When running the `vue-cli-service test:unit` command, an error involving an "Unexpected token" message related to the usage of the spread operator

Within my code, I am utilizing the destructuring operator. However, during the module build phase, I encountered an "Unexpected token" error. Any suggestions on how to resolve this issue without completely rewriting my code to avoid using the destructuring operator?

To run tests, I execute 

vue-cli-service test:unit src/**/*.spec.js
.

Here is a snippet from my package.json:

    ...
    "devDependencies": {
        "@vue/cli-plugin-babel": "^3.12.1",
        "@vue/cli-service": "^4.5.9",
        "babel-plugin-transform-runtime": "^6.23.0",
        "babel-cli": "^6.26.0",
        ...
    },
    ...

javascriptvue.jsunit-testingtestingvue-cli

Answer №1

To solve this issue, I had to incorporate @babel/preset-env by configuring it in either babel.config.js (in my case) or .babelrc

presets: [
    [
        '@babel/preset-env',
        {
            targets: {
                esmodules: true,
            },
        }
    ]
],

The solution was found in a comment on GitHub, which can be seen here

Furthermore, you can learn more about targets.esmodules in depth

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