Function resolveDevEnvironmentOptions

packages/vite/src/node/config.ts:903–931

(
  dev: DevEnvironmentOptions | undefined,
  environmentName: string | undefined,
  consumer: 'client' | 'server' | undefined,
  // Backward compatibility
  preTransformRequest?: boolean,
)

} satisfies UserConfig)

export function resolveDevEnvironmentOptions(
  dev: DevEnvironmentOptions | undefined,
  environmentName: string | undefined,
  consumer: 'client' | 'server' | undefined,
  // Backward compatibility
  preTransformRequest?: boolean,
): ResolvedDevEnvironmentOptions {
  const resolved = mergeWithDefaults(
    {
      ...configDefaults.dev,
      sourcemapIgnoreList: isInNodeModules,
      preTransformRequests: preTransformRequest ?? consumer === 'client',
      createEnvironment:
        environmentName === 'client'
          ? defaultCreateClientDevEnvironment
          : defaultCreateDevEnvironment,
      recoverable: consumer === 'client',
      moduleRunnerTransform: consumer === 'server',
    },
    dev ?? {},
  )
  return {
    ...resolved,
    sourcemapIgnoreList:
      resolved.sourcemapIgnoreList === false
        ? () => false
        : resolved.sourcemapIgnoreList,
  }
}

function resolveEnvironmentOptions(
  options: EnvironmentOptions,