Function initialize

packages/next/src/client/index.tsx:190–290

(opts: { devClient?: any } = {})

}

export async function initialize(opts: { devClient?: any } = {}): Promise<{
  assetPrefix: string
}> {
  // This makes sure this specific lines are removed in production
  if (process.env.NODE_ENV === 'development') {
    tracer.onSpanEnd(
      (
        require('./tracing/report-to-socket') as typeof import('./tracing/report-to-socket')
      ).default
    )
    devClient = opts.devClient
  }

  initialData = JSON.parse(
    document.getElementById('__NEXT_DATA__')!.textContent!
  )
  window.__NEXT_DATA__ = initialData

  defaultLocale = initialData.defaultLocale
  const prefix: string = initialData.assetPrefix || ''
  // With dynamic assetPrefix it's no longer possible to set assetPrefix at the build time
  // So, this is how we do it in the client side at runtime
  ;(self as any).__next_set_public_path__(`${prefix}/_next/`)

  asPath = getURL()

  // make sure not to attempt stripping basePath for 404s
  if (hasBasePath(asPath)) {
    asPath = removeBasePath(asPath)
  }

  if (process.env.__NEXT_I18N_SUPPORT) {
    const { normalizeLocalePath } =
      require('../shared/lib/i18n/normalize-locale-path') as typeof import('../shared/lib/i18n/normalize-locale-path')

    const { detectDomainLocale } =
      require('../shared/lib/i18n/detect-domain-locale') as typeof import('../shared/lib/i18n/detect-domain-locale')

    const { parseRelativeUrl } =
      require('../shared/lib/router/utils/parse-relative-url') as typeof import('../shared/lib/router/utils/parse-relative-url')

    const { formatUrl } =
      require('../shared/lib/router/utils/format-url') as typeof import('../shared/lib/router/utils/format-url')

    if (initialData.locales) {
      const parsedAs = parseRelativeUrl(asPath)
      const localePathResult = normalizeLocalePath(
        parsedAs.pathname,
        initialData.locales
      )

      if (localePathResult.detectedLocale) {
        parsedAs.pathname = localePathResult.pathname
        asPath = formatUrl(parsedAs)
      } else {
        // derive the default locale if it wasn't detected in the asPath
        // since we don't prerender static pages with all possible default
        // locales