Jan 17, 2017 · 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 . The ?? operator was added to TypeScript 3.7 back in November 2019. And more recently, the ?? operator was included in ES2020, which is supported by Node 14 (released in April 2020). 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 .
Jan 26, 2017 · I found the following in a TypeScript declaration file for Angular: interface IDirective{ compile?: (templateElement: IAugmentedJQuery, What does the ?: after compile do? The key aspect to interfaces in typescript that distinguish them from types is that they can be extended with new functionality after they've already been declared. In TypeScript, it's often really useful to use type guards, but when the type definition changes we get no warning from TypeScript that the type guard does not match the new criteria any more.
What does the ampersand (&) mean in a TypeScript type definition? Asked 9 years, 7 months ago Modified 1 year, 3 months ago Viewed 98k times
Typescript - Safe navigation operator (?.) or (!.) and null property.
I found the following in a TypeScript declaration file for Angular.
Interfaces vs Types in TypeScript - Stack Overflow.
- Newest 'typescript' Questions - Stack Overflow.
The "typescript support idea" topic is still evolving and should be monitored for confirmed changes.
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Sources
- https://stackoverflow.com/questions/15260732/does-typescript-support-the-operator-and-whats-it-called
- https://stackoverflow.com/questions/61480993/when-should-i-use-nullish-coalescing-vs-logical-or
- https://stackoverflow.com/questions/40238144/safe-navigation-operator-or-and-null-property-paths
- https://stackoverflow.com/questions/23557030/what-does-mean-in-typescript
