Jul 20, 2019 · In JavaScript, it's commonly seen as best practice to use === instead of ==, for obvious and well-known reasons. In TypeScript, which is one to be preferred? Is there even …

Feb 2, 2019 · Alternatively, you can type name1 as string | undefined, and handle cases of undefined further down. However, it's typically better to handle unexpected errors earlier on. …

So by using the type guard, typescript now knows whether the is a or , so the corresponding APIs can be called without any design time linting errors. If it is "Super Critical" for that API to be …

Nov 5, 2015 · None of the other answers discuss how to run a TypeScript script that uses modules, and especially modern ES Modules. First off, ts-node doesn't work in that scenario, …

Jul 20, 2018 · 878 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 …

Aug 1, 2017 · Is there any operator like ?. in TypeScript that can check if the variable is null or not defined like Kotlin? Like person?.getName()?.firstName ?: "None"

Apr 24, 2018 · Note: Since TypeScript 2.9, you can use the --resolveJsonModule compiler flag to have TypeScript analyze imported .json files and provide correct information regarding their …

the operation a! produces a value of the type of a with null and undefined excluded Optional chaining finally made it to typescript (3.7) 🎉 The optional chaining operator ?. permits reading …

Is there a way to parse strings as JSON in TypeScript? For example in JavaScript, we can use JSON.parse(). Is there a similar function in TypeScript? I have a JSON object string as follows: …

Jan 20, 2013 · Learn how to perform type checks on interfaces in TypeScript and ensure compatibility between objects and their expected types.