Make SubprocessError as an error instance

[LitoMore]

How about make the SubprocessError as an error instance instead of a type?

Currently it's a bit anonying when writing the error handling code in TypeScript:

try {
	await spawn(/* ... */);
} catch (error} {
	if (error instanceof Error && (error as SubprocessError).signalName === "SIGKILL") {
		// ...
	}
}

The code can be cleaner if we make the SubprocessError as an error instnace:

try {
	await spawn(/* ... */);
} catch (error} {
	if (error instanceof SubprocessError && error.signalName === "SIGKILL") {
		// ...
	}
}

Please correct me if there is a better way to write the code.

[ehmicky]

Hi @LitoMore,

Thanks for the suggestion.
It makes sense. 👍

[ehmicky]

Released with 0.2.0.