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phpdave11
PHPStan is a great tool. In addition to PHPStan, I also use phpnsc (name space checker) to check for missing use statements, php-cs-fixer (code style fixer) to ensure the code adheres to my code style, phpcpd (copy paste detector) to detect duplicate code, and phpmd (mess detector) to find potential problems in the code. These are all set up in my CI pipeline so that my app will fail to build if any of these 5 tools detect a problem. It has saved me from deploying buggy code several times.
baybal2
Very helpful in the JS world, but I am afraid there is not standalone standard for static checks in JS.

There is typescript, but that's an entire new language to just partially cover the type checks.

bcherny
If you compile your code with TypeScript and set allowJs=true, you’ll get a lot of checking for free with no changes at all to your existing JS code. TS will catch things like dead code, missing return statements, type mismatches and so on for free.
baybal2
It will be nice if the use case of TS only being used as a static checker be supported better, but then there will be no point in TS as a language
oakesm9
If that's the use case you have, then Facebook's Flow is a better fit.
bcherny
What kind of additional support do you wish TS had, that it doesn’t have already?
xenorplxx
alternative to typescript would be facebook's flow.js, which works with 'normal' JS code
tru3_power
Fortify SCA supports js and typescript. I’ve been writing custom rules for it lately at work and have had great success with it. Expensive but powerful tool.