I want to use a polyfill for optional chaining but I do not want to provide a polyfill for browsers which already support this feature. In this case, you should add a top-level import for the specific polyfill you need in your Custom or the individual component. PolyFill - SideFX Let’s understand it in more detail. Support for Vue-CLI, Nuxt.js, Webpack, vue-jest, any environment use vue-loader. 这里的 ES6 指 ES2015，因为当时还没有正式发布， ES2015 的名字还未被正式确定. #palemoon #pale-moon #Github #Webcomponents #Polyfill. This is a method I copied from Philip Walton's blog post. es una forma a prueba de errores para acceder a las propiedades anidadas de los objetos, incluso si no existe una propiedad intermedia. Usage. Help to translate the content of this tutorial to your language! CrocosAPI provides information about all the crocodiles in the world … 如果 JavaScript 引擎不支援 optional chaining (?.) Rollup can be used either through a command line interface with an optional configuration file, or else through its JavaScript API. let myMap = new Map(); myMap.set("foo", {name: "baz", desc: "inga"}); let nameBar = myMap.get("bar")?.name; If not, the application fetches the polyfills with a GET request from Polyfill.io. @babel/plugin-syntax-optional-chaining Sounds like a good solution to the posted problem. JavaScript Language Features. @babel/plugin-proposal-optional-chaining. The optional chaining operator in vanilla JS | Go Make Things must be declared ️( cannot be used on a non-declared root object , but can be used with an undefined root object) @babel/plugin-proposal-optional-chaining. Optional chaining The optional chaining ?. 。. ), Nullish Coalescing(??) optional chaining undeclared variable Code Example : app.utils.clamp) There is also a proposal for a built in Math.clamp function, however, it is still in draft. Polyfill only stable core-js features - ES and web standards. Our great sponsors. A transpiler is a special piece of software that translates one source code to another source code. inputAutoTrim true Migrating from Babel – SWC

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