err instanceof Error ? 'shortMessage' in err ? err.shortMessage

[rancid bolt]

adraffy#0

Playground Link

Preview:ts try { throw new Error() } catch (err) { const s: string = err instanceof Error ? "shortMessage" in err ? err.message : err.message : String(err) }

You can choose specific lines to embed by selecting them before copying the link.

[formal aurora]

playground 5.8.2 shows no error

vscode 5.8.2 shows type error

seems like vscode is propagating the wrong type, shown in the tooltip

[wintry nova]

what's your tsconfig?

[meager widget]

Also are there any modifications to the Error type in your environment?

Oh, no, wait it fails in the playground too the code is just wrong - the playground had err.message on both branches

[rancid bolt]

retsam19#0

Playground Link

Preview:ts try { throw new Error() } catch (err) { const s: string = err instanceof Error ? "shortMessage" in err ? err.shortMessage : err.message : String(err) }

You can choose specific lines to embed by selecting them before copying the link.

[wintry nova]

ah

[meager widget]

AFAICT shortMessage is not a property on Errors, you're checking that the property exists "shortMessage" in err, but you're not checking that it's a string.

[wintry nova]

you can add another check to solve that

[rancid bolt]

that_guy977#0

Playground Link

Preview:ts try { throw new Error() } catch (err) { const s: string = err instanceof Error ? "shortMessage" in err && typeof err.shortMessage === "string" ? err.shortMessage : err.message : String(err) }

You can choose specific lines to embed by selecting them before copying the link.

[formal aurora]

ok yeah brainfart, the shortMessage type is unknown