Why use triple-equal (===) in TypeScript? - Stack Overflow
2019年7月20日 · TypeScript cannot redefine == without breaking all JavaScript code that relies on its behavior (despite this having sad implications for 3). This also implies that TypeScript …
Does Typescript support the ?. operator? (And, what's it called?)
2017年1月17日 · Yes. As of TypeScript 3.7 (released on November 5, 2019), this feature is supported and is called Optional Chaining: At its core, optional chaining lets us write code …
What does the `is` keyword do in typescript? - Stack Overflow
Typescript needs to know that the function into which you pass an object is functioning like a type guard. If it just returns type true or false, how can Typescript know that it's indeed a type guard …
How to test if two types are exactly the same - Stack Overflow
2018年12月17日 · Ah, the type-level equality operator as requested in microsoft/TypeScript#27024. @MattMcCutchen has come up with a solution, described in a …
typescript - 'unknown' vs. 'any' - Stack Overflow
2018年7月20日 · 872 TypeScript 3.0 introduces unknown type, according to their wiki: unknown is now a reserved type name, as it is now a built-in type. Depending on your intended use of …
What's the difference between 'extends' and 'implements' in …
What's the difference between 'extends' and 'implements' in TypeScript Asked 9 years ago Modified 1 year, 1 month ago Viewed 270k times
typescript - What does the "as" keyword do? - Stack Overflow
2019年4月21日 · The as keyword is a Type Assertion in TypeScript which tells the compiler to consider the object as another type than the type the compiler infers the object to be.
How can I generate a tsconfig.json file? - Stack Overflow
2016年4月28日 · How can I generate a tsconfig.json via the command line? I tried command tsc init, but this doesn't work.
typescript - How to get names of enum entries? - Stack Overflow
I would like to iterate a TypeScript enum object and get each enumerated symbol name, for example: enum myEnum { entry1, entry2 } for (var entry in myEnum) { // use entry's name …
TypeScript export vs. default export - Stack Overflow
2015年10月23日 · What is the difference in TypeScript between export and default export? In all the tutorials, I see people exporting their classes and I cannot compile my code if I don't add …