Breaking changes in Vitest 0.34

[wxh06]

Vitest introduced a few breaking changes in 0.34.0: https://github.com/vitest-dev/vitest/releases/tag/v0.34.0

Simply upgrading Vitest to 0.34 in generated project will cause error TS2345 in vitest.config.ts:

Argument of type 'UserConfig & Promise<UserConfig> & UserConfigFnObject & UserConfigExport' is not assignable to parameter of type 'never'.
  Type 'UserConfig & Promise<UserConfig> & UserConfigFnObject' is not assignable to type 'never'.

Here's my workaround (not pretty at all):

-import { mergeConfig, defineConfig } from 'vite'
+import { mergeConfig, defineConfig, UserConfig } from 'vite'

-export default mergeConfig(
+export default mergeConfig<UserConfig, UserConfig>(

Then I got TS2769 due to the breaking change of transformMode mentioned in Vitest 0.34.0 changelog:

No overload matches this call.
  The last overload gave the following error.

Hopefully, someone can help update Vitest to 0.34

[btea]

Seems to be updated on #323.

[haoqunjiang]

Both errors are caused by transformMode. Please remove that from your vitest.config.ts. It's no longer needed in Vitest 0.34.

[CyberT33N]

// ==== DEPENDENCIES ====
import {
     defineConfig, mergeConfig,
     type ViteUserConfig
} from 'vitest/config'

// 🔌 Import the base Vitest configuration
import vitestConfig from './vitest.config'

// 📋 Define the unit test configuration
const cfg: ViteUserConfig = defineConfig({
     test: {
         /** 
          * Specifies the test files to include.
          * @type {Array<string>}
          */
         include: ['test/unit/**/*.test.ts'],

         /** 
          * Specifies the setup file to use.
          * @type {string}
          */
         setupFiles: 'test/unit/pretestEach.ts',

         /** 
          * Specifies the coverage configuration.
          * @type {Object}
          */
         coverage: {
             /** 
              * Specifies the coverage provider to use.
              * @type {string}
              */
             provider: 'v8',

             /**
              * Specifies the files or directories to exclude from coverage.
              * @type {Array<string>}
              */
             exclude: ['src/controllers/']
         }
     }
})

/**
 * 🛠️ Merges the existing Vitest configuration with additional custom 
 * configurations defined below.
 */
const mergedCfg = mergeConfig(vitestConfig, defineConfig(cfg))
export default mergedCfg