Jest encountered an unexpected token
Author: MaryamAdnan3Created Feb 13, 2024Updated Sep 30, 2025
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Detail:
I have updated a third party library axios version to 1.6.7 . When I ran tests I started to get the following error ` Jest encountered an unexpected token
This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.
By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".
Here's what you can do:
• If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
• To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
• If you need a custom transformation specify a "transform" option in your config.
• If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.
You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/en/configuration.html
Details:
D:\gitRepos\apimatic-js-runtime\node_modules\axios\index.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import axios from './lib/axios.js';
^^^^^^
SyntaxError: Cannot use import statement outside a module
> 1 | import { AxiosHeaders, AxiosInstance, AxiosRequestConfig, AxiosResponse, AxiosResponseHeaders, RawAxiosResponseHeaders } from 'axios';
| ^
2 | import axios from 'axios';
3 | import isNode from 'detect-node';
4 | import FormData from 'form-data';
at Runtime.createScriptFromCode (../../node_modules/jest-runtime/build/index.js:1350:14)
at Object.<anonymous> (src/httpClient.ts:1:1)`package.json
"devDependencies": {
"@babel/cli": "^7.21.5",
"@babel/core": "^7.22.1",
"@babel/preset-env": "^7.18.2",
"babel-jest": "^26.6.3",
"@size-limit/preset-small-lib": "^7.0.8",
"@types/detect-node": "^2.0.0",
"@types/lodash.flatmap": "^4.5.6",
"abort-controller": "^3.0.0",
"babel-plugin-annotate-pure-calls": "^0.4.0",
"jest": "^26.6.3",
"jsdom": "^19.0.0",
"jsdom-global": "^3.0.2",
"lerna-alias": "3.0.3-0",
"rollup": "^2.79.0",
"rollup-plugin-typescript2": "^0.31.0",
"size-limit": "^7.0.8",
"ts-jest": "^29.1.2",
"typescript": "^4.1.2"
}jest.config.js `const { jest: lernaAliases } = require('lerna-alias');
module.exports = { preset: 'ts-jest', moduleNameMapper: lernaAliases(), transform: { '^.+\.tsx?$': 'ts-jest', // Add TypeScript transformation '^.+\.jsx?$': 'babel-jest', // Add Babel transformation for ES6 modules }, coverageReporters: [['lcov', { projectRoot: '../../' }]] }; `
Source: kulshekhar/ts-jest