// The one place this module reads `window.__rg`, and the one place that says
// something useful when it is not there.
//
// Every shim beside this file, and `src/core.js`, go through here. That is not
// tidiness — it removes an ordering dependency that was genuinely fragile. ES
// modules evaluate dependencies in the source order of their import statements,
// so "put the friendly check in the file that is imported first" is a guarantee
// that survives exactly until someone sorts the imports. Whichever module the
// bundler happens to reach first, it reaches `window.__rg` through this.
//
// A missing global means core did not publish its shared dependencies before
// this chunk evaluated: an injection or ordering fault in CORE (MODULE_API.md
// §3.1), not a fault in this module. Without this, the first symptom is
// "Cannot read properties of undefined (reading 'react')" thrown from a file
// called react.js, which reads like the module bundled React wrong — the
// opposite of what happened.
export function rg() {
  const shared = window.__rg
  if (!shared) {
    throw new Error(
      '[module-uo] window.__rg is missing — core did not publish its shared dependencies before this ' +
      'chunk evaluated. That is an injection or ordering fault in core (MODULE_API.md §3.1), not a ' +
      'fault in this module.',
    )
  }
  return shared
}

export default rg