ag-grid: Jest encountered an unexpected token

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[x] bug report => see 'Providing a Reproducible Scenario'
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Providing a Reproducible Scenario run ‘npx jest’ with
“@ag-grid-community/client-side-row-model”: “^30.0.6”, “@ag-grid-community/core”: “^30.0.6”, “@ag-grid-community/styles”: “^30.0.6”,

● Test suite failed to run

Jest encountered an unexpected token

Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax.

Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.      

By default "node_modules" folder is ignored by transformers.

Here's what you can do:
 • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/ecmascript-modules for how to enable it.
 • If you are trying to use TypeScript, see https://jestjs.io/docs/getting-started#using-typescript
 • 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/configuration
For information about custom transformations, see:
https://jestjs.io/docs/code-transformation

Details:

C:\repo\project\node_modules\@ag-grid-community\core\dist\esm\es6\main.mjs:15
export { ColumnFactory } from "./columns/columnFactory.mjs";
^^^^^^

SyntaxError: Unexpected token 'export'

   5 |
   6 | import * as vscode from 'vscode';
>  7 | import { GridOptions, Grid } from "@ag-grid-community/core";
     | ^

  at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1496:14)
  at Object.<anonymous> (src/test/unit/GridUtils.test.ts:7:1)

Jest.config.js

module.exports = { “transform”: { ‘^.+\.(ts|tsx|js|jsx|mjs)$’: [‘ts-jest’, { diagnostics: false, }, ], }, transformIgnorePatterns: [ ‘/node_modules/(?!(@ag-grid-community|@ag-grid-enterprise|ag-grid-react|ag-grid-enterprise|ag-grid-community)/)’, ], testEnvironment: ‘node’, testRegex: ‘/src/test/unit/.*\.(test|spec)?\.(ts|tsx)$’, moduleFileExtensions: [‘ts’, ‘tsx’, ‘js’, ‘jsx’, ‘json’, ‘node’, ‘mjs’], reporters: [ ‘default’, [‘jest-junit’, { outputName: ‘unit-test-results.xml’ }], ], };

Current behavior Fail to run jest unit

Expected behavior Error is not thrown, and component functionality works as indended.

Please tell us about your environment:

Windows 10, VSCode, NPM

AG Grid version: X.X.X 30.0.6
Browser: VsCode WebWiew/IFrame
Language: [all | TypeScript X.X | ES6/7 | ES5] TypeScript:5.1.6 ES6

About this issue

Original URL
State: closed
Created a year ago
Reactions: 4
Comments: 22 (6 by maintainers)

Most upvoted comments

@seanlandsman This solution generates the error from the beginning when trying to import @ag-grid-community/react.

SyntaxError: Unexpected token 'export'

Isn’t the real issue here that @ag-grid-community/react doen’t have the cjs versions?

leandertolksdorf on Oct 26, 2023

My solution above should take account of the fact you’re using a framework and default to that package

Are you saying this doesn’t work for react? I tried on a react project and it worked for me

Still, you could try this:

const frameworks = ['angular', 'react', 'vue', 'vue3'];

module.exports = (request, options) => {
    return options.defaultResolver(request, {
        ...options,
        packageFilter: pkg => {
            if(frameworks.some(framework => packageName.includes(framework)) {
                 return pkg;
            }

            const packageName = pkg.name;
            const agDependency = packageName.startsWith("@ag-grid"));
            return {
                ...pkg,
                // default to use the CommonJS ES5 entry point for Jest testing with AG Grid
                main: agDependency ? './dist/cjs/es5/main.js' : pkg.module || pkg.main,
            };
        },
    });

I’ve not tried this - perhaps you can and let me know if it works for you

seanlandsman on Oct 13, 2023

As a community support I can tell you that mappings works for us in Ag grid 31.0.2

jest.config.js

 moduleNameMapper: {
    "@ag-grid-community/react":
      "<rootDir>/node_modules/@ag-grid-community/react/bundles/ag-grid-react.min.js",
    "@ag-grid-community/core":
      "<rootDir>/node_modules/@ag-grid-community/core/dist/cjs/es5/main.js",
    "@ag-grid-enterprise/core":
      "<rootDir>/node_modules/@ag-grid-enterprise/core/dist/cjs/es5/main.js",
    "@ag-grid-community/client-side-row-model":
      "<rootDir>/node_modules/@ag-grid-community/client-side-row-model/dist/cjs/es5/main.js",
  },

depends on your used modules list can be bigger

arek-widelab on Feb 16, 2024

The solution proposed by seanlandsman does not work for React applications. The idea in the solution is that with custom Jest resolver we redirect the entry point for the module to a CJS version. But for the @ag-grid-community\react module there is no CJS version of the module provided. For other modules you have dist folder with cjs and esm subfolders that contain corresponding version of the module but for @ag-grid-community\react there is only lib folder containing esm version of the module.

alexandrenikolov on Oct 13, 2023