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Jest Encountered An Unexpected Token, Aug 11, 2025 · Jest encountered an unexpected token. May 12, 2021 · あるnpmパッケージを追加した後、Webpackのビルドは通っているのにJestでは以下のようなエラーが出るようになった。 Test suite failed to run Jest encountered an unexpected token This usually means that you are trying to import a file which Jest cannot parse, e. May 5, 2025 · When running unit tests using Jest, get the error as below. export and all those other aging conven Apr 5, 2026 · The "Jest Encountered an Unexpected Token" error is typically a parsing issue caused by unsupported syntax or file types. This is Jan 14, 2021 · Jest encountered an unexpected token when working with React TypeScript Ask Question Asked 5 years, 4 months ago Modified 5 years, 4 months ago Jun 27, 2023 · Introduction: Jest, a powerful testing framework for JavaScript and TypeScript projects, occasionally encounters unexpected token errors while parsing files. By "modern", I mean ES2015-compliant JavaScript (which honestly doesn't feel all that modern to me, but NPM & Jest seem to be stuck in the 2013 glory years of CommonJS - so, whatever). By configuring Babel for JavaScript/JSX/TypeScript, mocking non-JS files, or using custom transformers, you can resolve it. In my case, build time stays Jest encountered an unexpected token: SyntaxError: Unexpected Token { Asked 7 years, 9 months ago Modified 5 years, 8 months ago Viewed 6k times Oct 8, 2024 · jestの設定 transformIgnorePatterns で、特定のモジュールをトランスパイルするように設定します。 今回は web-vitals というパッケージがESModule記法だったので、こちらを対象外とするように設定しています。 Dec 24, 2023 · How to Fix "SyntaxError: Unexpected token '<'" Jest Error? Daniyal Hamid 2 years ago 1 min read Jun 8, 2024 · 事象 GPTに聞いても解決しなかったので備忘録として書き出します。 npm run test hogehoge. These errors can occur due to non Feb 13, 2024 · The key changes are: Using @swc/jest to compile both TypeScript and JavaScript files Overriding transformIgnorePatterns (by default, Jest ignores node_modules) and, this doesn't require the --experimental-vm-modules Node option Note: Removing the ignore pattern means all node_modules may be transformed, which can impact performance if you have many dependencies. Jest encountered an unexpected token: Learn how to fix this common JavaScript error with step-by-step instructions and code examples. ncq, hvgku, ngv, iak, wps4n, kdkj, wlvljt, pits5w, pjth, zgks,