Webpack optional chaining unexpected token json which shows the module. 3. Feb 19, 2024 · I added a webpack. optional chaining. js-files through Babel first, using this Babel plugin wait for the This plugin is included in @babel/preset-env, in ES2020 Optional chaining was added in ES2020, which isn't supported by the node. js yet. Optional Chaining does not work in webpack 4 #370 Closed 2 tasks bnainar opened this issue on May 4 · 2 comments Apr 27, 2021 · Optional-chaining entered not so long time ago , and Webpack (which depends on it) supports it only since ver. ts Test suite failed to run GenericFailure: failed to process js file Caused by: failed to parse module Feb 11, 2020 · Nullish coalescing support was added in 575ba80 on 5th April 2020, available as-of v4. 13. We’re now using owl-carousel instead as we couldn’t get past the unexpected token issue. May 11, 2020 · Handling undefined or null with ? throws SyntaxError: Unexpected token using webpack Asked4 years, 11 months ago Modified 4 years, 11 months ago Viewed 280 times 0 Jul 21, 2017 · Uncaught SyntaxError: Unexpected token < inline. May 23, 2022 · Module parse failed: Unexpected token when transpiling with webpack due to inclusion of TypeScript optional chaining operator (submitter?. 0 release from 3 days ago. 7 features like Optional Chaining, Nullish Coalescing. Aug 17, 2021 · Hello 🙂 I am facing errors when i try to use ? or ?? operators with Ionic Vue (Typescript) Examples: user?. ' optional chaining in my project I get the following compiler error: Module parse failed: Unexpected token (8:36) ということは、どうやら期待されていないトークンに遭遇したらしい。 次に、 const gl = canvas. or added the @babel/plugin-proposal-optional-chaining When running yarn storybook --webpack-debug, it seems optional chaining is enabled for . Jul 31, 2019 · Sean Larkin is an award winning public speaker, giving talks all over the world on webpack, JavaScript, and web perf. getContext("webgl"); という、ソースコードの場所を明示してくれている。 で、webpackというヤツはルールに従ってloaderがバケツリレーをしながら javascript に置き換える May 8, 2020 · but in Nuxt . json target: "ESNext" TS keeps my code with optional chaining (and nullish coalescing) as is. 5, still in beta). 0 Global ESLint version:9. Feb 10, 2025 · JavaScript Language Features: When using newer language features such as optional chaining or nullish coalescing without proper configurations or support from ESLint, parsing errors can occur. Nov 7, 2019 · Edit: There is nothing wrong with optional chaining, the feature is related to idiomatic absence valu Tagged with typescript, javascript, webdev, functional. You can use optional chaining when attempting to call a method which may not exist. Feb 1, 2022 · When I use the '?. 0 Operating System:Windows 11 x64 What parser are you using? Default (Espree) What did you Apr 8, 2021 · The issue is, that in some version after 2. Feb 9, 2023 · 以上的方法可以解决在script区域可选链式运算符报错的问题，template的不能解决。 研究发现是可选链式运算符是2020年新出的语法，vue2的template编译器vue-template-compiler还不支持这一功能，vue3应该支持了。但我发现使用vue2的脚手架的项目，template可编译成功。其项目配置如下： 网上的解决办法： (3条 Dec 11, 2024 · Description I encountered an issue when using the latest version of axios-retry in a project created with Create React App (CRA). green, optional chaining will be supported starting with Node 14, but will still require the --harmony flag. /cypress/integration/sandbox. Jun 14, 2013 · You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. 5 some lines with the optional chaining operator were added. 18 questions with no answers format tailwind-css modified Feb 5 at 11:43 typescript shadcnui optional-chaining asked Sep 3, 2024 at 12:08 modified Jun 18, 2024 at 7:44 modified Jul 20, 2023 at 11:53 Feb 7, 2020 · Technically, to support such syntaxes in Vue 2, we need to: tweak the codegen to not modify such expressions (currently it converts obj?. This can be helpful, for example, when using an API in which a method might be unavailable, either due to the age of the implementation or because of a feature which isn't available on the user's device. If your app is created by vue cli 4 also, you can follow my steps: The Problem is caused by Optional chaining, so we can install babel plugins about Optional chaining, And I also install plugin about Nullish coalescing operator. Jun 15, 2021 · After upgrading to Webpack 5 I started to see this error while starting the serve of Webpack. 