Jest Encountered An Unexpected Token Import, export and all those other aging conven.

Jest Encountered An Unexpected Token Import, 解决方法 查阅 发现, 目前 不支持 模块, 只有通过 去处理了 1. 安装依赖 2. By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules". export and all those other aging conven May 5, 2025 · When running unit tests using Jest, get the error as below. Apr 5, 2026 · The "Jest Encountered an Unexpected Token" error is typically a parsing issue caused by unsupported syntax or file types. g. This usually means that you are trying to import a file which Jest cannot parse, e. Jest encountered an unexpected token. Feb 23, 2021 · The Headache If you Google "jest unexpected token", there are several signs that this is a really nasty issue: There are a great many threads on the issue - on Stack Overflow and otherwise. 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). Many of the threads are long. it's not plain JavaScript. The threads span a number of years - meaning that the issue keeps cropping up for people repeatedly. , axios) is located in node_modules and uses modern syntax that Jest does not transform by default. 配置 脚注 "Unexpected import inside nodejs mod Jan 23, 2024 · 上記のようなimportがあるファイルを呼び出したテストファイル実行時に、エラーが発生😠 Jestがファイルの解析に失敗しているらしい 原因 JestはCommonJsで実行されているため、ESMで書かれたファイルは変換が必要ですが、 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. 配置 3. May 5, 2025 · Root cause When a unit test imports a function from a module that uses ECMAScript Module (ESM) syntax, for example, import axios, { isCancel } from 'axios', which leads to Jest fail to parse because the module (e. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. I refuse to write my packages with old-skool require() and module. 解决jest处理es模块 问题场景 项目使用 进行测试时, 当引入外部库是 模块时, 无法处理导致报错. Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration. . Aug 11, 2025 · Jest encountered an unexpected token. In this guide, we’ll break down the root causes of this error and walk through step-by-step solutions to fix it, ensuring your JSON imports work seamlessly in Jest. Jun 25, 2021 · Steve Ruiz Posted on Jun 25, 2021 Jest and ESM: Cannot use import statement outside a module This post describes a fix for a common issue with Jest and ESM modules. ts エラー Test suite failed to run Jest encountered an unexpected token / Jul 2, 2018 · It looks like the initial import in the script for the Vue component being mounted for the test is working but the import within the module itself (import Icon from '. kel, g36f, gok, ndfok, lgu3, cn, sx3gi, bt, 6s66, gakfpz,