Jest failed Unexpected token } in JSON at position 441 Vue2 Typescript

Version

1.3.0

Reproduction link

github.com

Steps to reproduce

run yarn test.

What is expected?

run correctly the test

What is actually happening?

Shows the next error:

 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:

    SyntaxError: Unexpected token } in JSON at position 441
        at JSON.parse (<anonymous>)

      at parse (node_modules/tsconfig/src/tsconfig.ts:195:15)
      at readFileSync (node_modules/tsconfig/src/tsconfig.ts:181:10)
      at Object.loadSync (node_modules/tsconfig/src/tsconfig.ts:151:18)
      at find (node_modules/vue-jest/lib/load-typescript-config.js:33:39)
      at loadTypescriptConfig (node_modules/vue-jest/lib/load-typescript-config.js:73:26)
      at compileTypescript (node_modules/vue-jest/lib/compilers/typescript-compiler.js:9:20)
      at processScript (node_modules/vue-jest/lib/process.js:23:12)
      at Object.module.exports [as process] (node_modules/vue-jest/lib/process.js:42:18)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:620:31)

[yesiddg]

Add to the jest.config.js

transformIgnorePatterns: [‘/node_modules/(?!library-with-problems)’]

[1baga]

if you have a trailing comma anywhere in your ts-config file do take it off… that was what fixed my problem…