Function resolveBuildEnvironmentOptions

packages/vite/src/node/build.ts:426–513

(
  raw: BuildEnvironmentOptions,
  logger: Logger,
  consumer: 'client' | 'server' | undefined,
  isBundledDev: boolean,
  isSsrTargetWebworkerEnvironment?: boolean,
)

> = _buildEnvironmentOptionsDefaults

export function resolveBuildEnvironmentOptions(
  raw: BuildEnvironmentOptions,
  logger: Logger,
  consumer: 'client' | 'server' | undefined,
  isBundledDev: boolean,
  isSsrTargetWebworkerEnvironment?: boolean,
): ResolvedBuildEnvironmentOptions {
  const deprecatedPolyfillModulePreload = raw.polyfillModulePreload
  const { polyfillModulePreload, ...rest } = raw
  raw = rest
  if (deprecatedPolyfillModulePreload !== undefined) {
    logger.warn(
      'polyfillModulePreload is deprecated. Use modulePreload.polyfill instead.',
    )
  }
  if (
    deprecatedPolyfillModulePreload === false &&
    raw.modulePreload === undefined
  ) {
    raw.modulePreload = { polyfill: false }
  }

  const merged = mergeWithDefaults(
    {
      ..._buildEnvironmentOptionsDefaults,
      cssCodeSplit: !raw.lib,
      minify: consumer === 'server' || isBundledDev ? false : 'oxc',
      rollupOptions: {},
      rolldownOptions: undefined,
      ssr: consumer === 'server',
      emitAssets: consumer === 'client',
      createEnvironment: (name, config) => new BuildEnvironment(name, config),
    } satisfies BuildEnvironmentOptions,
    raw,
  )
  setupRollupOptionCompat(merged, 'build')
  merged.rolldownOptions = {
    platform:
      consumer === 'client' || isSsrTargetWebworkerEnvironment
        ? 'browser'
        : 'node',
    ...merged.rolldownOptions,
  }

  // handle special build targets
  if (merged.target === 'baseline-widely-available') {
    merged.target = ESBUILD_BASELINE_WIDELY_AVAILABLE_TARGET
  }
  // dedupe target
  if (Array.isArray(merged.target)) {
    // esbuild allowed duplicate targets but oxc does not
    merged.target = unique(merged.target)
  }

  // normalize false string into actual false
  if ((merged.minify as string) === 'false') {
    merged.minify = false
  } else if (merged.minify === true) {