue?
Opening another PR for this issue without acknowledging that you're doing it - and what you're doing differently than the last seven - will be per se evidence of automated behavior and result in an immediate ban.
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on Sep 28, 2026
The following gives me an unexpected "TS1007: Jump target cannot cross function boundary error" in TS 3.3.33333
Further investigation... you can jump to the start of the loop, so the error I would argue is that the error message is confusing.
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