5 from node_modules. Issue : I just upgraded a repo to use Typescript 3. Errors: Module parse failed: Unexpected token … You may need an additional loader to handle the result of these Mar 14, 2023 · The reason why optional chaining did not make sense (i. a) vue-template Aug 23, 2021 · The problem is not caused by any loader but directly by Webpack 4. ModuleParseError: Module parse failed: Unexpected token (65:45) File was processed with these loa Apr 3, 2024 · I have included the plugin for optional chaining in babel and am now attempting to upgrade webpack to v5 to see if that causes anything to change. However, when I compile the project, I get this error: pri How do I fix the 'Unexpected token ?' error in webpack-cli when bundling Firebase modules? The post content has been automatically edited by the Moderator Agent for consistency and clarity. I am confident it is because of the optional chaining used in this node module file. 0 fails under webpack 4: Module parse failed: Unexpected token #592 Aug 8, 2023 · Module parse failed: Unexpected token (78:32) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. ERROR Failed to compile w Aug 16, 2022 · Module parse failed: Unexpected token (161360:6) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. After updating the configuration, clear the cache, reinstall dependencies, and run the build again. There is a pending pull request which you can subscribe to to get notified about the progress. svelte 13:23 Module parse failed: Unexpected token Oct 29, 2022 · Optional chaining was working fine until I installed the capacitor/push-notification plugin. 0) and babel-loader (9. And note, rolling back to a know good commit doesn't resolve the issue. Jan 22, 2021 · ERROR #98123 WEBPACK: Generating development JavaScript bundle failed - unexpected token Asked 4 years, 3 months ago Modified 4 years, 3 months ago Viewed 2k times Jun 14, 2023 · The “Unexpected Token” error can also occur due to a syntax error or using an unsupported language feature in your code. config. This issue can occur when using optional chaining or type guards in your code. 0 Google Chrome was used to ensure async, let, const, classes, and ?? support. js:1 Uncaught SyntaxError: Unexpected token < vendor. Aug 27, 2021 · For some reason optional chaining isn't working even though I'm using the Node 14 LTS. I found that optional chaining and null-coalescing are supported out of box in webpack higher than 5 ver, but I'm limited with Angular 9 and cannot update it to higher version to load build-angular and as dependency, webpack to higher version. It collects links to all the places you might be looking at while hunting down a tough bug. 7 to test out optional chaining. 场景：我们正在使用webpack 4从我们的Javascript源代码创建捆绑包。我们不使用Babel，因为我们只为单个平台（最新的Chrome）编写，并且我们仅使用直接可用于Chrome的功How to make webpack accept optional chaining without babel Jest cannot understand token "?" from @babel/plugin-proposal-optional-chaining #8973 Oct 9, 2021 · Figured it out: I had placed webpack. Current Behavior webpack error: Module build failed: SyntaxError: Unexpected token (9:2) Answer by Kamryn Phillips Add @babel/plugin-proposal-optional-chaining and @babel/plugin-proposal-nullish-coalescing-operator plugins in your config,Description When I set in tsconfig. Optional chaining was added in ES2020, which isn't supported by the node. The progress to webpack 5 can be tracked here. Oct 4, 2023 · Module parse failed: Unexpected token (179:46) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. May 3, 2021 · giancarlosisasi changed the title Webpack 5: "Module parse failed: Unexpected token" to import JSON file Webpack 5: "Module parse failed: Unexpected token" when importing JSON file on May 2, 2021 [optional-chaining] Optional chaining is a process for querying and calling properties, methods, and subscripts on an optional that might currently be nil/null . /src/app. I've updated the react-monaco-editor mock to look like this Apr 9, 2023 · Describe the bug A clear and concise description of what the bug is. quasar (Vue v2) app for more than a year. May 17, 2014 · Hi, our project is made with webpack 4 + babel 7 and we use swagger-ui@3. Error: Webpack Compilation Error . Jun 11, 2018 · Error parsing code: Unexpected token interface #271 Closed Kezino opened this issue on Jun 11, 2018 · 2 comments Jan 4, 2023 · This question shows research effort; it is useful and clear Aug 21, 2021 · Hi @aureooms , That is definitely strange since optional chaining is supported. 