CODEWITHSUNDEEP
typescriptjestjsnestjsmonoreponode-csv-parse
zedian
zedian

Reputation: 445

Jest tests fail after using 'csv-parse/sync' lirbary

I am using NestJs with Nx.dev for monorepo. After I installed csv-parse/sync and used my Jest tests don't work anymore.

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.

Details:

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

I tried to follow the above links but had no luck. Anyone faces the same problem?

Upvotes: 2

Views: 1895

Answers (2)

user19306150
user19306150

Reputation: 31

add lines to jest.config.json, or your jest config in package.json

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

Upvotes: 3

francis duvivier
francis duvivier

Reputation: 2186

What worked for me was adding the line from @user19306150 to my jest.config.js:

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

Here also link to the jest documentation regarding the moduleNameMapper: https://jestjs.io/docs/configuration#modulenamemapper-objectstring-string--arraystring

Upvotes: 0

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