Unexpected Token Optional Chaining. 7. Unexpected token u in JSON at position 0 javascript Copy Apr 27,

7. Unexpected token u in JSON at position 0 javascript Copy Apr 27, 2023 · ERROR in . Jun 17, 2021 · I imported the NPM module that has been causing my grief (@vime/vue-next 5. It may be triggered when a single = sign was used instead of == or ===. Instead of causing an error, it simply returns undefined when a null or undefined value is encountered. Test failed because of "Support for the experimental syntax 'optionalChaining' isn't currently enabled" can be resolved by adding Jul 8, 2025 · The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. May 7, 2020 · The optional chaining operator (?. If you are building your application with react and you are seeing the error: "module parse failed: Unexpected token" due to the use of Optional Chaining in the object path ( e. Oct 14, 2020 · Why doesn't google Apps Script support latest javascript features like optional chaining even though it's running on Chrome V8? When optional chaining is used, clasp is throwing an error. I think we're hitting this same issue with optional chaining. 7 to test out optional chaining. " optional chaining Asked 3 years ago Modified 2 years, 11 months ago Viewed 599 times 前回の反省点として、Optional Chainingに問題をすり替えてしまって、結果、混沌としてしまったです。 よくよく考えれば、ts-loaderもbabelも Optional Chaining はサポートしているのであって、こいつらはローダー君は指定されたバージョン Jul 31, 2019 · It's very effective (very compact). Discover best practices for Nov 8, 2025 · This happens because ESLint may not recognize optional chaining by default, even though Node 14 supports it. Apr 20, 2022 · I import 3. Module parse failed: Unexpected token (104:38) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. ESLint red highlights for optional chaining (?. env?. Aug 26, 2024 · Hi! I don't get why I get Parsing error: Unexpected token . Aug 27, 2021 · For some reason optional chaining isn't working even though I'm using the Node 14 LTS. js:32 Uncaught Error: Module parse failed: Unexpected token (43:25) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. Summary: Learn how to debug and resolve `SyntaxError: Unexpected token '. Sep 7, 2020 · Optional chaining was added in ES2020, which isn't supported by Node yet. js 14. May 2, 2020 · I use optional chaining in one of my . '` when using the optional chaining operator in Node. Nov 30, 2021 · -2 After using the optional chain, I've received this problem. 0. process. js) in submitter?. js above 12 support the optional-chaining operator (a ECMAScript 2020 feature). Jul 16, 2020 · Versions nuxt: v2. ) expression can short-circuit with a return value of undefined. $el Dec 31, 2021 · It depends on NodeJs version as well, Node 14 supports optional chaining. 2k Security Aug 4, 2021 · Unexpected token (due to optional chaining) in @storybook-core-client? #15749 Unanswered ekeijl asked this question in Help edited Sep 7, 2020 · Optional chaining was added in ES2020, which isn't supported by Node yet. Jan 9, 2020 · @evilebottnawi looks like @inoyakaigor updated the description and also provided a reproduction repo. It compiles successfully (using webpack and @babel/preset-typescript). io Jan 29, 2020 · 6 Relating to @Klaycon's answer, Acorn released today a new version that supports optional chaining. I want to add optional chaining to my Laravel project. formMethod. If you look at the source code of the RESTManager of discord. Oct 8, 2023 · I followed the suggested solutions from all other similar problems in the following manner: -updated node version (even though I had version 18 which supports optional chaining and nullish coalescing) -installed babel's plugins i. Therefore, treating an evaluated optional chaining expression as a function, object, number, etc May 2, 2020 · I use optional chaining in one of my . it's not plain JavaScript. So if your 'target' compile option is ES2020 or ESNext, then typescript compiler will see an optional chaining operator and leave it alone. Here's an example What I can't figure out is how to get TS to compile it properly. green, even node. js. on this line, though the node version specified in package. Similarly with the nullish coalescing operator ??. Sep 15, 2020 · In case someone has a problem with optional chaining in jest + testing-library/react stack. 0 eslint-plugin-vue version: 6. Therefore, treating an evaluated optional chaining expression as a function, object, number, etc. This feature is available in @babel/plugin-proposal-optional-chaining, which is also included in the ECMA-262 / @babel/preset-env, or specificially for Vue apps: just @vue/app. ) operator accesses an object's property or calls a function. In this blog, we’ll walk through a step-by-step guide to resolve this error, ensuring ESLint properly validates optional chaining in your Node 14 project. 