For TS 3.8.3 you have to set ES2019 as a target - Nikita Cherednichenko . Is the usage of optional chaining beneficial? . must be declared ️( cannot be used on a non-declared root object , but can be used with an undefined root object) Optional chaining thường được sử dụng khi chúng ta fetching data từ API, khi mà chúng ta không thể chắc . GitHub is broken because of optional chaining (?.) GitHub is broken because of optional chaining (?.) Looks like optional chaining has landed. Babel - Better Programming With our Nullish Coalescing operator we can remove the entire need to use a ternary. Polyfill dan transpiler. To fix this, you should uninstall the npm package babel, as it is deprecated in Babel v6. The "non-existing property" problem If you've just started to read the tutorial and learn JavaScript, maybe the problem hasn't touched you yet, but it's quite common. GitHub - tc39/proposal-optional-chaining Using pretty much any polyfill is going to decrease your performance and create a much larger bundle size. It uses the new standardized format for code modules included in the ES6 revision of JavaScript, instead of previous idiosyncratic solutions such as CommonJS and AMD. Optional Chaining (ES2020) Nullish Coalescing (ES2020) Class Fields and Static Properties (part . 8 new JavaScript features you might have missed | InfoWorld Key takeaways. polyfills 是通过在低版本浏览器中模拟等效的代码，来实现高版本语法的行为. false: Do not use a preset (you will need to add your own imports to the top of your entry point). - icl7126. JS Optional Chaining Polyfill? : webdev - reddit 今回紹介したES2020の新機能のうち、個人的にはOptional Chaining、Nullish coalescing Operator、import()、Promise.allSettled()がとても便利に感じます。新機能はこれまで面倒だった処理を簡潔にしてくれる効果があるので、積極的にキャッチアップしていきましょう。 If I am unable to access the property name from the response object, due to optional chaining, the name will have the default property Todd thanks to . 53. It is not like it could in some manner confuse the programmer. Switched to es2016 and Parcel no longer complained. It's going to be really verbose in your bundles. Does anyone know of a polyfill for unsupported browsers, specifically mobile browsers and Safari? If you take a look at @babel/plugin-proposal-optional-chaining, this is how babel will transpile it. The optional chaining ?. Optional chaining is a useful feature that can help you write cleaner code. V8's V8: Optional Chaining and Nullish Coalescing in JavaScript Compilers/polyfills Desktop browsers Servers/runtimes Mobile; Feature name Current browser Traceur Babel 6 + core-js 2 Babel 7 + core-js 2 Babel 7 + core-js 3 Closure 2020.03 Closure 2020.05 Closure 2020.06 Closure 2020.09 Closure 2021.08 Closure 2021.09 Closure 2021.10 Closure 2021.11 Type-Script + core-js 2 Type-Script + core-js 2 Type-Script . The costs of Optional Chaining. - DEV Community
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