You can also combine optional chaining with something called a nullish coalescing . Referensi objek dan menyalinnya. Description The optional chaining operator provides a way to simplify accessing values through connected objects when it's possible that a reference or function may be undefined or null . Add @babel/plugin-proposal-optional-chaining (https://git.io/vb4Sk) to the 'plugins' section of your Babel config to enable transformation. Vue-cli 3, babel polyfills and IE11 - Get Help - Vue Forum First, create a mini-project directory and install the dependencies we need. المتصفحات القديمه ربما تتطلب polyfills. (Instead, install @babel/cli or @babel/core .) The supported semantics of optional deletion is the only one that could be expected (provided that the semantics of the delete operator is correctly understood, of course). Abhishek Saxena - Medium The SWC CLI is designed to be a drop-in replacement for Babel: $ npx babel # old $ npx swc # new. in your chain. Optional Chaining (ES2020) Nullish Coalescing (ES2020) Class Fields and Static Properties (part . and nullish coalescing (? In fact, the only real reason is: "We didn't intend to support it.". In case of using a monorepo, you may want to call this file babel.config.json. 如果 JavaScript 引擎不支援 optional chaining (?.) 4.Optional Chaining Operator. The Optional Chaining Operator, "Modern" Browsers, and My Mom I'm not sure if Babel solves this to be honest. 红框中写着，Vite 只会做语法转译，不会包含 polyfills，那么究竟什么是 polyfills 和语法转译？ polyfills. GitHub is broken because of optional chaining (?.) 03 - Spread And Rest Operator. التسلسل الاختياري (غير الإجباري) - JavaScript Since the optional chaining will evaluate to undefined if any of the values are missing, we can pair that with our nullish coalescing . You then import the polyfill in your application's entry module: . Optional chaining is a browser-native way to chain methods or properties, and conditionally continue down the chain only if the value is not null or undefined. Optional chaining . Optional chaining '?.' và nullish coalescing operator '??' trong ...
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