4. // const serverResponseCode = response. both transform and syntax plugins for optional chaining and nullish coalescing The issue still remains. get? What's your opinion on that? Feel free to share and react if you liked this article. May 6, 2021 · JEST Not Supporting Optional Chaining Operator Ask Question Asked 4 years, 8 months ago Modified 4 years, 8 months ago disallow use of optional chaining in contexts where the undefined value is not allowed (no-unsafe-optional-chaining) The "extends": "eslint:recommended" property in a configuration file enables this rule. Nov 12, 2019 · I try to use typescript 3. The optional chaining (?. operator. e. Optional Tagged with javascript, babel, eslint, vscode. Nov 7, 2019 · Issue : I just upgraded a repo to use Typescript 3. js files and it worked fine until last few days and I cannot figure out what might have caused it to break. babelrc However, I have this error: Module parse failed: Unexpected token (22:16) You may need an appropr Feb 28, 2021 · I am trying to run a test with Jest and I'm currently using jsx and tsx (changing from js to ts) in my react app but when I run my tests, all jsx tests are successful except those in tsx with optional blocking. 2 Node version: 12 Please show your full configuration: const fs = require ('fs'); // Import AirBNB base rules to wrap them onto framework specific config Feb 7, 2020 · Optional chaining in templates does not seem to work #11088 Closed DRoet opened on Feb 7, 2020 · edited by posva The optional chaining (?. Sep 17, 2020 · For the above in the same pug file, the first line works fine, but the second produces a Syntax Error: Unexpected token. main. js v14 does not yet support the optional chaining ?. We've been supporting similar syntax in templates for a while now, calling it the "safe naviga Aug 6, 2019 · I am looking for the relevant eslint rules for @babel/plugin-proposal-optional-chaining @babel/plugin-proposal-nullish-coalescing-operator My editor highlights in red when I do the following Sep 7, 2020 · Optional chaining was added in ES2020, which isn't supported by Node yet. data?. Even more strange is the fact the project compiles Jun 14, 2020 · 2 Per node. ). May 6, 2020 · 13 All versions of Node. 2. ) provides a concise way of accessing the value of a property that is deep within a chain of connected objects without having to explicitly validate the reference. js v13's use of the newer nullish coalescing and optional chaining operators are why the library requires node. Option chaining is only supported in Node versions 15 and above. operator AFAIK. json should support ?. ) enables developers to securely access deeply nested properties, even if an intermediate property is null or undefined. refreshBtn?. It's a new project, using "laravel-mix": "^5. Jul 8, 2025 · The optional chaining (?. More details: https://caniuse. js 10:30 Module parse failed: Unexpected token (10:30) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. Nov 6, 2024 · Optional Chaining (?. Aug 2, 2021 · And there's a problem, it doesn't work in my vite@2. ) in that file (app/javascript/turbo/form_submissions. js >=14. " message when I try to use my express app in debug mode in VSCode (F5) if my code includes optional chaining (?. But webpack gives me an error while transpaling. x to run now. Don't both go through the same Javascript engine? Feb 18, 2022 · Learn how to use optional chaining in Vue templates for cleaner and more efficient code. JES Dec 22, 2021 · I get an "Uncaught SyntaxError: Unexpected token . It actually works fine on iphone12, but doesn't work in my another android mobile. x. Bug report Packages affected sandpack-client sandpack-react Description of the problem When I import an npm package which uses optional chaining it throws an error Dec 12, 2019 · 🚀 feature request Relevant Package @angular/compiler Description Optional chaining[1] reached stage 4. 0 so they would not work in your v12. Sep 7, 2020 · Optional chaining was added in ES2020, which isn't supported by Node yet. Dec 24, 2023 · priority-queue. Feb 10, 2023 · Webpack parse failed - Unexpected token on optional chaining Asked 2 years, 11 months ago Modified 2 years, 11 months ago Viewed 1k times Jan 18, 2023 · Node support for Optional Chaining (?. Sep 17, 2021 · To use optional chaining, and other newer features, you will need to use Babel. However when I run a test against the opti 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 13, 2020 · Bug report What is the current behavior? Using Optional Chaining in TypeScript results in an error expecting a loader. By default, if Jest sees a Babel c Oct 5, 2020 · I just try to remove the @babel/plugin-proposal-optional-chaining plugin from my configuration as it is natively supported (and managed through @babel/preset-env) Jun 23, 2020 · The JS parser in Webpack 4 doesn't support optional chaining. As soon as Webpack reflects the change on their side- using optional chaining with webpack shouldn't be a problem anymore. Discord. However, this is for Jest, ts-jest doesn’t handle logic “when should js be transpiled” or “is this syntax supported” Jan 17, 2023 · In summary the app was built successfully in node 16 and deployed to the app service as a node 16 app but whatever the container was doing it was doing it in node 12 and so complained about syntax that was not available in node 12 eg optional chaining and nullish coalescing. With targets:"last 2 Chrome versions, last 2 Firefox versions" the code is left untransformed by babel-loader (because those targets support it) so Webpack fails to parse it. 