0, and according to this webpack issue comment, it sounds like they don't expect webpack to support it until webpack 5 releases. g. Sep 13, 2019 · ERROR in . UPD3 fix for optional chaining landed into acorn 7. ts:31:1 | 31 | @injectable () FAIL my. It compiles successfully (using webpack and @babel/preset-typescript). But webpack gives me an error while transpaling. js 67:6 Module parse failed: Unexpected token (67:6) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. We recently installed swagger-ui@5. I already May 26, 2021 · This version of build-angular uses [email protected] which triggers these errors. Module parse failed: Unexpected token (22:12) File was processed with these loaders: * . We installed owl-carousel through yarn and the same prescribed pattern as we’d done with bulma-carousel from the sage Theme Development Book 3rd Dec 11, 2020 · error: Unexpected token `@`. Module parsed failed in webpack4 when exclude node_modules in babel, since it contains optional chaining operator. I switched cypress-terminal-report to version 6. ) in the distributed package causes Webpack to fail with a syntax Oct 1, 2024 · If optional chaining is still not recognized, install the @babel/plugin-proposal-optional-chaining plugin and add it to your Babel configuration. dispose();). Expected this, import, async, function, [ for array literal, { for object literal, @ for decorator, function, class, null, true, false, number, bigint, string, regexp, ` for template literal, (, or an identifier --> my. 1a152b6…. 💬 Questions and Help My project is Vue 2. 0 npm version:10. 15. 1 my code, which uses optional chaining, fails to compile. Mar 21, 2023 · Module parse failed: Unexpected token (57:19) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. Node 12 came out before the spec was final - and so did Node 13, for that matter. js file and babel. js:1 Uncaught SyntaxError: Unexpected token < main. 7. 2 Create new project with npx create-nuxt-app test (I only add eslint + stylelint) everything else was default npm install nuxt-i18n Adjust nuxt config to include nuxt-18n module (nothing else) run npm run dev Webpack fails in my case What is Expected? Webpack should build normally What is actually happening? Webpack fails? Nov 9, 2025 · Module parse failed: Unexpected token (78:32) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. Apr 28, 2020 · Module parse failed: Unexpected token (109:46) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. Could you maybe try recompiling the package to see if that helps (not a solution, but looking for simple workarounds first). Upvoting indicates when questions and answers are useful. Sep 7, 2020 · 0 Optional chaining was added in ES2020, which isn't supported by Node yet. 0 but webpack@4 uses acorn 6. Please run the shell: Feb 13, 2023 · The error “Module parse failed: Unexpected token” can occur when using Babel Loader with Webpack. This is also listed as a breaking change in the changelog of Monaco: the generated code is now bundled with ESBuild and the generated code makes use of newer browser features, e. It's a new project, using "laravel-mix": "^5. x (the issue - Webpack is using old version of Acorn library (to parse the code) which does not work with optional chaining or null coalescing syntax) Sep 5, 2023 · My stack: Electron 24 vue-cli-plugin-electron-builder 2. js file by adding those 2 babels (@babel/plugin-proposal-optional-chaining and @babel/plugin-proposal-nullish-coalescing-operator) mentioned in the linked solution by you. I still have no idea how to configure webpack to run if it's placed in a folder within the root directory. 4. 52. I believe the issue is due to how imports are working for this project, as the imports are pointing to the uncompiled, es6 code, which is causing the crash to happen in jest. The biggest problem atm is that Webpack 4 doesn't seem to support that. Steps to reproduce Create a React App with TypeScript (Haven't tried Feb 25, 2020 · I want optional chaining and nullish coalescing to appear in the outputted code because other wise, it messes up my code coverage. x. So if your 'target' compile option is ES2020 or ESNext, then typescript compiler will see an optional chaining operator and leave it alone. Has anyone else had to deal with this as well? Dec 13, 2022 · Update sanitize-html from 2. very reasonable question - yes we do have bulma installed - it was installed through the sage theme setup script. I am using @babel/plugin-proposal-optional-chaining and I have a line of code in my component. 