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Calling .unsubscribe()will NOT trigger completecallback! const sub = interval(1000).subscribe({ next: (val: any) => { counter.innerHTML = val; }, comp 阅读全文
posted @ 2022-10-18 21:09
Zhentiw
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Accessing object values and array members is MUCH more powerful in the type world than it is in the runtime world. Passing a union... RETURNS a union! 阅读全文
posted @ 2022-10-18 20:53
Zhentiw
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Implement the type version of lodash's _.flip. Type FlipArguments<T> requires function type T and returns a new function type which has the same retur 阅读全文
posted @ 2022-10-18 19:22
Zhentiw
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Implement the type version of Array.reverse For example: type a = Reverse<['a', 'b']> // ['b', 'a'] type b = Reverse<['a', 'b', 'c']> // ['c', 'b', 'a 阅读全文
posted @ 2022-10-18 19:12
Zhentiw
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Must have Configure Jest to Run Setup for All Tests with Jest setupFilesAfterEnv We want to include '@testing-library/jest-dom'so that we can have suc 阅读全文
posted @ 2022-10-18 13:59
Zhentiw
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This one little tip has saved me hours of refactoring time. Passing string | undefined instead of ?: string ensures that ALL call sites must be given 阅读全文
posted @ 2022-10-18 01:39
Zhentiw
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The "noUncheckedIndexedAccess" is the most awesome config option you've never heard of. It makes accessing objects a lot safer, and also powers up Typ 阅读全文
posted @ 2022-10-18 01:33
Zhentiw
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Mapping over a union type can feel tricky to conceptualise. But actually, TypeScript does it all for you - using Distributive Conditional Types. Here, 阅读全文
posted @ 2022-10-18 01:22
Zhentiw
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Globals in TypeScript?! 🤯 declare global is a super useful tool for when you want to allow types to cross module boundaries. Here, we create a Global 阅读全文
posted @ 2022-10-18 01:18
Zhentiw
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