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. It seems that the error is being caused by the inclusion of the TypeScript optional chaining operator (?. If the object accessed or function called using this operator is undefined or null, the expression short circuits and evaluates to undefined instead of throwing an error. js using optional chaining grammar which was not supported in some old version browsers, I think this should be avoided monaco-editor version: 0. Jul 17, 2020 · I am under the impression this should work because 1) this is just vanilla js!!!, 2) Babel, which I think vue-loader is using, supports the optional chaining operator, and 3) it's not in the template which won't be supported until Vue 3. $refs. Oct 31, 2019 · Optional Chaining is a new JavaScript API that will make developers' lives easier :D. Jan 3, 2020 · Still, whether it needs a flag or not, I wouldn't expect to see the feature until the Node 14 release around April 2020. 1 I get the following error: Module parse failed: Unexpected token (1:25052) You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. 5. 4 project. vue <template> <div> <nuxt-link to="/about">about</nuxt-link> <div Sep 23, 2019 · My project is Vue 2. 29. If babel supports optional chaining and babel-eslint doesn't, then that could be an issue with babel-eslint, so you could consider reporting an issue there. If the current behavior is a bug, please Jul 16, 2022 · Optional chaining is a feature in Javascript which lets us access the child properties of an object, even if the parent object doesn't exist. 6. To resolve this issue, verify the tenant is using a newer version (>=15) of Node and that the action is also set to use the newer runtime as well. 1 Browser: OS: Aug 7, 2021 · Indeed. I'm not getting any syntax errors in my project, but this: let imageFil. 7) or a preprocessor like Babel. 7 features like Optional Chaining, Nullish Coalescing. vue file that uses "?" this. What if the polyfill of the Optional Chaining involved the application of a utility function like lodash. Try to use this: "parserOptions": { "ecmaVersion": 2020 } Optional chaining was added in ES2020, which isn't supported by the node. 31 BTW), ran the serve script and got the Unexpected token error on a line containing optional chaining. app: Module parse failed: Unexpected token (50:40) app: File was Aug 18, 2017 · However, it should still be possible to lint code containing optional chaining syntax if you use a parser that can handle it. 0 Reproduction codesandbox does not work well :( // index. ) and nullish coalescing (??) are easily fixed by ensuring ESLint’s parser recognizes the syntax and (if using Babel) transpiling the features for older environments. 4 myself, it does work for me. g. Nov 22, 2021 · Firebase firestore function deploy failed due to unexpected token ". /node_modules/@aws-sdk/signature-v4/dist-es/getCanonicalHeaders. , can cause TypeError or unexpected results. Jun 15, 2023 · Getting SyntaxError: Unexpected token, I think it's due to the optional chaining. com/mdn-javascript_operators_optional_chaining However, you can still enable it on the older browser by enabling the Experimental JavaScript config on the browser. I see you're using babel-eslint. ) The problem I started work this morning and suddenly none of my npm scripts would work at all, they all gave me the following … Mar 23, 2020 · Tell us about your environment ESLint version: 6. Even more strange is the fact the project compiles Sep 7, 2020 · Optional chaining was added in ES2020, which isn't supported by Node yet. · Issue #315 · unjs/unplugin · GitHub unjs / unplugin Public Notifications Fork 121 Star 3. MDN seems to claim that both are supported as of node. I am using @babel/plugin-proposal-optional-chaining and I have a line of code in my component. code; How should I configure my Vite? Aug 16, 2020 · 🐛 Bug Report Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. Oct 25, 2021 · There was code inside editor. js yet. So if your target compile option is ES2020 or ESNext, then TypeScript compiler will see an optional chaining operator and leave it alone. js v12 here, you'll see that it used the older way of doing this (||) instead of nullish coalescing (??). Then I used edge://inspect debugging to find this: Uncaught SyntaxError: Unexpected token . 3 node: v14. Apr 26, 2020 · In a create-react-app project, I am using @babel/plugin-proposal-optional-chaining in my `. Looks like optional chaining has landed. May 25, 2025 · How Optional Chaining Actually Works Optional chaining gives you a way to safely walk through an object’s structure without crashing the program when something in the chain is missing. 1", (also tried mix 4) I've followed this: https://babeljs. Enforce using concise optional chain expressions instead of chained logical ands, negated logical ors, or empty objects. 13. Though, when I test nodejs v14. If you want to play with optional chaining today, your best bet is to use TypeScript (which added optional chaining in version 3.

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