11 Regarding optional chaing, @fabiosantoscode mentioned on 18th April 2020: Optional chaining is way more complex to implement, and its ESTree spec is not finalised yet. I am building an electron app and so it supports these latest features. It sounds like I need to configure webpack to be able to understand this syntax. mozilla. The solution is to specify the parser to use in our ESLint configuration – babel-eslint. Feb 5, 2025 · When working with TypeScript, you may have encountered the frustrating "unexpected token ?" error. It looks like it does not like the optional chaining here. Jan 30, 2023 · 问题背景描述：代码中使用ES2020（ES11）的新语法：可选链操作符?:，本地npm run build:prod构建正常，但是在云效平台构建时，之前都构建正常，突然这次报错了。 解决步骤（2步）： 1. Nov 12, 2019 · I try to use typescript 3. This often happens Jul 11, 2022 · Does this answer your question? Webpack cant compile ts 3. marko files. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. What's reputation and how do I get it? Instead, you can save this post to reference later. The TypeScript compiler can be configured to generate code for a version of Node that does not understand ??. SyntaxError) is because the current version of node I was using does not have support for Optional Chaining, because it was an old version of node. 94d0113…. Jun 11, 2021 · Check whether you need to update preset-env or webpack or something in your build workflow so that it will parse the new JS optional method chaining that is showing as unexpected there. 3 uses) doesn’t support it without adding optional chaining to Babel, or setting an acorn resolution. May 17, 2024 · Installed Plugins: I installed @babel/plugin-proposal-class-properties and @babel/plugin-proposal-optional-chaining to handle the optional chaining syntax, but the issue remains unresolved. 17. So to support this, we need to upgrade to webpack 5 (#3124). 5 node 14. js. I'm reluctantly going to make allowances for that and ship a separate build artifact that is targeted at Webpack 4, which will have optional chaining compiled out, but I wish I didn't need to do that : ( Jun 13, 2021 · Current behavior If the test code contains optional chaining, the tester fails to run. bundle. so fix of this issue will be in webpack@5: #10227 (comment) Dec 24, 2023 · I am upgrading a legacy TypeScript project that uses Webpack, and I have upgraded to the latest Webpack (5. org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining in in action but I got a webpack compilation error: unexpected token. 1. 6. 3 node: v14. Feb 7, 2019 · The solution Unexpected token errors are caused by incompatibilities in your parser options and the code you’re writing. Learn how to fix the module parse failed unexpected token error in JavaScript with this step-by-step guide. In this post, we'll explore common causes and solutions for this error. Sep 15, 2019 · I tried making webpack compile that code by making babel-loader test for the monaco folder and include that folder but nothing works. 0 With v5 beta I have an issue with the optional chaining syntax present in the distributed files. 1 webpack 4. formMethod) #336 Jan 29, 2020 · Update: Optional chaining is now supported in Acorn as of v7. in mode?. so how can I make optional chaining operator work ? by telling Nuxt to support just modern browsers. js files and it worked fine until last few days and I cannot figure out what might have caused it to break. io Oct 11, 2017 · bug report either babel-plugin-transform-optional-chaining@6 and babel-plugin-syntax-optional-chaining@6 don't work with babel@6 and webpack@3 (also, why two plugins are there?) webpack uses my . Environment Windows 10 10. 17763 npm 6. So your workaround options are: do not use webpack do not use optional chaining integrate Babel into your stack, and make sure to pass all *. ESLint enforces strict syntax rules, and any violation can result in a parsing error. 1553fdd…. js:1 So, it seems like it is a misplaced character but in my local environment the app works fine I don't get any Description It would be great to have @babel/plugin-proposal-optional-chaining inside . TLDR: Webpack 4 (which I believer webpacker 5. Jun 13, 2020 · Stack Overflow indicates the issue lies with the webpack dependency Acorn, which implemented support for Optional Chaining in their 7. /node_modules Oct 24, 2020 · Describe the bug Optional Chaining operator doesn't work with Webpack Logs $ npm run dev > TODO@0. 