TSLint has this: https://palantir.github.io/tslint/rules/strict-boolean-expressi...

sciolistse on Nov 9, 2017 | parent | context | favorite | on: Ask HN: Which TypeScript codebase should I study t...

TSLint has this: https://palantir.github.io/tslint/rules/strict-boolean-expre...

It doesn't play well with the vscode tslint extension for some reason (doesn't show up at all) so you need to run tslint manually to see the errors.. but it's better than nothing.

recursive on Nov 9, 2017 [–]

But that also includes operands to !, so you wouldn't be able to use !! to bool-ify something.