pnpm/config/normalize-registries/src/index.ts

import type { Registries } from '@pnpm/types'
import normalizeRegistryUrl from 'normalize-registry-url'
import { map as mapValues } from 'ramda'

export const DEFAULT_REGISTRIES: Registries = {
  default: 'https://registry.npmjs.org/',
  '@jsr': 'https://npm.jsr.io/',
}

export function normalizeRegistries (registries?: Record<string, string>): Registries {
  if (registries == null) return DEFAULT_REGISTRIES
  const normalizeRegistries = mapValues(normalizeRegistryUrl, registries)
  return {
    ...DEFAULT_REGISTRIES,
    ...normalizeRegistries,
  }
}