Jest is consistently encountering errors when trying to parse a JSON file located within the node_modules folder

I've been having trouble setting up my jest.config.js file to run tests on a TypeScript Vuejs app. Jest is throwing an error about encountering an unexpected token while parsing a JSON file in the node_modules folder. I'm not sure why this is happening, especially since importing a plain JavaScript Vue file works fine. The error message from Jest is displayed below:

Test suite failed to run
    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:
     • 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:
    SyntaxError: Unexpected token ] in JSON at position 774
        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:453:35)

Below is the content of my jest.config.js file:

your custom jest config content will be here

Additionally, I have provided an example of one of the Vue files I attempted to import:

your Vue file content will be here
typescriptvue.jsjestjs

Answer №1

An issue with the error call stack suggests that it occurred within Vue loader while parsing TypeScript configuration during the transformation of the 

<script lang="ts">
block.

It appears to be a genuine syntax error in a .json file. Unfortunately, the specific file location is not specified and requires troubleshooting. Since this error arises during TypeScript initialization, the culprit is likely within tsconfig.json or a related file.

Having a separate json5-jest transformer for .json files is not necessary as TypeScript and Babel can handle them. Using JSON5 with a .json extension could lead to issues like the one described here.

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