vueI18n Configuration Problems with Vue 3 and JEST 27

When working with Vue 3 and JEST 27, you may encounter configuration problems with vueI18n. In this blog post, we will explore two possible solutions to resolve these issues.

Solution 1: Configuring vueI18n with Vue 3 and JEST 27

To configure vueI18n with Vue 3 and JEST 27, you need to install the necessary dependencies and update your configuration files.

First, install the required dependencies:


npm install vue-i18n@next --save-dev


Next, update your Jest configuration in the jest.config.js file:


module.exports = {
// ... other configurations
moduleNameMapper: {
'^vue-i18n$': 'vue-i18n/dist/vue-i18n.cjs.js'
}
};


Finally, update your Vue component to import and use vueI18n:


import { createApp } from 'vue';
import { createI18n } from 'vue-i18n';

app.use(i18n);
app.mount('#app');


Solution 2: Mocking vueI18n in JEST 27

If you encounter issues with vueI18n not being properly mocked in JEST 27, you can manually mock it in your test files.

Create a __mocks__ directory in your project’s root directory if it doesn’t exist already. Inside the __mocks__ directory, create a file named vue-i18n.js with the following content:


export const createI18n = jest.fn().mockReturnValue({
t: jest.fn().mockImplementation((key) => key),
tc: jest.fn().mockImplementation((key) => key),
te: jest.fn().mockImplementation((key) => key),
d: jest.fn().mockImplementation((key) => key),
n: jest.fn().mockImplementation((key) => key),
locale: 'en',
messages: {
en: {
// Your translation messages
}
}
});


Now, in your test files, import the mocked vueI18n and use it in your tests:


import { createI18n } from 'vue-i18n';

// Your test code


By manually mocking vueI18n, you can ensure that it behaves as expected in your tests.

With these solutions, you should be able to resolve vueI18n configuration problems when using Vue 3 and JEST 27.