Function run

packages/vitest/src/runtime/runVmTests.ts:25–130

(
  method: 'run' | 'collect',
  files: FileSpecification[],
  config: SerializedConfig,
  moduleRunner: TestModuleRunner,
  traces: Traces,
)

import { getWorkerState } from './utils'

export async function run(
  method: 'run' | 'collect',
  files: FileSpecification[],
  config: SerializedConfig,
  moduleRunner: TestModuleRunner,
  traces: Traces,
): Promise<void> {
  const workerState = getWorkerState()

  await traces.$('vitest.runtime.global_env', () => setupCommonEnv(config))

  Object.defineProperty(globalThis, '__vitest_index__', {
    value: VitestIndex,
    enumerable: false,
  })

  const viteEnvironment = workerState.environment.viteEnvironment || workerState.environment.name
  VitestIndex.expect.setState({
    environment: workerState.environment.name,
  })
  if (viteEnvironment === 'client') {
    const _require = createRequire(import.meta.url)
    // always mock "required" `css` files, because we cannot process them
    _require.extensions['.css'] = resolveCss
    _require.extensions['.scss'] = resolveCss
    _require.extensions['.sass'] = resolveCss
    _require.extensions['.less'] = resolveCss
    // since we are using Vite, we can assume how these will be resolved
    KNOWN_ASSET_TYPES.forEach((type) => {
      _require.extensions[`.${type}`] = resolveAsset
    })
    process.env.SSR = ''
  }
  else {
    process.env.SSR = '1'
  }

  // @ts-expect-error not typed global for patched timers
  globalThis.__vitest_required__ = {
    util,
    timers,
    timersPromises,
  }

  await traces.$('vitest.runtime.coverage.start', () => startCoverageInsideWorker(config.coverage, moduleRunner, { isolate: false }))

  if (config.chaiConfig) {
    setupChaiConfig(config.chaiConfig)
  }

  const [testRunner, snapshotEnvironment] = await Promise.all([
    traces.$('vitest.runtime.runner', () => resolveTestRunner(config, moduleRunner, traces)),
    traces.$('vitest.runtime.snapshot.environment', () => resolveSnapshotEnvironment(config, moduleRunner)),
  ])

  config.snapshotOptions.snapshotEnvironment = snapshotEnvironment

  workerState.onCancel((reason) => {