What causes tests to fail with an error message SyntaxError: Unexpected token {?

Hey there! I'm encountering an issue with webpack 5 and babel while trying to run tests that were previously written. Despite following the jest documentation for configuration, I haven't been able to find a solution after exploring various forums and GitHub threads. Nothing seems to work no matter what I try. Any assistance would be greatly appreciated! Thanks!

({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import { shallowMount, mount, createLocalVue } from '@vue/test-utils';
                                                                                                ^

SyntaxError: Unexpected token {

  at Runtime.createScriptFromCode (../../node_modules/jest-runtime/build/index.js:1350:14)

package.json

"devDependencies": {
    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
    "@babel/plugin-transform-regenerator": "^7.12.13",
    "@babel/preset-env": "^7.13.12",
    "@babel/runtime": "^7.13.10",
    "@mdi/js": "^5.9.55",
    "@mdi/svg": "^5.9.55",
    "@vue/babel-preset-app": "^4.5.12",
    "@vue/test-utils": "^1.1.4",
    "babel-core": "^7.0.0-bridge.0",
    "babel-jest": "^26.6.3",
    ... 
},
"dependencies": {
    "axios": "^0.21.1",
    "core-js": "^3.10.0",
    "izitoast": "^1.4.0",
    "regenerator-runtime": "^0.13.7",
    "vue": "^2.6.12",
    ...
}
...

.babelrc

{
"presets": [["@babel/env", { "modules": false }]],
"env": {
    "test": {
        "presets": [["@babel/env", { "targets": { "node": "current" } }]]
    }
}

}

javascriptvue.jsunit-testingjestjs

Answer №1

If you're encountering a parsing error, make sure to configure Jest to properly parse your test files and dependencies. To assist you further, I'll need to examine your jest.config file or package.json where your Jest setup is defined.

Below are some essential settings to get you started:

// .babelrc
{
    "presets": [
        [
            "@babel/preset-env",
            {
                "targets": {
                    "esmodules": true
                }
            }
        ],
        "vue"
    ]
}

// package.json
{
  "jest": {
    "moduleFileExtensions": ["js", "json", "vue"],
    "transform": {
      "^.+\\.js$": "babel-jest",
      "^.+\\.vue$": "vue-jest"
    }
  }
}

Don't forget to install the necessary package first with npm install -D babel-preset-vue

Wishing you a wonderful day ahead!

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