Function injectSsrFlag

packages/vite/src/node/build.ts:1510–1542

(
  options: T | undefined,
  environment: Environment,
  pluginName: string,
)

}

function injectSsrFlag<T extends Record<string, any>>(
  options: T | undefined,
  environment: Environment,
  pluginName: string,
): T & { ssr?: boolean } {
  let ssr = environment.config.consumer === 'server'
  const newOptions = { ...(options ?? {}), ssr } as T & {
    ssr?: boolean
  }

  if (
    isFutureDeprecationEnabled(
      environment?.getTopLevelConfig(),
      'removePluginHookSsrArgument',
    )
  ) {
    Object.defineProperty(newOptions, 'ssr', {
      get() {
        warnFutureDeprecation(
          environment?.getTopLevelConfig(),
          'removePluginHookSsrArgument',
          `Used in plugin "${pluginName}".`,
        )
        return ssr
      },
      set(v) {
        ssr = v
      },
    })
  }

  return newOptions
}

/*
  The following functions are copied from rollup