Issues arise with Jest tests following the implementation of the 'csv-parse/sync' library

Currently utilizing NestJs with Nx.dev for a monorepo setup. However, I've come across an issue after installing csv-parse/sync - my Jest tests are now failing to work.

Jest encountered an unexpected token

Jest failed to parse a file due to non-standard JavaScript syntax being used in your code or its dependencies, or possibly a lack of configuration support in Jest.

By default, Jest supports Babel for transforming files into valid JS based on your Babel settings.

The "node_modules" folder is typically excluded from transformation by default.

Here are some possible solutions:
 • If using ECMAScript Modules, refer to https://jestjs.io/docs/ecmascript-modules to enable it.
 • For TypeScript usage, consult https://jestjs.io/docs/getting-started#using-typescript
 • To transform certain "node_modules" files, specify a custom "transformIgnorePatterns" in your configuration.
 • If a custom transformation is needed, define a "transform" option in your config.
 • When wanting to mock non-JS modules (e.g. binary assets), utilize the "moduleNameMapper" config option.

Details:

    /home/username/project/node_modules/csv-parse/lib/sync.js:2
    import { Parser } from './index.js';

I attempted to follow the provided links without success. Has anyone else encountered this same issue?

typescriptjestjsnestjsmonoreponode-csv-parse

Answer №1

Update your jest.config.json file or the jest configuration in your package.json to include these lines

    "moduleNameMapper": {
      "^csv-parse/sync": "<rootDir>/node_modules/csv-parse/dist/cjs/sync.cjs"
    }

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