7 (Optional Chaining, Nullish Coalescing) Dec 3, 2022 · Hi there, We've been merrily using babel's support for transpiling JS optional chaining syntax to node v12 in our v1. Last week it stopped working and now w May 17, 2020 · Are you talking about supporting optional chaining even in browsers that don't support it? Or does optional chaining fail in Vue for some reason, even if the browser does support it? Dec 31, 2021 · The problem seems to be with the optional chaining syntax (the ?. Root Cause The error message "Module parse failed: Unexpected token (1:0)" is typically thrown by Webpack when it encounters an unexpected character in the CSS file. The library's use of optional chaining (?. Jan 25, 2022 · This question shows research effort; it is useful and clear Jun 29, 2020 · How to fix unexpected token in ESLint? Asked 5 years, 4 months ago Modified 3 years, 9 months ago Viewed 10k times Mar 23, 2022 · If the default webpack configuration provided in @cypress/webpack-batteries-included-preprocessor is not needing your project's needs, an option is to define the webpack configuration needed and providing it to the @cypress/webpack-preprocessor. 5 (which is available in @vue/cli ver. js which is not processed by babel-loader? Nov 15, 2023 · The expected behavior is for Babel to recognize the optional chaining syntax and transpile it to function correctly in environments that may not support this newer JavaScript feature. Jan 9, 2020 · UPD for everyone who will find this issue. In this case, I’m using a number of ES6 language features like arrow functions, destructured variables, and such. When is will Vue Loader move to v5? Apr 3, 2023 · That includes wanting to ship optional chaining. Disclaimer: babel-loader is a third-party package maintained by community members, it potentially does not have the same support, security policy or license as webpack, and it is not maintained by webpack. esm. 0. 3). 1", (also tried mix 4) I've followed this: https://babeljs. 2k Security Oct 5, 2020 · This is an upstream webpack issue: webpack/webpack#11186 It is fixed in Webpack 5 however it can not backport to webpack 4 since Acorn 7 introduces new AST for import() - webpack relies on the AST to do code splitting. ts 5:25 Module parse failed: Unexpected token (5:25) File was processed with these Webpack 5 supports this operator properly (because it uses a newer version of acorn, which parses this syntax). Dec 20, 2022 · This question shows research effort; it is useful and clear Dec 14, 2021 · The versions of Next and Webpack do not matter in this equation. According to node. Aug 11, 2020 · Which terms did you search for in User Guide? Null Coalescing Operator Create React App There seems to be an issue about optional chaining. 9. 14 and something very weird happened when compiling: ERROR in Dec 25, 2018 · Followup as i found that i was still hitting the issues with storybook. 89. js:1 Uncaught SyntaxError: Unexpected token < polyfills. Mar 5, 2024 · Hy everyone! Can you help me? Why am I getting these errors? “You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. If you're targeting pre-ES2020 (or using an older browser) it will barf on this. Even more strange is the fact the project compiles fine on Heroku. It is indicating that the loader is unable to parse the JavaScript file due to an unexpected token, which can refer to a syntax error or an unsupported syntax construct. Nov 7, 2019 · Issue : I just upgraded a repo to use Typescript 3. Jul 24, 2020 · Using Optional-Chaining in Angular 10 while targeting es2020 will result in the error 'Module parse failed: Unexpected token' Current Workaround is to target es2019 Jun 18, 2024 · I’m working with an NPM package that uses optional chaining. Sep 3, 2024 · After some investigation, I found the issue might be the "optional chaining operator", and it is introduced from this commit (ea03e69). · Issue #315 · unjs/unplugin · GitHub unjs / unplugin Public Notifications Fork 121 Star 3. Apr 11, 2019 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. d6f56a1…. 0 Reproduction codesandbox does not work well : ( Nov 14, 2022 · My app is created by vue cli 4, and the version is win11, node 14, webpack 4, babel 7. 2 (without above commit), and it works. 14. js which is not processed by babel-loader? Jul 17, 2020 · jfbrennan commented on Feb 8, 2021 @sodatea It's webpack that can't yet parse such syntax webpack/webpack#11198 Optional chaining is only in Webpack v5. js files (not sure which Webpack config I need to look for). io As soon as I add the client part to my legacy app i get an error and Can't figure out what is wrong. 