Function resolveConfig

packages/vite/src/node/config.ts:1395–2222

(
  inlineConfig: InlineConfig,
  command: 'build' | 'serve',
  defaultMode = 'development',
  defaultNodeEnv = 'development',
  isPreview = false,
  /** @internal */
  patchConfig: ((config: ResolvedConfig) => void) | undefined = undefined,
  /** @internal */
  patchPlugins: ((resolvedPlugins: Plugin[]) => void) | undefined = undefined,
)

}

export async function resolveConfig(
  inlineConfig: InlineConfig,
  command: 'build' | 'serve',
  defaultMode = 'development',
  defaultNodeEnv = 'development',
  isPreview = false,
  /** @internal */
  patchConfig: ((config: ResolvedConfig) => void) | undefined = undefined,
  /** @internal */
  patchPlugins: ((resolvedPlugins: Plugin[]) => void) | undefined = undefined,
): Promise<ResolvedConfig> {
  let config = inlineConfig
  config.build ??= {}
  setupRollupOptionCompat(config.build, 'build')
  config.worker ??= {}
  setupRollupOptionCompat(config.worker, 'worker')
  config.optimizeDeps ??= {}
  setupRollupOptionCompat(config.optimizeDeps, 'optimizeDeps')
  if (config.ssr) {
    config.ssr.optimizeDeps ??= {}
    setupRollupOptionCompat(config.ssr.optimizeDeps, 'ssr.optimizeDeps')
  }

  let configFileDependencies: string[] = []
  let mode = inlineConfig.mode || defaultMode
  // When `NODE_ENV` isn't set locally, ask Vite Task for it; the runner
  // also records the env in the build's cache key.
  if (process.env.NODE_ENV === undefined) {
    const nodeEnv = getEnv('NODE_ENV')
    if (nodeEnv !== undefined) {
      process.env.NODE_ENV = nodeEnv
    }
  }
  const isNodeEnvSet = !!process.env.NODE_ENV
  const packageCache: PackageCache = new Map()

  // some dependencies e.g. @vue/compiler-* relies on NODE_ENV for getting
  // production-specific behavior, so set it early on
  if (!isNodeEnvSet) {
    process.env.NODE_ENV = defaultNodeEnv
  }

  const configEnv: ConfigEnv = {
    mode,
    command,
    isSsrBuild: command === 'build' && !!config.build?.ssr,
    isPreview,
  }

  let { configFile } = config
  if (configFile !== false) {
    const loadResult = await loadConfigFromFile(
      configEnv,
      configFile,
      config.root,
      config.logLevel,
      config.customLogger,
      config.configLoader,