Vitek - Uncaught ReferenceError: Document Is Not Defined

Why am I encountering an error when trying to use File in my vitest code, even though I can typically use it anywhere else? How can I fix this issue?

This is the content of my vite.config.ts.

/// <reference types="vitest" />
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

// Configure Vitest (https://vitest.dev/config/)
export default defineConfig({
  test: {
    /* for example, use global to avoid globals imports (describe, test, expect): */
    // globals: true,
  },
  plugins: [vue()],
})

Below is the code from my test file.

import { assert, expect, test } from 'vitest'

test('File', () => {
  let applicationZip = new File(new Array<Blob>(), "Mock.zip", { type: 'application/zip' })
})

After executing vitest, I receive the following error message.

ReferenceError: File is not defined
 ❯ test/basic.test.ts:25:23
     23| 
     24| test('File', () => {
     25|   let applicationZip = new File(new Array<Blob>(), "Mock.zip", { type: 'application/zip' })
       |                       ^
     26| })
     27| 

Answer №1

After stumbling upon this thread, it became clear to me that the File object is not available in Node.js but rather comes from the browser's DOM. This realization helped me understand the error I was encountering with vitest, a tool designed for pure node environments. Fortunately, after delving deeper into vitest's documentation, I learned that it can be configured with an environment like jsdom, which includes the necessary File object for testing purposes. By updating my vite.config.ts file with the appropriate environment setting, I was able to resolve the error once and for all.

/// <reference types="vitest" />
import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'

export default defineConfig({
  plugins: [vue()],
  test: {
    globals: true,
    environment: "jsdom",
  },
  root: ".",
})

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