he/him 
After using TypeScript there's some features that I'm terrified of that seem counter intuitive. All the following examples produce NO errors and are with every single strict TS option enabled.
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I found out recently that TS types are nullable by default unless you enable the `strictNullChecks` option. e.g. this is a completely valid TS program by default, but will crash immediately. Seems... bad.pic.twitter.com/v3nMGKubwH
Yeah it's really weird. I think that one is forgiveable because at least it's an option and the `strict` option is what seems to be the community recommended default tsconfig.
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This is because of backwards compatibility with TS 1.x which didn't have type narrowing. So if (!myVar) { myVar.whatever } would fail telling you myVar could be undefined. Adding strict mode to old codebase was hard work, so was opt in
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