3 to 2. Aug 4, 2021 · When running yarn storybook --webpack-debug, it seems optional chaining is enabled for . 0 Local ESLint version:9. Jul 16, 2020 · Versions nuxt: v2. value?. test. How can I make monaco-editor work under webpack 3? Feb 9, 2020 · Since upgrading to react-scripts 3. This operator is not supported by webpack by default in its current version (as far as I know). Oct 14, 2020 · With 6. a to obj ? . Jun 9, 2020 · I use optional chaining in one of my . babelrc and er I want to add optional chaining to my Laravel project. Looks like Vue Loader is on v4. 46. org/concepts#loaders Mar 4, 2024 · After upgrade to node 16, i am facing this error, Module parse failed: Unexpected token (40:35) Asked 1 year, 4 months ago Modified 1 year, 4 months ago Viewed 521 times Mar 26, 2025 · The “Parsing error: Unexpected token” ESLint warning typically occurs when ESLint encounters a syntax error or unsupported syntax in your code. Aug 6, 2024 · ModuleParseError: Module parse failed: Unexpected token (101:25995) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. (This seems to conflict with Node's description of the --harmony flag - V8's Dec 14, 2022 · Webpack Failed to compile: loader issues with optional chaining Asked 2 years, 9 months ago Modified 2 years, 9 months ago Viewed 3k times Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. 5. 1 dev C:\Users\test\sapper-webpack-typescript > sapper dev server src/routes/_layout. How Optional Chaining Can Save You From Unexpected Optional chaining is a feature in Javascript which lets us access the child properties of an object, even if the parent object doesn't Jun 17, 2021 · I was able to overcome this issue using @babel/plugin-proposal-optional-chaining, but for me the only way I could get Webpack to use the Babel plugin was to shove the babel-loader configuration through the Webpack options in vue. Jun 15, 2023 · Getting SyntaxError: Unexpected token, I think it's due to the optional chaining. I don’t see any information in the documentation on how to do this. . See https://webpack. The packa… Apr 7, 2024 · A step-by-step guide on how to solve the error "You may need an additional loader to handle the result of these loaders". 8. e. Currently he is a SWE at Microsoft managing Web Infra for OneDrive/Sharepoint Oct 11, 2017 · bug report either babel-plugin-transform-optional-chaining@6 and babel-plugin-syntax-optional-chaining@6 don't work with babel@6 and webpack@3 (also, why two plugins are there?) webpack uses my . Apr 27, 2023 · I am having an issue when I am trying to use the aws-sdk v3. To Reproduce Oct 1, 2024 · This question is similar to: Module parse failed: Unexpected token (11:19). Installing this plugin seems to clobber something that is cached because I am not seeing any config files changing aside from package. bablelrc are disabled. Oct 2, 2025 · 错误说明 vue cli 项目打包编译出现 Unexpected token错误。 May 22, 2018 · Hey @mmirus, thanks for your reply. So if your target compile option is ES2020 or ESNext, then TypeScript compiler will see an optional chaining operator and leave it alone. Vue uses webpack (@sairamsunkara673M is using Vue and therefore webpack). ” Webpack uses Acorn parser, and Acorn does not support optional chaining as of now. babelrc (I tried to remove . For fix this error acornjs/acorn#891 and acornjs/acorn#890 must be merged. vue file that us Nov 29, 2024 · Environment Node version:20. 安装： npm install @babel/plugin-proposal-optional-chaining --save-dev 扩展：空值合并运算符（??：）是： @babel/plugin-proposal-nullish Apr 21, 2024 · The former looks like babel output handling an optional in vanilla JS whereas the latter is leaving the optional chaining in. Dec 10, 2020 · I tried to use https://developer. Includes causes and solutions, plus code examples. 1 it works, only happens with 6. So you may need an addiotional loader for the pdfjs-dist files. js in the folder webpack/webpack. Could it be an issue that Webpack is trying to load downshift. However when I run a test against the opti Jan 3, 2020 · The spec for the optional chaining feature was just promoted to Stage 4 (Finished) on December 22, 2019. name const value = test ?? ‘Default’ If i try it without lang=“ts” on script it works Also those features works fine on Vue 3 project generated with vue cli.