Function createWorkerPlugins

packages/vite/src/node/config.ts:1827–1894

(bundleChain: string[])

  }

  const createWorkerPlugins = async function (bundleChain: string[]) {
    // Some plugins that aren't intended to work in the bundling of workers (doing post-processing at build time for example).
    // And Plugins may also have cached that could be corrupted by being used in these extra rollup calls.
    // So we need to separate the worker plugin from the plugin that vite needs to run.
    const rawWorkerUserPlugins = (
      await asyncFlatten(createUserWorkerPlugins?.() || [])
    ).filter(filterPlugin)

    // resolve worker
    let workerConfig = mergeConfig({}, config)
    const [workerPrePlugins, workerNormalPlugins, workerPostPlugins] =
      sortUserPlugins(rawWorkerUserPlugins)

    // run config hooks
    const workerUserPlugins = [
      ...workerPrePlugins,
      ...workerNormalPlugins,
      ...workerPostPlugins,
    ]
    workerConfig = await runConfigHook(
      workerConfig,
      workerUserPlugins,
      configEnv,
    )

    const workerResolved: ResolvedConfig = {
      ...workerConfig,
      ...resolved,
      isWorker: true,
      mainConfig: resolved,
      bundleChain,
    }

    // Plugins resolution needs the resolved config (minus plugins) so we need to mutate here
    ;(workerResolved.plugins as Plugin[]) = await resolvePlugins(
      workerResolved,
      workerPrePlugins,
      workerNormalPlugins,
      workerPostPlugins,
    )

    // run configResolved hooks
    await Promise.all(
      createPluginHookUtils(workerResolved.plugins)
        .getSortedPluginHooks('configResolved')
        .map((hook) => hook.call(resolvedConfigContext, workerResolved)),
    )

    // Resolve environment plugins after configResolved because there are
    // downstream projects modifying the plugins in it. This may change
    // once the ecosystem is ready.
    // During Build the client environment is used to bundle the worker
    // Avoid overriding the mainConfig (resolved.environments.client)
    ;(workerResolved.environments as Record<
      string,
      ResolvedEnvironmentOptions
    >) = {
      ...workerResolved.environments,