use strict "vars" is great and makes me more comfortable when writing Perl code compared to when I'm writing PHP, Python, or Ruby.

However, since I utilize hashes a lot, typos made in the hash key literals that went undetected until runtime have at least one to several times bitten me.

What would be the closest thing we have in Perl/CPAN for something like (pseudo-/imagined code below)? 

my %hash1;
myhk @hash1{qw/foo bar baz/}; # define hash keys to use

say $hash{foo}; # ok, declared
say $hash{bah}; # compile-time error, undeclared
say $hash{$var}; # ok, not literal

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In reply to strict "vars" mode for hash key literals? by perlancar

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