loose. Basic Features: Supported Browsers and Features | Next.js I was using esnext so that wasn't going to work. How to get optional chaining working in TypeScript? - Stack Overflow 80% Cleaner JavaScript Code Using Optional Chaining and Nullish Coalescing Optional chaining is a browser-native way to chain methods or properties, and conditionally continue down the chain if the value is not null or undefined. is undefined or null and returns undefined. We have to make sure the value for target in tsconfig results in transpiling that polyfills optional chaining. I have the same problem. This is a fair point, however I feel like the title should be "The Cost of Using A Babel's Polyfill for Optional Chaining", as this really isn't about the cost of the concept of optional chaining itself. Optional chaining was introduced in ES2020. after optional chaining to provide a default value. Source: MDN Optional Chaining Page However, you should be aware it was a relative recent addition, for example Chrome 80 was only released in February 2020, so if you do use Optional Chaining in a web-environment make sure you got your potential polyfill set up correctly with babel. 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. The Optional Chaining Operator, "Modern" Browsers, and My Mom babel-loader | webpack 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. Polyfill only stable core-js features - ES and web standards. As usual with babel plugins, the primary reason was developer experience: "It will make our . Polyfill dan transpiler. I'm not sure if Babel solves this to be honest. If you take a look at @babel/plugin-proposal-optional-chaining, this is how babel will transpile it. In fact, the only real reason is: "We didn't intend to support it.". stops the evaluation if the value before ?. Using Babel to transpile and polyfill. Solved babel eslint Support Optional Chaining 15 - Minesweeper Project - Web Dev Simplified For TS 3.8.3 you have to set ES2019 as a target - Nikita Cherednichenko . For the rest of us just update tsconfig.json . V8's V8: Optional Chaining and Nullish Coalescing in JavaScript
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